Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 260 results
  • Acoustic and mechanical properties of recycled polyvinyl chloride/ground tyre rubber composites

     Colom Fajula, Xavier; Cañavate Avila, Francisco Javier; Carrillo Navarrete, Fernando; Lis Arias, Manuel Jose
    Journal of composite materials
    Vol. 48, num. 9, p. 1061-1069
    DOI: 10.1177/0021998313482154
    Date of publication: 2014-04-01
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    In order to provide another way of reducing the stock of used tyres and polyvinyl chloride waste, a new material is developed and studied. Formulation includes a matrix constituted by a compound of recycled polyvinyl chloride with plasticized polyvinyl chloride and a reinforcement of ground tyre rubber. Acoustic and mechanical properties of different compositions of polyvinyl chloride/ground tyre rubber were tested in order to determine their suitability for applications fulfilling industry requirements. Sound absorption has been analyzed, showing interesting results at frequencies higher than 2500 Hz. The obtained values are found to be depending on the thickness of the sample, the content of the ground tyre rubber and the existence of gaps, pores and voids either between layers or in the interphase between the matrix and reinforcement. From the study of the mechanical properties, we may observe that the ground tyre rubber act as filler, improving stiffness of polyvinyl chloride/ground tyre rubber composites with an increase of Young Modulus. The tensile strength, elongation at break and toughness decrease slowly. The decrease of these mechanical properties is observed to be lower than in the case of composites made by using high-density polyethylene as a matrix.

    In order to provide another way of reducing the stock of used tyres and polyvinyl chloride waste, a new material is developed and studied. Formulation includes a matrix constituted by a compound of recycled polyvinyl chloride with plasticized polyvinyl chloride and a reinforcement of ground tyre rubber. Acoustic and mechanical properties of different compositions of polyvinyl chloride/ground tyre rubber were tested in order to determine their suitability for applications fulfilling industry requirements. Sound absorption has been analyzed, showing interesting results at frequencies higher than 2500¿Hz. The obtained values are found to be depending on the thickness of the sample, the content of the ground tyre rubber and the existence of gaps, pores and voids either between layers or in the interphase between the matrix and reinforcement. From the study of the mechanical properties, we may observe that the ground tyre rubber act as filler, improving stiffness of polyvinyl chloride/ground tyre rubber composites with an increase of Young Modulus. The tensile strength, elongation at break and toughness decrease slowly. The decrease of these mechanical properties is observed to be lower than in the case of composites made by using high-density polyethylene as a matrix.

  • Comparative study of elastomeric and biogenic waste composite materials

     Colom Fajula, Xavier; Cañavate Avila, Francisco Javier; Rahhali, Ahmed; Macanás de Benito, Jorge; Carrillo Navarrete, Fernando
    Annual International Conference on Composites/Nano Enginnering
    p. 75-77
    Presentation's date: 2014-07-17
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Postprint (author’s final draft)

  • Biocomposites using waste whole chicken feathers and thermoplastic matrices

     Carrillo Navarrete, Fernando; Rahhali, Ahmed; Cañavate Avila, Francisco Javier; Colom Fajula, Xavier
    Journal of reinforced plastics and composites
    Vol. 32, num. 19, p. 1419-1429
    DOI: 10.1177/0731684413500546
    Date of publication: 2013-10
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This study deals with the preparation and characterization of thermoplastic composites using polypropylene, high-density polyethylene and polylactic acid matrices and including whole chicken feathers as reinforcement. The behaviour of the composites was determined in terms of physical and mechanical properties, which were related to the fibre¿matrix compatibility analysed by Fourier transform infrared spectroscopy and scanning electron microscopy. The results showed that the addition of chicken feathers into the thermoplastic matrices results in a slight increase in the stiffness when small amounts of chicken feathers (5¿10% vol/vol) were incorporated into the composites. Tensile strength at maximum load, elongation at break and toughness properties decreased when the chicken feather concentration was increased. Results for chicken feather¿polypropylene composites were analogous to chicken feather¿high-density polyethylene and chicken feather¿polylactic acid composites. The Fourier transform infrared spectroscopic study and the scanning electron micrographs suggest that the insufficient compatibility of chicken feather and polymer matrices is the main reason for the decrease in tensile properties

    This study deals with the preparation and characterization of thermoplastic composites using polypropylene, high-density polyethylene and polylactic acid matrices and including whole chicken feathers as reinforcement. The behaviour of the composites was determined in terms of physical and mechanical properties, which were related to the fibre–matrix compatibility analysed by Fourier transform infrared spectroscopy and scanning electron microscopy. The results showed that the addition of chicken feathers into the thermoplastic matrices results in a slight increase in the stiffness when small amounts of chicken feathers (5–10% vol/vol) were incorporated into the composites. Tensile strength at maximum load, elongation at break and toughness properties decreased when the chicken feather concentration was increased. Results for chicken feather–polypropylene composites were analogous to chicken feather–high-density polyethylene and chicken feather–polylactic acid composites. The Fourier transform infrared spectroscopic study and the scanning electron micrographs suggest that the insufficient compatibility of chicken feather and polymer matrices is the main reason for the decrease in tensile properties

  • Development of new materials including ground tyre rubber

     Cañavate Avila, Francisco Javier; Casas Carné, M. del Pilar; Carrillo Navarrete, Fernando; Colom Fajula, Xavier
    International Conference on Rubber & Rubber-Like Materials
    p. 25-26
    Presentation's date: 2013-03-07
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • A new approach of chicken feathers thermoplastic composites

     Colom Fajula, Xavier; Rahalli, Ahmmed; Cañavate Avila, Francisco Javier; Carrillo Navarrete, Fernando
    Frontiers in Polymer Science
    Presentation's date: 2013-05-22
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    In order to achieve a suitable and useful composite material, one of the most important aspects is the study of its behavior in terms of mechanical properties and in terms of its dimensional stability. This study is aimed to the analysis and characterization of composites based on thermoplastics (EVA, PP and HDPE) including chicken feathers (CFs). Several composite samples with a content of 20% of CFs have been characterized and the results have shown that: the addition of micronized chicken feather to different matrices in small-middle quantities as a filler, improves the stiffness and provides a more brittle behavior and Ethylene Vinyl Acetate (EVA) matrix shows better mechanical properties because of the ability to interact with chicken feather, thus providing better tensile properties (tensile strength and toughness) than polyolephinic matrix FTIR spectroscopy analysis show that few interactions appear between polyolephinic matrices and CF¿s reinforcement and carbonyl group of acetate matrix component (EVA), interacts with amine group assigned to CFs reinforcement, improving the ability to establish a link between the material¿s components. SEM micrographs show differences depending on the matrix used. Chemical composition in EVA defines suitable conditions to create chemical interactions and improve the compatibility with chicken feather. The fracture surfaces indicate that there is interfacial adhesion of the matrix to the chicken feather particles due mainly to the described interaction of the carbonyl group of acetate component of matrix and amine group of keratin constituent of feather. On the other hand SEM microphotographs show that polyolefinic matrices don¿t seem to achieve a good compatibility with CF. The results obtained for mechanical properties are justified in the light of these considerations.

  • XV Premios Nacionales de Ediciones Universitarias

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol; Colom Fajula, Xavier; Marin Genesca, Marcos
    Award or recognition

    View View Open in new window  Share

  • Dielectric, mechanical, and thermal characterization of high-density polyethylene composites with ground tire rubber

     Mujal Rosas, Ramon Maria; Marin Genesca, Marcos; Òrrit Prat, Jordi; Rahhali, Ahmed; Colom Fajula, Xavier
    Journal of thermoplastic composite materials
    Vol. 25, num. 5, p. 537-559
    DOI: 10.1177/0892705711411344
    Date of publication: 2012-07-25
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The mass manufacture of tires and the difficulty in storing or disposing them constitute a serious environmental problem. At present, various recycling methods for tires are used, such as grinding, which separates the steel and fibers from the vulcanized rubber, then using the rubber in numerous industrial applications such as pavements, insulators, footwear, etc. The aim of this article focuses on finding a new application for the ground tire rubber (GTR). This would allow including GTR in industrial applications of recycled high-density polythene (HDPE). Tire dust and HDPE thermoplastic have been mixed, and the maximum accepted values of GTR concentration that can be admitted while keeping dielectric, mechanical, and thermal properties within acceptable values, as well as initial polymer microstructure, have been checked. In addition, the suitability of the compounds for antistatic applications is studied. The recycled tire dust which results from the industrial milling processes has been divided by sieve in three different categories according to the size of the particles (<200, 200–500, and >500 mm). This has then been mixed with HDPE in different GTR concentrations (0%, 5%, 10%, 20%, 40%, 50%, and 70%) in order to establish its conduct through electrical, mechanical, thermal, and microstructure tests, which will be held in a temperature range 30–120_C, and with a frequency range 1 _ 10_2 and 3 _ 106 Hz. The thermal tests determined the enthalpies and fusion temperatures which allow for the observation of changes in crystalline and microstructure of the matrix, and finally, the fracture surfaces of the compound samples have been evaluated using scanning electron microscopy

  • Use of chicken feathers waste for the fabrication of composite materials

     Carrillo Navarrete, Fernando; Macanás de Benito, Jorge; Colom Fajula, Xavier; Cañavate Avila, Francisco Javier; Molins Duran, Gemma; Alvarez Del Castillo, M. Dolores; Garrido Soriano, Nuria
    European Conference on Composite Materials
    p. 1-8
    Presentation's date: 2012-06-26
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Composites from keratin biofibers. Study of compatibility using polyolephinic matrices

     Carrillo Navarrete, Fernando; Rahalli, Ahmed; Cañavate Avila, Francisco Javier; Colom Fajula, Xavier
    European Conference on Composite Materials
    Presentation's date: 2012-06-25
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The study deals with the analysis and characterization of chicken feathers (CFs) based thermoplastic composites. The performance of the composite has been characterized in terms of mechanical properties which have been related to the fibre-matrix compatibility of the composite components analyzed by FTIR and SEM. The results have shown that the addition of short CFs as a filler to the PP thermoplastic matrix did not significantly improve the mechanical properties. A slightly increase of the stiffness has been observed when using small quantities of CFs (5-10% v/v) that provides to the composites a more brittle behaviour. Analogous behaviour has been observed for HDPE/CFs composites. FTIR spectroscopy and SEM micrographs analyses show limited compatibility between the composite components (CFs and polyolephinic matrices)

  • La encuesta al alumnado en la evaluación de la actividad docente del profesorado

     Garcia-berro Montilla, Enrique; Colom Fajula, Xavier; Martínez Solanas, Èrica; Sallarés González Novelles, Jordi; Roca Martín, Santiago
    Aula Abierta
    Vol. 39, num. 3, p. 3-14
    Date of publication: 2011-09
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Efecto de pretratamientos desvulcanizantes y de aditivos en materiales compuestos con matriz de HDPE y neumáticos fuera de usi

     Cañavate Avila, Francisco Javier; Casas Carné, M. del Pilar; Colom Fajula, Xavier; Jeanbon, Marine; Carrillo Navarrete, Fernando; Nogues Morell, Francisco
    Afinidad: revista de química teórica y aplicada
    Vol. 68, num. 551, p. 25-32
    Date of publication: 2011-02
    Journal article

     Share Reference managers Reference managers Open in new window

  • Dielectric and mechanical characterization of PVC composites with ground tire rubber

     Òrrit Prat, Jordi; Mujal Rosas, Ramon Maria; Rahhali, A.; Marin Genesca, Marcos; Colom Fajula, Xavier; Belana Punseti, Juan
    Journal of composite materials
    Vol. 45, num. 11, p. 1233-1243
    DOI: 10.1177/0021998310380289
    Date of publication: 2011-06
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The mass manufacture of tires and the difficulty for their elimination or storage constitutes a serious environmental problem. At present, several methods for the recycling of tires are used, such as mechanical crushing, in which the steel vulcanized rubber and the fibers are separated; this rubber is being used in numerous applications like pavements, insulators, footwear, etc. This study proposes a second option for obsolete tires, demonstrating their utility as dielectrics. In order to do so, ground tire rubber (GTR) has been combined with polyvinyl chloride (PVC), to obtain a composite of a polymeric matrix reinforced with GTR. In order to determine the behavior of this composite material, the electrical and mechanical tests are presented as well as, more briefly, microstructure and thermal analyses, undertaken for the various mixtures of PVC with GTR (concentrations of 0%, 5%, 10%, 20%, 40%, 50%, and 70% GTR), and three GTR particle size categories (<200 mm, 200–500 mm, and >500 mm), in a range of temperatures that varied from 30 C to 130 C, and with frequencies from between 1 10 2 Hz and 3 106 Hz. The dielectric tests have allowed for an analysis of dielectric constant, dielectric loss factor, dielectric modulus, etc. On the other hand, the mechanical analysis has involved the Young’s modulus, tensile strength, elongation at break, and toughness. Mechanical and dielectric results point out that below 20% of GTR the material features for mechanical or electrical applications are not significantly altered.

  • Thermoplastic elastomers including ground tyre rubber in a thermoplastic matrix

     Cañavate Avila, Francisco Javier; Casas Carné, M. del Pilar; Carrillo Navarrete, Fernando; Nogues Morell, Francisco; Colom Fajula, Xavier
    World Journal of Engineering
    Vol. 8, num. 2, p. 165-170
    DOI: 10.1260/1708-5284.8.2.165
    Date of publication: 2011-06-15
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Disposal of end of life tyres is regulated in many countries. The enormous amount produced every year needs the research of new ways of recycling. A common practice previous to any treatment is the grinding of the tyres by specialized companies producing ground tyre rubber powder. Several attempts to include this powder in polymeric matrixes have been developed, mainly resulting in a lack of compatibility of the components. In this paper we propose a new composite including GTR and EPDM in a HDPE matrix. The use of peroxides to produce crosslinking produces a thermoelastomeric material suitable for industrial applications.

  • Formulations for thermoplastic vulcanizates based on high density polyethylene, ethylene-propylene-diene monomer, and ground tyre rubber

     Cañavate Avila, Francisco Javier; Casas Carné, M. del Pilar; Colom Fajula, Xavier; Nogues Morell, Francisco
    Journal of composite materials
    Vol. 45, num. 11, p. 1189-1200
    DOI: 10.1177/0021998310369596
    Date of publication: 2011-06
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • La química i la societat

     Grau Vilalta, Maria Dolors; Font Soldevila, Jose; Sanz Balague, Joaquim; Guaus Guerrero, Ester; Calvet Tarragona, Aurelio; Salán Ballesteros, Mª Núria; Martínez Martínez, María R.; Farran Marsa, Adriana; Gorchs Altarriba, Roser; Alvarez Del Castillo, M. Dolores; Garrido Soriano, Nuria; Morillo Cazorla, Margarita; Almajano Pablos, Maria Pilar; Cardona Planes, Anna Maria; Macanás de Benito, Jorge; Bonsfills Pedros, Ana; Gamisans Noguera, Javier; Dorado Castaño, Antonio David; Lao Luque, Concepcion; Torrent Burgues, Juan; Molins Duran, Gemma; Colom Fajula, Xavier; Carrillo Navarrete, Fernando; Ramon Portés, Eva; Garriga Sole, Pere; Sole Sardans, M. Montserrat; Ardanuy Raso, Monica; Pares Sabates, Ferran; Roncero Vivero, Maria Blanca; Cusola Aumedes, Oriol
    Collaboration in exhibitions

     Share

  • APROVECHAMIENTO RESIDUOS QUERATINICOS COMO FIBRAS REFUERZO BIODEGRADABLES OBTENCION MATERIALES COMPUESTOS RESPETUOSOS MEDIO AMBIENTE

     Colom Fajula, Xavier; Cañavate Avila, Francisco Javier; Alvarez Del Castillo, M. Dolores; Molins Duran, Gemma; Garrido Soriano, Nuria; Macanás de Benito, Jorge; Carrillo Navarrete, Fernando
    Competitive project

     Share

  • ACDC2011-00058

     Colom Fajula, Xavier
    Competitive project

     Share

  • Efecto de pretratamientos desvulcanizantes y de aditivos en materiales compuestos con matriz de HDPE y neumáticos fuera de uso

     Cañavate Avila, Francisco Javier; Casas Carné, M. del Pilar; Colom Fajula, Xavier; Jeanbon, Marine; Nogues Morell, Francisco; Carrillo Navarrete, Fernando
    Afinidad: revista de química teórica y aplicada
    Vol. 551, num. Enero-Febrero 2011, p. 25-32
    Date of publication: 2011
    Journal article

     Share Reference managers Reference managers Open in new window

  • High modulus regenerated cellulose fiber-reinforced cellulose acetate butyrate biocomposites

     Carrillo Navarrete, Fernando; Martín, G; López Mesas, Montserrat; Colom Fajula, Xavier; Cañavate Avila, Francisco Javier
    Journal of composite materials
    Vol. 45, num. 17, p. 1733-1740
    DOI: 10.1177/0021998310386261
    Date of publication: 2011-08-04
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The properties of composites prepared with a matrix of biodegradable cellulose ester (cellulose acetate butyrate, CAB) and reinforced with regenerated cellulose lyocell fibers (lyocell/CAB) were studied and compared with short flax fiberreinforced composites (flax/CAB), used as reference. The effect of the lyocell fiber content on the composite properties was also investigated. Tensile properties, dimensional stability, fiber–matrix compatibility, and biodegradability were investigated by tensile testing, water absorption test, scanning electron microscopic analysis, and soil burial test, respectively. From the results, it was shown how the Young’s modulus of lyocell/CAB composites increased from 2 GPa for neat CAB to 4 GPa for a composite with a lyocell fiber content of 34.8% (v/v). Similar trend was obtained for flax/CAB biocomposites which showed higher modulus than lyocell/CAB composites, with values of 5 GPa for a flax/CAB composite with the same composition. Moreover, tensile strength of lyocell/CAB composites with fiber content higher than 16.7% (v/v) resulted in lower values than neat CAB, indicating a high probability of failure cracks on lyocell/CAB composite samples when increasing fiber composition. In addition, compared to neat CAB, elongation at break decreased for all the composites studied. It was also observed that increasing the fiber content, the water absorption of the composites increased compared to neat CAB matrix due to the hydrophilic nature of the lyocell and flax fibers. The biodegradation test showed, after 60 days of soil burial, about 10% and 25% of mass lost for 34.8% (v/v) of lyocell/CAB and flax/CAB composites, respectively.

  • Dielectric, mechanical, and thermal characterization of high-density polyethylene composites with ground tire rubber

     Mujal Rosas, Ramon Maria; Marin Genesca, Marcos; Òrrit Prat, Jordi; Rahhali, A.; Colom Fajula, Xavier
    Journal of thermoplastic composite materials
    Vol. 25, num. 5, p. 537-559
    DOI: 10.1177/0892705711411344
    Date of publication: 2011-07-08
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The mass manufacture of tires and the difficulty in storing or disposing them constitute a serious environmental problem. At present, various recycling methods for tires are used, such as grinding, which separates the steel and fibers from the vulcanized rubber, then using the rubber in numerous industrial applications such as pavements, insulators, footwear, etc. The aim of this article focuses on finding a new application for the ground tire rubber (GTR). This would allow including GTR in industrial applications of recycled high-density polythene (HDPE). Tire dust and HDPE thermoplastic have been mixed, and the maximum accepted values of GTR concentration that can be admitted while keeping dielectric, mechanical, and thermal properties within acceptable values, as well as initial polymer microstructure, have been checked. In addition, the suitability of the compounds for antistatic applications is studied. The recycled tire dust which results from the industrial milling processes has been divided by sieve in three different categories according to the size of the particles (<200, 200–500, and >500 mm). This has then been mixed with HDPE in different GTR concentrations (0%, 5%, 10%, 20%, 40%, 50%, and 70%) in order to establish its conduct through electrical, mechanical, thermal, and microstructure tests, which will be held in a temperature range 30–120 C, and with a frequency range 1 10 2 and 3 106 Hz. The thermal tests determined the enthalpies and fusion temperatures which allow for the observation of changes in crystalline and microstructure of the matrix, and finally, the fracture surfaces of the compound samples have been evaluated using scanning electron microscopy.

  • New routes to recycle scrap tyres

     Colom Fajula, Xavier; Cañavate Avila, Francisco Javier; Casas Carné, M. del Pilar; Carrillo Navarrete, Fernando
    Date of publication: 2011-08-10
    Book chapter

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Optimal manufacturing conditions of chicken feathers/pla biocomposites

     Garrido Soriano, Nuria; Aymerich Amorós, Jordi; Colom Fajula, Xavier; Cañavate Avila, Francisco Javier; Macanás de Benito, Jorge; Alvarez Del Castillo, M. Dolores; Molins Duran, Gemma; Carrillo Navarrete, Fernando
    Mediterranean Congress of Chemical Engineering
    p. 21_045_P
    Presentation's date: 2011-11-15
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Obtención y caracterización de materiales compuestos de matriz termoplástica conteniendo residuos biodegradables de base queratínica

     Carrillo Navarrete, Fernando; Rahhali, A.; Colom Fajula, Xavier; Cañavate Avila, Francisco Javier
    Congreso Nacional de Materiales Compuestos
    p. 475-480
    Presentation's date: 2011-07-08
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Degradacion fotooxidativa de elastómeros NBR/SiO2

     Colom Fajula, Xavier; Cañavate Avila, Francisco Javier; Carrillo Navarrete, Fernando; Andreu Mateu, Francesc
    Congreso Nacional de Materiales Compuestos
    p. 113
    Presentation's date: 2011-07-08
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Utilización de neumáticos fuera de uso con pretratamiento desvulcanizante como refuerzo en materiales compuestos de matriz poliolefínica

     Cañavate Avila, Francisco Javier; Casas Carné, M. del Pilar; Jeanbon, Marine; Nogues Morell, Francisco; Carrillo Navarrete, Fernando; Colom Fajula, Xavier
    Congreso Nacional de Materiales Compuestos
    p. 157-158
    Presentation's date: 2011-07-07
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Physicochemical characterization of a valorisable waste: chicken feathers

     Macanás de Benito, Jorge; Fafián, Yolanda; Molins Duran, Gemma; Alvarez Del Castillo, M. Dolores; Colom Fajula, Xavier; Cañavate Avila, Francisco Javier; Garrido Soriano, Nuria; Carrillo Navarrete, Fernando
    Mediterranean Congress of Chemical Engineering
    p. 21_025_P
    Presentation's date: 2011-11-15
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Properties of chicken feathers based polylactic acid biocomposites

     Carrillo Navarrete, Fernando; Garrido Soriano, Nuria; Aymerich Amorós, Jordi; Colom Fajula, Xavier; Cañavate Avila, Francisco Javier; Macanás de Benito, Jorge; Alvarez Del Castillo, M. Dolores; Molins Duran, Gemma
    European and Exhibition Congress on Advanced Materials and Processes
    Presentation's date: 2011-09-13
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Propietats dielèctriques i mecàniques del polietilè d¿alta densitat (HDPE) reforçat amb pneumàtics fora d¿ús (GTR)

     Mujal Rosas, Ramon Maria; Òrrit Prat, Jordi; Marin Genesca, Marcos; Rahhali, A.; Colom Fajula, Xavier
    Afinidad: revista de química teórica y aplicada
    Vol. 67, num. 545, p. 7-13
    Date of publication: 2010-04-10
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Propiedades dieléctricas y mecánicas del polietileno de alta densidad (HDPE) reforzado con neumáticos fuera de uso (GTR)

     Mujal Rosas, Ramon Maria; Òrrit Prat, Jordi; Marin Genesca, Marcos; Rahhali, A.; Colom Fajula, Xavier
    Afinidad: revista de química teórica y aplicada
    Vol. 67, num. 545, p. 7-13
    Date of publication: 2010-02
    Journal article

     Share Reference managers Reference managers Open in new window

  • Properties of regenerated cellulose lyocell fiber-reinforced composites

     Carrillo Navarrete, Fernando; Colom Fajula, Xavier; Cañavate Avila, Francisco Javier
    Journal of reinforced plastics and composites
    Vol. 29, num. 3, p. 359-371
    DOI: 10.1177/0731684408097777
    Date of publication: 2010-02
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Acoustical and mechanical behavior of HDPE/EPDM/NFU blends

     Colom Fajula, Xavier; Pola, E.; Casas, P.; Nogues Morell, Francisco; Carrillo Navarrete, Fernando; Cañavate Avila, Francisco Javier
    Congreso Nacional de Propiedades Mecánicas de Sólidos
    p. 213-220
    Presentation's date: 2010-09-15
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • The Use of Waxes and Wetting Additives to Improve Compatibility Between HDPE and Ground Tyre Rubber

     Cañavate Avila, Francisco Javier; Carrillo Navarrete, Fernando; Casas Carné, M. del Pilar; Colom Fajula, Xavier; Suñol Martinez, Juan Jose
    Journal of composite materials
    Vol. 44, num. 10, p. 1233-1245
    DOI: 10.1177/0021998309351602
    Date of publication: 2010-05
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Study of compatibilization methods for High Density Polyethylene and Ground Tyre Rubber: exploring new routes to recycle scrap tyres  Open access

     Casas Carné, M. del Pilar
    Department of Chemical Engineering, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Cotxes, camions, tractors, avions... tots necessiten els neumàtics com a component imprescindible per al seu funcionament. Malauradament, degut al desgast per ús, els neumàtics tenen una vida útil limitada que obliga a renovar-los cada cert temps passant a ser Neumàtics Fora d'Ús (NFU). Paradògicament, els neumàtics són formulats per a suportar condicions extremes d'ús i, entre d'altres matèries primeres contenen cautxú vulcanitzat, una elevada quantitat d'estabilitzants i d'altres additius que fan dels neumàtics un material no biodegradable. Fins al 2006, era possible desar els NFU en abocadors però aquesta pràctica va ser prohibida per la Comunitat Europea (directiva 1993/31/EC). Aquesta directiva conjuntament amb la creixent consciència mediambiental ha potenciat la investigació per a trobar noves aplicacions per les 3.4milions de tones de NFU que es generen a l'any a Europa. Els NFU són emprats com a font d'energia o en aplicacions civils, però cada vegada més, són emprats en autopistes o per usos decoratius després de patir un procés de separació i trituració (NFU triturat). Les propietats físico-químiques dels NFU en fan un material molt interessant per la comunitat científica internacional que es centra en buscar noves vies de reciclatge mitjançant aplicacions d'alt valor afegit.Una opció per reciclar grans volums de NFU és utilitzar-los granulats com a càrrega en matrius termoplàstiques, encara que aquesta és una tasca difícil degut a la baixa compatibilitat entre aquests dos materials. Les seves característiques superficials són les responsables d'aquesta baixa compatibilitat. Cal afegir també que el tamany de les partícules de NFU obtingudes a partir de processos industrials és entre 400 and 600μm, sent aquest un tamany massa gran per poder ser fàcilment embolcallades per qualsevol matriu. D'altra banda, el cautxú dels neumàtics és troba altament vulcanitzat i, per tant, aquest reaccionarà químicament amb dificultats amb d'altres materials. Totes aquestes propietats fan dels NFU un material difícil de treballar-hi. La present tesis estudia diferents mètodes de compatibilització d'un Polietilè D'alta Densitat (PEAD) de grau d'injecció i NFU triturat obtingut a partir de processos estàndards de molturació. La resina de PEAD va ser escollit com a matriu degut al seu ampli rang d'aplicacions d'injecció. L'objectiu principal és explorar diferents mètodes de compatibilització d'aquests dos materials per obtenir òptimes propietats mecàniques, tèrmiques i morfològiques en aplicacions d'injecció. Els composites són optimitzats per a que continguin la màxima quantitat de NFU, una adequada transformació i el mínim cost. Després d'un estudi preliminar de composites basats en NFU i PEAD s'han estudiat tres mètodes diferents per millorar l'adhesió entre aquests dos materials. El primer mètode consisteix en oxidar la superfície de les partícules de NFU granulat amb tractament basats en àcids, amb l'objectiu de proporcionar rugositat per a un anclatge mecànic. En el segon mètode s'han emprat additius humectants i ceres, ja que aquestes substàncies redueixen la tensió interfacial entre les partícules de NFU i la matriu de PEAD. En l'últim mètode, es va estudiar la influència de l'Etilè Propilè Diè Monòmer (EPDM). Amb aquest mètode, les partícules de NFU són embolcallades per l'EPDM, aquest efecte pot ser millorat amb l'ús de peròxids. Les propietats dels "composites" són bastant diferents en funció del mètode emprat.Després d'una comparació dels "composites" obtinguts pels tres mètodes, s'ha trobat que el que conté 30% d'EPDM i dos peròxids, corresponent a la formulació:: 30% NFU + 40% PEAD + 30% EPDM + 0.5% Trigonox 311 + 0.1% Peròxid de Dicumilcompleix els objectius fixats en la tesis: bona adhesió entre les partícules de NFU i el PEAD on l'elevat valor d'elongació n'és una conseqüència directa, la seva obtenció mitjançant un procés de compatibilització de cost reduït, un nou material amb una elevada quantitat de NFU (30%), la seva facilitat de transformació,, i el més important, una nova via de reciclatge dels NFU per a una aplicació d'alt valor afegit.

    Cars, trucks, tractors, airplanes. all need tyres as essential component to work. Unfortunately, due to its continuous use, tyres suffer from wear and have a limited lifetime; therefore, they must be changed every certain time becoming end of life tyres (EOL tyres). Paradoxically tyres are formulated to withstand difficult conditions and among other raw materials, they contain vulcanizated rubbers, high amount of stabilizers and other additives that turn tyres into non biodegradable material. Until 2006, disposal of EOL tyres in landfills was a common practice but it was banned by the European Community (directive 1993/31/EC). This European legislation together with an increasing environmental consciousness has instigated researchers to find applications for 3.4million tonnes of used tyres generated per year in Europe. Some extended uses for EOL tyres are energy recover and civil applications but the use of tyres after separation and grinding processes (material know as Ground Tyre Rubber - GTR), has increased during the last decade. Physical and chemical properties of EOL tyres make them an interesting material for the international research community focused today on finding new ways to recycle tyres for value added applications. A good option to recycle big volumes of discarded tyres is using GTR particles as filler in thermoplastic matrixes, although this is a difficult task due to the low compatibility between the two materials. The surface characteristics of the GTR particles are responsible of this low compatibility. Despite these facts, the particle size obtained from standard industrial grinding processes is between 400 and 600μm. These particles are too large to be entrapped easily in polymeric matrixes. These characteristics in conjunction with the fact that GTR is made of highly crosslinked rubber with difficulties to react chemically to other materials, make GTR a material very difficult to work with.The present thesis deals with the study of different compatibilization methods for an injection moulding grade of High Density Polyethylene (HDPE) and GTR obtained from standard industrial grinding process. The HDPE resin was chosen due to its wide range of injection moulding applications. The aim is to explore different methods to mix these two materials and obtain optimum mechanical, thermal and morphological properties for injection moulding applications. The composites are optimized to obtain the highest GTR amount, adequate processability and minimum cost. After a preliminary study of the composites based on GTR and HDPE, three different methods to improve the adhesion between these two materials are studied. The first method consists in an oxidizing treatment on GTR particles surface in order to promote mechanical anchoring. In the second method the influence of wetting additives and waxes is studied. These substances reduce interfacial tension between GTR particles and HDPE matrix. The third and last method, study the influence of Ethylene Propylene Diene Monomer (EPDM) addition with and without peroxides. In this method, GTR particles are encapsulated by EPDM and this effect can be boosted by the use of peroxides. The composites properties are quite different depending on the used method.After a comparison of the composites obtained by the three different compatibilization methods, it is found that the one with 30% of EPDM plus two peroxides, corresponding to30% GTR + 40% HDPE + 30% EPDM + 0.5% Trigonox 311 + 0.1% Dicumyl Peroxidefulfil the objectives of the thesis. This composite has good adhesion between GTR and HDPE that results in high elongation, it is obtained by a cheap compatibilization process and contains a high amount of recycled tyres (30%), it is easy to process, and the most important thing, it represents a new route to recycle scrap tyres for a value added application.

  • Acoustic and mechanical properties of PVC/GTR composites

     Colom Fajula, Xavier; Cañavate Avila, Francisco Javier; Carrillo Navarrete, Fernando; Mañosa, M.; Lis Arias, Manuel Jose
    Annual International Conference on Composites/Nano Enginnering
    Presentation's date: 2010-07-04
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Thermoplastic vulcanizates based on high density polyethylene, ethylene-propylene-diene monomer and ground tyre rubber

     Cañavate Avila, Francisco Javier; Casas Carné, M. del Pilar; Carrillo Navarrete, Fernando; Nogues Morell, Francisco; Colom Fajula, Xavier
    Annual International Conference on Composites/Nano Enginnering
    Presentation's date: 2010
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Mechanical and structural characterization of three different antioxidants on the thermal oxidation process of elastomeric NBR-matrix nanocomposite materials

     Colom Fajula, Xavier; Andreu Mateu, Francesc; Carrillo Navarrete, Fernando; Cañavate Avila, Francisco Javier
    International Conference Mechanics of Composite Materials
    p. 59
    Presentation's date: 2010-05-25
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Effect of the Particle Size and Acid Pretreatments on Compatibility and Properties of Recycled HDPE Plastic Bottles Filled with Ground Tyre Powder

     Colom Fajula, Xavier; Cañavate Avila, Francisco Javier; Carrillo Navarrete, Fernando; Sunol, Jj
    Journal of applied polymer science
    Vol. 112, num. 4, p. 1882-1890
    Date of publication: 2009-02
    Journal article

     Share Reference managers Reference managers Open in new window

  • Study of the influence of IPPD on thermo-oxidation process of elastomeric hose

     Colom Fajula, Xavier; Andreu Mateu, Francesc; Cañavate Avila, Francisco Javier; Mujal Rosas, Ramon Maria; Carrillo Navarrete, Fernando
    Journal of applied polymer science
    Vol. 114, num. 4, p. 2011-2018
    DOI: 10.1002/app.30746
    Date of publication: 2009-06
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Dielectrical behaviour of composites reinforced with Ground Tire Rubber (GTR)

     Òrrit Prat, Jordi; Mujal Rosas, Ramon Maria; Nogues Morell, Francisco; Colom Fajula, Xavier
    Afinidad: revista de química teórica y aplicada
    Vol. 66, num. 542, p. 293-299
    Date of publication: 2009-07
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Thermal degradation of lyocell/poly-N-isopropylacrylamide graft copolymers gels

     Carrillo Navarrete, Fernando; Defays, Boris; Colom Fajula, Xavier; Suñol Martinez, Juan Jose; López Mesas, Montserrat
    Journal of thermal analysis and calorimetry
    Vol. 97, num. 3, p. 945-948
    DOI: 10.1007/s10973-009-0090-8
    Date of publication: 2009-09
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Behavior of the Three-Phase Induction Motor With Spiral Sheet Rotor

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol; Colom Fajula, Xavier; Rolan Blanco, Alejandro
    IEEE transactions on energy conversion
    Vol. 24, num. 1, p. 68-76
    DOI: 10.1109/TEC.2008.2005283
    Date of publication: 2009-03
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Vulcanizados termoplasticos basados en HDPE,EPDM y restos de neumáticos pulverizados

     Cañavate Avila, Francisco Javier; Casas, P.; Nogues Morell, Francisco; Carrillo Navarrete, Fernando; Colom Fajula, Xavier
    Reunión del Grupo Especializado de Polímeros
    p. 243
    Presentation's date: 2009-09-20
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Comportamiento Dielectrico en materiales compuestos PVC/NFU

     Colom Fajula, Xavier; Òrrit Prat, Jordi; Mujal Rosas, Ramon Maria; Nogues Morell, Francisco; Cañavate Avila, Francisco Javier; Carrillo Navarrete, Fernando
    Reunión del Grupo Especializado de Polímeros
    p. 180
    Presentation's date: 2009-09-21
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    Induction motor with spiral sheet rotor  Open access

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol; Colom Fajula, Xavier
    IEEE International Symposium on Industrial Electronics
    p. 529-537
    DOI: 10.1109/ISIE.2009.5219775
    Presentation's date: 2009-07-06
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    mprovements in torque at low currents using a rotor with spiral sheets are analyzed. Several rotors and stators have been built combining different constructive and mechanical characteristics of the related elements : inertias, constructive materials, geometrical shapes of the sheets and geometrical disposition of the sheets . These different types of motors have been simulated using computer aided tools and then tested in the laboratory. Finally, four stators (1000, 1500, 1500-type A, and 3000 rpm) with the same constructive parameters, have been simulated and tested with the following rotors types: solid rotor, solid rotor with diamagnetic rings, drag cup, and simple and double squirrel cage rotor; the results have been compared to those obtained with the seven variants of spiral sheet rotor presented in this paper.

  • Absorción Acústica de materiales compuestos reforzados con partículas de neumáticos fuera de uso

     Nogues Morell, Francisco; Carrillo Navarrete, Fernando; Cañavate Avila, Francisco Javier; Colom Fajula, Xavier
    Reunión del Grupo Especializado de Polímeros
    p. 173
    Presentation's date: 2009-09-20
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Dielectric properties of ground rubber tire composites

     Colom Fajula, Xavier; Mujal Rosas, Ramon Maria; Òrrit Prat, Jordi
    China-Europe Symposium on Processing and Properties of Reinforced Polymers
    p. 169
    Presentation's date: 2009-06-04
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window