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  • Muestras con melatonina. Muestras analizadas: A027-47-25ºC-6meses y A027-48-25ºC-6meses

     Morancho Llena, Jose Maria; Ramis Juan, Xavier; Salla Tarrago, Jose M.
    Date: 2014-12-18
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  • New epoxy thermosets modified with amphiphilic multiarm star polymers as toughness enhancer

     Lagunas Calpe, Carlos; Fernández Francos, Xavier; Ferrando Piera, Francesc; Flores Guillen, Marjorie; Serra Albet, Àngels; Morancho Llena, Jose Maria; Salla Tarrago, Jose M.; Ramis Juan, Xavier
    Reactive and functional polymers
    Vol. 83, p. 132-143
    DOI: 10.1016/j.reactfunctpolym.2014.07.022
    Date of publication: 2014-10-01
    Journal article

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    The synthesis and characterization of two novel amphiphilic multiarm star polymers with linear polyethylene glycol (PEG) and poly(s-caprolactone) (PCL) arms and their use as toughening modifiers of epoxy anhydride thermosets are reported. The new star polymers were obtained by partial pegylation of a hyperbranched polyester and subsequent growth of PCL arms. The curing process was studied by calorimetry and thermomechanical analysis, demonstrating the accelerating effect and the influence on gelation of the hydroxyl terminal groups. The curing kinetics was analyzed by model-free and model-fitting methods. The final properties of the resulting materials were determined by thermal and mechanical tests. The addition of the star-like modifiers led only to notable improvement on impact strength in the material containing a 10% of the star with PCL and PEG arms, without compromising glass transition temperature and thermal stability. The morphology of the resulting materials depended on the structure of the toughness modifier used, as demonstrated by electron microscopy, but all modified thermosets obtained showed phase-separated morphologies with nanosized particles. (C) 2014 Elsevier B.V. All rights reserved.

  • Muestras con melatonina. Muestras analizadas: A027-47-25ºC-3meses y A027-48-25ºC-3meses

     Morancho Llena, Jose Maria; Ramis Juan, Xavier; Salla Tarrago, Jose M.
    Date: 2014-09-18
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  • Nuevos termoestables con tenacidad mejorada a base de sistemas epoxi/anhídrido y polímeros estrella anfifílicos

     Lagunas Calpe, Carlos; Fernández Francos, Xavier; Ferrando Piera, Francesc; Flores Guillen, Marjorie; Serra Albet, Àngels; Salla Tarrago, Jose M.; Morancho Llena, Jose Maria; Ramis Juan, Xavier
    Reunión del Grupo Especializado de Polímeros
    p. 164-165
    Presentation's date: 2014-09-08
    Presentation of work at congresses

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  • Photocuring and thermal post-curing of a cycloaliphatic epoxide resin modified with a trithiol and a vinyl epoxy compound

     Morancho Llena, Jose Maria; Fernández Francos, Xavier; Ramis Juan, Xavier; Salla Tarrago, Jose M.; Serra, Àngels
    European Symposium on Thermal Analysis and Calorimetry
    p. 187
    Presentation's date: 2014-08-17
    Presentation of work at congresses

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  • Estudio IP01-0026. Muestras analizadas: 29, 30, 31, 32 y 33

     Morancho Llena, Jose Maria; Ramis Juan, Xavier; Salla Tarrago, Jose M.
    Date: 2014-07-22
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  • Muestras con melatonina. Muestras analizadas: A027-47 y A027-48

     Morancho Llena, Jose Maria; Ramis Juan, Xavier; Salla Tarrago, Jose M.
    Date: 2014-07-22
    Report

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    Los ensayos se han realizado con un calorímetro diferencial de barrido Mettler 822e (Mettler-Toledo, Schwerzenbach, Suiza). En el ensayo calorimétrico se calentó la muestra desde 25ºC hasta 150ºC a 12,5ºC/min.

  • Thermal curing and photocuring of a DGEBA modified with multiarm star poly(glycidol)-b-poly(e-caprolactone) polymers of different arm lengths

     Morancho Llena, Jose Maria; Cadenato Matia, Ana Maria; Ramis Juan, Xavier; Morell, Mireia; Fernández Francos, Xavier; Salla Tarrago, Jose M.; Serra Albet, Àngels
    Journal of thermal analysis and calorimetry
    Vol. 114, p. 409-416
    DOI: 10.1007/s10973-012-2919-9
    Date of publication: 2013-10
    Journal article

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    The influence of two multiarm star polymers, hyperbranched poly(glycidol)-b-poly(e-caprolactone) of different arm lengths, on the thermal curing and the photocuring of a diglycidyl ether of bisphenol A epoxy resin (DGEBA) is studied. Star polymer with short arms PCL-10 decelerates more the thermal curing than the polymer with long arms PCL-30 because the latter is less solubilized in the epoxy matrix and its effect on the polymerization of the resin and the thermal-mechanical properties is less important. The kinetic triplet corresponding to the thermal curing of the different formulations has been determined. In the analysis of the photocuring process, we have also found that short-arm star PCL-10 is better solubilized in the epoxy matrix and its effect on the photocuring kinetics is more significant than that of the long-arm star. The effect of both polymers on the thermal-mechanical properties of the cured thermosets is less important due to the lower solubility at the relatively low photocuring temperatures.

    The influence of two multiarm star polymers, hyperbranched poly(glycidol)-b-poly(e-caprolactone) of different arm lengths, on the thermal curing and the photocuring of a diglycidyl ether of bisphenol A epoxy resin (DGEBA) is studied. Star polymer with short arms PCL-10 decelerates more the thermal curing than the polymer with long arms PCL-30 because the latter is less solubilized in the epoxy matrix and its effect on the polymerization of the resin and the thermal–mechanical properties is less important. The kinetic triplet corresponding to the thermal curing of the different formulations has been determined. In the analysis of the photocuring process, we have also found that short-arm star PCL-10 is better solubilized in the epoxy matrix and its effect on the photocuring kinetics is more significant than that of the long-arm star. The effect of both polymers on the thermal–mechanical properties of the cured thermosets is less important due to the lower solubility at the relatively low photocuring temperatures.

  • Multiarm star with poly(ethyleneimine) core and poly(e-caprolactone) arms as modifiers of diglycidylether of bisphenol a thermosets cured by 1-methylimidazole

     Acebo Gorostiza, Cristina; Fernández Francos, Xavier; Ferrando Piera, Francesc; Serra Albet, Àngels; Salla Tarrago, Jose M.; Ramis Juan, Xavier
    Baltic Polymer Symposium
    p. 103
    Presentation's date: 2013-09-19
    Presentation of work at congresses

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  • La evaluación continua como estrategia de aprendizaje en asignaturas de grado

     Cadenato Matia, Ana Maria; Salla Tarrago, Jose M.; Ramis Juan, Xavier; Morancho Llena, Jose Maria; Montserrat Jorda, Jose; Martin Godoy, Jose Luis
    Congreso Nacional de Ingeniería Termodinámica
    p. 1339-1346
    Presentation's date: 2013-06
    Presentation of work at congresses

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  • Unexpected differences between thermal and photoinitiated cationic curing of a DGEBA modified with a multiarm star poly(styrene)-b-poly(e-caprolactone) polymer

     Morancho Llena, Jose Maria; Cadenato Matia, Ana Maria; Ramis Juan, Xavier; Morell, Mireia; Fernández Francos, Xavier; Serra Albet, Àngels; Salla Tarrago, Jose M.
    International Symposium Frontiers in Polymer Science
    p. P1.28
    Presentation's date: 2013-05
    Presentation of work at congresses

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  • Access to the full text
    Unexpected differences between thermal and photoinitiated cationic curing oa a diglycidyl ether of bisphenol. A modified with a multiarm star poly (styrene)-b-poly (e-caprolactone) polymer  Open access

     Morancho Llena, Jose Maria; Cadenato Matia, Ana Maria; Ramis Juan, Xavier; Morell, Mireia; Fernández Francos, Xavier; Salla Tarrago, Jose M.; Serra Albet, Àngels
    Express polymer letters
    Vol. 7, num. 7, p. 565-576
    DOI: 10.3144/expresspolymlett.2013.54
    Date of publication: 2013-03-18
    Journal article

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    The effect of adding a multiarm star poly(styrene)-b-poly("-caprolactone) polymer on the cationic thermal and photoinitiated curing of diglycidyl ether of bisphenol A was studied. This star-polymer decelerated the thermal curing of diglycidyl ether of bisphenol A and modified the final structure of the epoxy matrix. The photocuring was influenced significantly by the addition of the multiarm star. When the proportion of this modifier added was 5%, much more time was necessary for complete photocuring (160 min at 40ºC). In the presence of 10% of modifier, the degree of photocuring reached was very low (0.196 at 120°C). A subsequent thermal post-curing was necessary to cure completely the system. During photocuring in presence of poly(styrene)-b-poly("-caprolactone), the formation of dormant species, which are reactivated when the temperature increases, takes places. The kinetics of the thermal curing and the photocuring was analyzed using an isoconversional method due to the complexity of the reactive process. Applying this method, it has been confirmed the dependence of activation energy on the degree of conversion. The fracture morphology analyzed by scanning electron microscopy exhibited a second phase originated during photocuring by the presence of the modifier.

  • Multiarm star with poly(ethyleneimine) core and poly(epsilon-caprolactone) arms as modifiers of diglycidylether of bisphenol A thermosets cured by 1-methylimidazole

     Acebo Gorostiza, Cristina; Fernández Francos, Xavier; Ferrando Piera, Francesc; Serra Albet, Àngels; Salla Tarrago, Jose M.; Ramis Juan, Xavier
    Reactive and functional polymers
    Vol. 73, num. 3, p. 431-441
    DOI: 10.1016/j.reactfunctpolym.2012.11.007
    Date of publication: 2013-03
    Journal article

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    Well-defined multiarm star copolymers, with hyperbranched poly(ethyleneimine) (PEI) as the core and poly(e-caprolactone) (PCL) arms with different degree of polymerization were synthesized by cationic ring-opening polymerization of e-caprolactone from a hyperbranched poly(ethyleneimine) core and used to modify diglycidylether of bisphenol A formulations cured with 1-methylimidazole as anionic initiator. The curing process was studied by dynamic scanning calorimetry (DSC) and FTIR. By rheometry the complex viscosity of the multiarm stars synthesized and the influence of their addition to the reactive mixture was analyzed in detail. The resulting materials were characterized by thermal and mechanical tests. The addition of the multiarm star to the formulation led to homogeneous materials with a slightly toughened fracture in comparison to neat DGEBA thermosets without compromising thermal characteristics.

  • Corrigendum: Network structure and thermomechanical properties of hybrid DGEBA networks cured with 1-methylimidazole and hyperbranched poly(ethyleneimine)s

     Fernández Francos, Xavier; Santiago, David; Ferrando Piera, Francesc; Ramis Juan, Xavier; Salla Tarrago, Jose M.; Serra Albet, Àngels; Sangermano, Marco
    Journal of polymer science. Part B, polymer physics
    Vol. 51, num. 9, p. 772-773
    DOI: 10.1002/polb.23254
    Date of publication: 2013-01-25
    Journal article

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  • Network structure and thermomechanical properties of hybrid DGEBA networks cured with 1-methylimidazole and hyperbranched poly(ethyleneimine)s

     Fernández Francos, Xavier; Santiago, David; Ferrando Piera, Francesc; Ramis Juan, Xavier; Salla Tarrago, Jose M.; Serra Albet, Àngels; Sangermano, Marco
    Journal of polymer science. Part B, polymer physics
    Vol. 50, num. 21, p. 1489-1503
    DOI: 10.1002/polb.23145
    Date of publication: 2012-11-01
    Journal article

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    The use of commercially available hyperbranched poly(ethyleneimine)s (Lupasol TM , BASF) as polymeric modifiers in diglycidyl ether of bisphenol A thermosetting formulations using 1-methylimidazole (MI) as anionic initiator has been studied. Poly(ethyleneimine)s can get incorporated into the network structure by condensation of amine and epoxy groups. The excess, over-stoichiometric epoxy groups can undergo ani- onic homopolymerization initiated by MI. The thermal, dyna- momechanical, and mechanical properties of the resulting materials have been determined using DSC, thermomechanical analysis (TMA), dynamomechanical analysis (DMA), and me- chanical testing. The effect of the different amine modifiers on the MI networks, determined by their structure, is complex. Low initiator content and high molecular weight modifiers cre- ate significant mobility restrictions, which have a strong effect on the glass transition temperature and the apparent crosslink- ing density of the cured materials.

    he use of commercially available hyperbranched poly(ethyleneimine)s (Lupasol TM , BASF) as polymeric modifiers in diglycidyl ether of bisphenol A thermosetting formulations using 1-methylimidazole (MI) as anionic initiator has been studied. Poly(ethyleneimine)s can get incorporated into the network structure by condensation of amine and epoxy groups. The excess, over-stoichiometric epoxy groups can undergo ani- onic homopolymerization initiated by MI. The thermal, dyna- momechanical, and mechanical properties of the resulting materials have been determined using DSC, thermomechanical analysis (TMA), dynamomechanical analysis (DMA), and me- chanical testing. The effect of the different amine modifiers on the MI networks, determined by their structure, is complex. Low initiator content and high molecular weight modifiers cre- ate significant mobility restrictions, which have a strong effect on the glass transition temperature and the apparent crosslink- ing density of the cured materials.

  • Thermal Analysis of Enhanced Poly (vinyl alcohol)-Based Proton-Conducting Membranes Crosslinked with Sulfonation Agents for direct Methanol Fuel Cells

     Morancho Llena, Jose Maria; Salla Tarrago, Jose M.; Cadenato Matia, Ana Maria; Fernández-Francos, Xavier; Colomer Vilanova, Pere; Calventus Sole, Yolanda; Ramis Juan, Xavier; Ruiz Mansilla, Rafael
    Journal of applied polymer science
    Vol. 124, num. SI, p. E57-E65
    DOI: 10.1002/app.35500
    Date of publication: 2012-06-25
    Journal article

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  • COMPOSICIÓN Y PROCEDIMIENTO PARA EL ENTRECRUZAMIENTO DE UNA RESINA EPOXI CON UN ISOCIANATO, Y MATERIAL ENTRECRUZADO OBTENIDO

     Serra Albet, Àngels; Flores Guillen, Marjorie; Mantecón, Ana; Ramis Juan, Xavier; Fernandez Francos, Xavier; Salla Tarrago, Jose M.
    Date of request: 2012-01-26
    Invention patent

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  • Nuevos termoestables mejorados basados en resinas epoxi y polímeros dendríticos

     Cadenato Matia, Ana Maria; Salla Tarrago, Jose M.; Morancho Llena, Jose Maria; Ramis Juan, Xavier
    Competitive project

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  • Determinació de la calor de combustió d’una closca d’arròs

     Morancho Llena, Jose Maria; Salla Tarrago, Jose M.; Cadenato Matia, Ana Maria; Martin Godoy, Jose Luis; Montserrat Jorda, Jose; Ramis Juan, Xavier
    Date: 2011-12-15
    Report

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    Determinació mitjançant una bomba calorimètrica de la calor de combustió d'una closca d'arròs.

  • Comparative curing kinetics and thermal-mechanical properties of DGEBA thermosets cured with a hyperbranched poly(ethyleneimine) and an aliphatic triamine

     Santiago, David; Fernandez Francos, Xavier; Ramis Juan, Xavier; Salla Tarrago, Jose M.; Sangermano, Marco
    Thermochimica acta
    Vol. 526, num. 1-2, p. 9-21
    DOI: 10.1016/j.tca.2011.08.016
    Date of publication: 2011-11-10
    Journal article

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    The use of commercially available hyperbranched poly(ethyleneimine)s (Hbpei, LupasolTM, BASF) as curing agent of DGEBA has been studied. HBpei can react with epoxy monomers by an epoxy-amine condensation mechanism and get incorporated into the network structure of the thermoset. The resulting materials have been compared with those obtained using diethylenetriamine (DETA) as curing agent. The curing kinetics have been studied with DSC and rheology. The thermal–mechanical properties have been determined with DMA and DSC. The thermal stability has been assessed with TGA. The curing kinetics and the different transformations that take place during curing of both formulations have been summarized in a TTT diagram. Because of the low mobility of HBpei, curing kinetics is slower than the formulations with DETA. Both HBpei and DETA produce homogeneous materials with similar Tg and thermal stability, but HBpei materials are more densely crosslinked than DETA because of the preexisting internal crosslinks of HBpei.

  • Kinetic studies of the degradation of poly (vinyl alcohol)-based proton-conducting membranes at low temperatures

     Morancho Llena, Jose Maria; Salla Tarrago, Jose M.; Cadenato Matia, Ana Maria; Fernandez Francos, Xavier; Ramis Juan, Xavier; Colomer Vilanova, Pere; Ruiz Mansilla, Rafael; Calventus Sole, Yolanda
    Thermochimica acta
    Vol. 521, num. 1-2, p. 139-147
    DOI: 10.1016/j.tca.2011.04.016
    Date of publication: 2011-07-10
    Journal article

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    Thermal decomposition of unmodified poly(vinyl alcohol) (PVA) and poly(vinyl alcohol) crosslinked with sulfosuccinic acid (SSA) membranes has been studied using thermogravimetry (TGA) and ATR Fourier transform infrared spectroscopy (ATR-FTIR). Both types of membranes degrade in a two-step process. However, the introduction of SSA leads to an advance of the decomposition steps at very low temperatures. The reduction in the hydrogen-bond interactions of hydroxyl groups of unmodified PVA because of the presence of SSA crosslinks and the catalytic effect promoted by sulfonic acid group (–SO3H) of SSA can contribute to this different behavior. The kinetics of thermal degradation was investigated by TGA and derivative TGA (DTGA) curves from experiments under non-isothermal conditions at different heating rates. The Friedman isoconversional differential method was used to calculate the activation energy as a function of the reaction weight loss without any previous assumption on the kinetic model. For a representative stage of decomposition, preexponential factor and kinetic model were also obtained. Postcuring isothermal treatments and ATR-FTIR analysis of selected membranes have been used to verify the TGA analysis and add additional information.

  • Enhancement of epoxy thermosets by modification with comercially available poly(ethyleneimine)s (LUPASOLTM) as polymeric modifiers

     Ramis Juan, Xavier; Santiago, David; Fernandez Francos, Xavier; Salla Tarrago, Jose M.; Cadenato Matia, Ana Maria; Morancho Llena, Jose Maria; Serra Albet, Àngels
    European Polymer Congress
    p. 765
    Presentation's date: 2011-06-26
    Presentation of work at congresses

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  • Study of rare earth metal triflates as new catalyst for the formation of oxazolidone-isocyanurate-ether

     Flores Guillen, Marjorie; Fernandez Francos, Xavier; Salla Tarrago, Jose M.; Mantencón, A.; Serra Albet, Àngels; Ramis Juan, Xavier; Jimenez Pique, Emilio
    European Polymer Congress
    p. 619
    Presentation's date: 2011-06-26
    Presentation of work at congresses

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  • Estudio calorimétrico de los cambios en la cristalinidad de membranas conductoras de polivinil alcohol entrecruzadas con ácido sulfosuccínico para pilas de combustible de metanol

     Salla Tarrago, Jose M.; Cadenato Matia, Ana Maria; Morancho Llena, Jose Maria; Fernandez Francos, Xavier; Ramis Juan, Xavier
    Congreso Nacional de Ingeniería Termodinámica
    p. 1-12
    Presentation's date: 2011-06-15
    Presentation of work at congresses

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    En este trabajo se analizan los cambios en el grado de cristalización y en los hábitos cristalinos que el ácido sulfosuccínico (SSA) produce en membranas de polivinil alcohol (PVA). Las membranas resultantes del entrecruzamiento del PVA con SSA, un agente que incorpora además grupos sulfónicos que hacen al conjunto un buen conductor protónico, pueden utilizarse como electrolito en pilas de combustible alimentadas directamente con metanol (DMFC). Por medio de ensayos dinámicos de fusión y cristalización por calorimetría DSC se han obtenido el grado de cristalinidad y los parámetros cinéticos de cristalización de las diferentes membranas fabricadas. Para el análisis cinético se ha utilizado el método de Avrami modificado para ensayos no isotérmicos y el método de Ozawa modificado. Los ensayos calorimétricos se han complementado con ensayos mecánicos en un analizador dinámico mecánico con el que se han medido las variaciones del módulo elástico con la temperatura. Los análisis de muestras mediante espectroscopia infrarroja con transformada de Fourier y reflectancia total atenuada (FTIR-ATR) han servido para complementar el análisis de la cristalinidad y determinar el alcance de la posible degradación de las membranas al someterlas a temperaturas elevadas. Entre los resultados que se mostrarán en esta comunicación, cabe destacar la disminución drástica de la cristalinidad al añadir el SSA en proporciones pequeñas y la importancia que tiene el contenido de agua estructural en el desarrollo de la cristalinidad tanto en membranas de PVA solo como en membranas de PVA-SSA y las consecuencias que todo ello tiene en su resistencia térmica y mecánica.

  • Protocolo para un sistema de gestión interna de la calidad de asignaturas en los títulos de grado

     Cadenato Matia, Ana Maria; Salla Tarrago, Jose M.; Ramis Juan, Xavier; Morancho Llena, Jose Maria; Montserrat Jorda, Jose; Martin Godoy, Jose Luis
    Congreso Nacional de Ingeniería Termodinámica
    p. 1-10
    Presentation's date: 2011-06-15
    Presentation of work at congresses

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    En este trabajo, se desarrolla un protocolo para establecer un Sistema de Gestión Interna de la Calidad (SGIC) de asignaturas de la titulación de Grado en Ingeniería en Tecnologías Industriales dentro del proceso de adaptación de asignaturas del Departamento de Máquinas y Motores Térmicos de la Universidad Politécnica de Cataluña (UPC) a los requerimientos del Espacio Europeo de Educación Superior. Los requisitos que se han de cumplir para desarrollar el SGIC, pueden describirse en las siguientes cuatro fases: 1. Fase planificación de una asignatura: es la etapa del diseño del proceso enseñanzaaprendizaje donde se establecen los requisitos que ha de cumplir una buena planificación. La planificación ha de facilitar el desarrollo y seguimiento del proceso educativo y se ha de plasmar documentalmente mediante la guía docente y el plan docente de la asignatura, al tiempo que se deben definir los indicadores que nos permitirán obtener información durante la fase siguiente. 2. Fase de desarrollo y seguimiento del plan docente para favorecer el aprendizaje del alumnado. En esta fase es donde se desarrollan las actividades o tareas previstas en el plan, recogiendo las evidencias de acuerdo con los indicadores establecidos y que permiten reorientar el proceso si es necesario. 3. Fase de medida del proceso de enseñanza-aprendizaje: de acuerdo con los indicadores predefinidos, se miden y se tratan los datos y los resultados obtenidos. 4. Fase de mejora: en esta fase es donde se analizan los resultados y se proponen acciones correctoras para ediciones posteriores. Este protocolo se ha implementado de manera piloto en uno de los grupos de la asignatura de Ingeniería Térmica. Esta asignatura será la primera del Departamento de Máquinas y Motores Térmicos que se imparta en los Grados. Los resultados demuestran que la utilización del SGIC es clave para potenciar el aprendizaje del alumnado y que tiene un impacto positivo en el rendimiento académico. Por otro lado la optimización de este proceso permite también conseguir una dedicación más eficiente por parte del profesorado.

  • Desarrollo de un protocolo para un sistema de gestión interna de la calidad de asignaturas de la titularidad de grado

     Cadenato Matia, Ana Maria; Salla Tarrago, Jose M.; Ramis Juan, Xavier; Morancho Llena, Jose Maria; Montserrat Jorda, Jose; Martin Godoy, Jose Luis
    Congreso Nacional de Ingeniería Termodinámica
    p. 1-10
    Presentation's date: 2011-06-15
    Presentation of work at congresses

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  • New thermosets obtained from bisphenol A diglycidyl ether and hydroxyl-ended hyperbranched polymers partially blocked with benzoyl and trimethylsilyl groups

     Foix, David; Fernandez Francos, Xavier; Salla Tarrago, Jose M.; Serra Albet, Àngels; Morancho Llena, Jose Maria; Ramis Juan, Xavier
    Polymer international
    Vol. 60, num. 3, p. 389-397
    DOI: 10.1002/pi.2959
    Date of publication: 2011-03
    Journal article

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  • Influence of the end groups of hyperbranched poly(glycidol) on the cationic curing and morphology of diglycidylether of bisfenol A thermosets

     Santiago, David; Morell, Mireia; Fernandez Francos, Xavier; Serra Albet, Àngels; Salla Tarrago, Jose M.; Ramis Juan, Xavier
    Reactive and functional polymers
    Vol. 71, num. 4, p. 380-389
    DOI: 10.1016/j.reactfunctpolym.2010.12.008
    Date of publication: 2011-03
    Journal article

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    The cationic curing of DGEBA with hyperbranched polymers (HBPs) based on poly(glycidol) using ytterbium triflate as initiator, has been studied. Poly(glycidol) (PG) has been synthesized and the terminal hydroxyl groups have been partially end-capped with benzoyl end groups to produce benzoylated poly(glycidol) (PGBz). The hydrophylic character caused by the high hydroxyl group content of unmodified PG limits its solubility in DGEBA, while a partial modification with benzoyl groups makes PGBz fully miscible in DGEBA. Therefore, important differences are observed with respect to the curing kinetics, network development, properties and morphology of the cured materials, which may be related to the hydroxyl group content of the HBPs.

  • Effect of a hyperbranched polymer over the thermal curing and the photocuring of an epoxy resin

     Morancho Llena, Jose Maria; Cadenato Matia, Ana Maria; Ramis Juan, Xavier; Fernandez Francos, Xavier; Flores Guillen, Marjorie; Salla Tarrago, Jose M.
    Journal of thermal analysis and calorimetry
    Vol. 105, num. 2, p. 479-488
    DOI: 10.1007/s10973-010-1277-8
    Date of publication: 2011
    Journal article

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    In this study, the authors study by calorimetry the influence of hyperbranched polyester Boltron®H40 on the thermal curing and the photocuring of a diglycidyl ether of bisphenol epoxy resin (DGEBA) using ytterbium (III) trifluoromethanesulfonate and triarylsulfonium hexafluorantimonate as thermal and photo cationic initiators, respectively. In the dynamic thermal curing at different heating rates, the authors have seen a decelerating effect when H40 is added to DGEBA, the system with 10% of H40 being the slowest. An isoconversional method has been used to determine the apparent activation energy of the thermal curing. In the isothermal photocuring at low temperatures, the authors have also appreciated a decelerating effect on adding H40, obtaining a minimum conversion when the H40 proportion is 15%. However, at high temperatures, the photocuring process can be accelerated at the first part of this process. This behavior is a consequence of the temperature dependence of H40 solubility in DGEBA, the viscosity of the system, and the hydroxyl-induced chain-transfer reaction. The values found of the maximum glass transition temperature in the thermal curing and in the photocuring, show that H40 is not completely solubilized in the reacted system.

    In this study, the authors study by calorimetry the influence of hyperbranched polyester Boltron®H40 on the thermal curing and the photocuring of a diglycidyl ether of bisphenol epoxy resin (DGEBA) using ytterbium (III) trifluoromethanesulfonate and triarylsulfonium hexafluorantimonate as thermal and photo cationic initiators, respectively. In the dynamic thermal curing at different heating rates, the authors have seen a decelerating effect when H40 is added to DGEBA, the system with 10% of H40 being the slowest. An isoconversional method has been used to determine the apparent activation energy of the thermal curing. In the isothermal photocuring at low temperatures, the authors have also appreciated a decelerating effect on adding H40, obtaining a minimum conversion when the H40 proportion is 15%. However, at high temperatures, the photocuring process can be accelerated at the first part of this process. This behavior is a consequence of the temperature dependence of H40 solubility in DGEBA, the viscosity of the system, and the hydroxyl-induced chain-transfer reaction. The values found of the maximum glass transition temperature in the thermal curing and in the photocuring, show that H40 is not completely solubilized in the reacted system

  • Novel thermosets based on DGEBA and hyperbranched polymers modified with vinyl and epoxy end groups

     Fernandez Francos, Xavier; Foix, David; Serra Albet, Àngels; Salla Tarrago, Jose M.; Ramis Juan, Xavier
    Reactive and functional polymers
    Vol. 70, num. 10, p. 798-806
    DOI: 10.1016/j.reactfunctpolym.2010.07.008
    Date of publication: 2010-10
    Journal article

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  • Poster Award Winner of the 10th. European Symposium on Thermal Analysis and Calorimetry

     Salla Tarrago, Jose M.; Cadenato Matia, Ana Maria; Fernandez Francos, Xavier; Ramis Juan, Xavier; Colomer Vilanova, Pere; Calventus Sole, Yolanda; Ruiz Mansilla, Rafael; Morancho Llena, Jose Maria
    Award or recognition

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  • Effect of a hyperbranched polymer over the thermal curing and the photocuring of an epoxy resin

     Morancho Llena, Jose Maria; Cadenato Matia, Ana Maria; Ramis Juan, Xavier; Fernandez Francos, Xavier; Flores, Marjori; Salla Tarrago, Jose M.
    European Symposium on Thermal Analysis and Calorimetry
    p. 171
    Presentation's date: 2010-08-23
    Presentation of work at congresses

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  • Thermal analysis of enhanced poly(vinyl alcohol)-based proton-conducting membranes crosslinked with sulfonation agents for direct methanol fuel cells

     Salla Tarrago, Jose M.; Cadenato Matia, Ana Maria; Morancho Llena, Jose Maria; Fernandez Francos, Xavier; Ramis Juan, Xavier; Colomer Vilanova, Pere; Calventus Sole, Yolanda; Ruiz Mansilla, Rafael
    European Symposium on Thermal Analysis and Calorimetry
    p. 218
    Presentation's date: 2010-08-23
    Presentation of work at congresses

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  • Copolymerization of diglycidylether of bisphenol A and bicyclic bis(gamma-lactone)s using rare earth metal triflates as initiators studied with infrared spectroscopy

     Arasa, Mercè; Ramis Juan, Xavier; Salla Tarrago, Jose M.; Mantecón Arranz, Ana; Serra Albet, Àngels
    Polymer international
    Vol. 59, num. 8, p. 1039-1045
    DOI: 10.1002/pi.2821
    Date of publication: 2010-08
    Journal article

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  • COMPOSICIÓN Y PROCEDIMIENTO PARA EL ENTRECRUZAMIENTO DE UNA RESINA EPOXI CON UN ISOCIANATO, Y MATERIAL ENTRECRUZADO OBTENIDO.

     Serra Albet, Àngels; Flores, Marjori; Mantecón Arranz, Ana; Ramis Juan, Xavier; Fernández Francos, Xavier; Salla Tarrago, Jose M.
    Date of request: 2010-07-20
    Invention patent

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    Composición y procedimiento para el entrecruzamiento de una resina epoxi con un isocianato, y material entrecruzado obtenido.

    La presente invención describe una composición para el entrecruzamiento de una resina epoxi con un isocianato, que comprende: una resina epoxi, un poliisocianato, y un triflato de tierra rara, donde la tierra rara se selecciona del grupo formado por escandio, itrio, lantano, cerio, praseodimio, neodimio, prometio, samario, europio, gadolinio, terbio, disprosio, holmio, erbio, tulio, iterbio y lutecio. Asimismo se describe un procedimiento para obtener dicha composición, un procedimiento para el entrecruzamiento de la resina epoxi con el poliisocianato que comprende poner en contacto los componentes y calentar, así como el material entrecruzado obtenido.

  • New thermosets based on oxazolidone-isocyanurate-ether polymers and hydroxylated hyperbranched polymers modified with vinyl and epoxy end groups

     Flores Guillen, Marjorie; Salla Tarrago, Jose M.; Ramis Juan, Xavier; Morancho Llena, Jose Maria; Fernandez Francos, Xavier; Serra Albet, Àngels
    MACRO2010 43 rd IUPAC World Polymer Congress Polymer Science in the Service of society
    p. 8
    Presentation's date: 2010-07-11
    Presentation of work at congresses

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  • Thermal curing and photocuring of an epoxy resin modified with a hyperbranched polymer

     Morancho Llena, Jose Maria; Cadenato Matia, Ana Maria; Ramis Juan, Xavier; Fernandez Francos, Xavier; Salla Tarrago, Jose M.
    Thermochimica acta
    Vol. 510, p. 1-8
    DOI: 10.1016/j.tca.2010.05.008
    Date of publication: 2010-06-01
    Journal article

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    In this work we study the influence of a hyperbranched polymer (BOLTORN® H20) on the thermal curing and photocuring of DGEBA. Addition of low amounts of H20 slowed down dynamic thermal curing but further addition accelerated the process. During isothermal photocuring, H20 decelerated the process at low temperatures and accelerated it at high temperatures. The temperature dependence of H20 solubility, its viscosity and the hydroxyl-induced chain-transfer reaction, are responsible for this behaviour. The addition of H20 resulted in a decrease in the glass transition temperature using both curing techniques but in a different way.

  • Crosslinking of Mixtures of DGEBA with 1,6-dioxaspiro[4,4]nonan-2,7-dione initiated by tertiary amines. Part IV. Effect of hydroxyl groups on initiation and curing kinetics

     Fernandez Francos, Xavier; Cook, Wayne D.; Serra Albet, Àngels; Ramis Juan, Xavier; Liang, Genhai G.; Salla Tarrago, Jose M.
    Polymer
    Vol. 51, num. 1, p. 26-34
    DOI: 10.1016/j.polymer.2009.11.013
    Date of publication: 2010-01-06
    Journal article

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    The anionic homopolymerization of DGEBA epoxy resin and its anionic copolymerization with a bislactone was studied using two alternative tertiary amines, 1-methylimidazole (1MI) and dimethylaminopyridine (DMAP) as initiators. 1MI caused slower cure than DMAP in neat DGEBA and DGEBA-bislactone formulations. Studies of the influence of the hydroxyl concentration in the DGEBA oligomer on its homopolymerization explain descrepancies in the literature regarding the ability of these initiators to produce full cure of the epoxy groups. In contrast, in the copolymerization of DGEBA-bislactone formulations, full cure could be readily achieved with either 1MI or DMAP as initiators, irrespective of the hydroxyl content. FTIR and DSC experiments show that this behaviour is associated with the formation of the carboxylate anion which plays an important part on the curing kinetics and the completion of cure.

  • Crosslinking of mixtures of diglycidylether of bisphenol-A with 1,6-dioxaspiro[4.4] nonan-2,7-dione initiated by tertiary amines: III. Effect of hydroxyl groups on network formation

     Fernandez Francos, Xavier; Cook, Wayne D.; Salla Tarrago, Jose M.; Serra Albet, Àngels; Ramis Juan, Xavier
    Polymer international
    Vol. 58, num. 12, p. 1401-1410
    DOI: 10.1002/pi.2675
    Date of publication: 2009-12
    Journal article

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  • Influence of the molecular weight of a poly(ester-amide) hyperbranched polymer on the characteristics of modified epoxi thermosets

     Morell, Mireia; Erber, Michael; Voit, Brigitte; Ramis Juan, Xavier; Salla Tarrago, Jose M.; Ferrando Piera, Francesc; Serra Albet, Àngels
    International Conference on Advanced Polymers via Macromolecular Engineering
    p. 116
    Presentation's date: 2009-10
    Presentation of work at congresses

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  • Anionic copolymerization of DGEBA/hydroxyl-terminated hyperbranched polymer mixtures initiated by 1-methylimidazole

     Fernandez Francos, Xavier; Ramis Juan, Xavier; Sala, Xavier; Morancho Llena, Jose Maria; Cadenato Matia, Ana Maria; Salla Tarrago, Jose M.; Serra Albet, Àngels; Mantecón, Ana
    International Conference on Advanced Polymers via Macromolecular Engineering
    p. 182
    Presentation's date: 2009-10
    Presentation of work at congresses

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  • Nuevos termoestables con propiedades mejoradas a base de resinas epoxi y polímeros hiperramificados con grupos terminales hidroxilo, benzoilo o trimetilsililo

     Ramis Juan, Xavier; Serrano, D.; Fernandez Francos, Xavier; Morancho Llena, Jose Maria; Cadenato Matia, Ana Maria; Salla Tarrago, Jose M.; Foix, David; Serra Albet, Àngels
    Reunión del Grupo Especializado de Polímeros
    p. 143-
    Presentation's date: 2009-09-20
    Presentation of work at congresses

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  • New Thermosets Obtained by Thermal and UV-Induced Cationic Copolymerization of DGEBA with 4-phenyl-gamma -butyrolactone

     Fernandez Francos, Xavier; Salla Tarrago, Jose M.; Pérez, G; Mantecón, A; Serra, A; Ramis Juan, Xavier
    Macromolecular chemistry and physics
    Vol. 210, num. 17, p. 1450-1460
    DOI: 10.1002/macp.200900118
    Date of publication: 2009-09
    Journal article

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  • Efecto de la temperatura de procurado en el entrecruzamiento de membranas conductoras basadas en el polivinil alcohol (PVA) y el ácido sulfosuccínico (SSA)

     Morancho Llena, Jose Maria; Salla Tarrago, Jose M.; Cadenato Matia, Ana Maria; Ramis Juan, Xavier; Colomer Vilanova, Pere; Calventus Sole, Yolanda; Ruiz Mansilla, Rafael; Fernandez Francos, Xavier
    Reunión del Grupo Especializado de Polímeros
    p. 159
    Presentation's date: 2009-09
    Presentation of work at congresses

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  • Nuevos termoestables con propiedades mejoradas a base de resinas epoxi y polímeros hiperramificados con grupos vinilo y epoxi

     Fernandez Francos, Xavier; Ramis Juan, Xavier; Arauz, Ana; Morancho Llena, Jose Maria; Cadenato Matia, Ana Maria; Salla Tarrago, Jose M.; Foix, David; Serra Albet, Àngels
    Reunión del Grupo Especializado de Polímeros
    p. 146
    Presentation's date: 2009-09
    Presentation of work at congresses

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  • POLÍMERS TERMOESTABLES EPOXIDICS

     Fernandez Francos, Xavier; Hutchinson, John M.; Salla Tarrago, Jose M.; Colomer Vilanova, Pere; Roman Concha, Frida Rosario; Calventus Sole, Yolanda; Morancho Llena, Jose Maria; Cadenato Matia, Ana Maria; Fraga Rivas, Iria; Shiravand, Fatemeh; Ramis Juan, Xavier
    Competitive project

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  • Curat tèrmic i fotocurat de resines epoxi per al control químic de la contracció i millora de la degradabilitat.

     Fernandez Francos, Xavier
    Department of Heat Engines, Universitat Politècnica de Catalunya
    Theses

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  • New thermosets from DGEBA and poly(ester-amide) hyperbrabched polymers cured by methyltetrahydrophthalic anhydride

     Morell, Mireia; Yu, Y; Ramis Juan, Xavier; Salla Tarrago, Jose M.; Ferrando Piera, Francesc; Mantecón, Ana; Serra Albet, Àngels
    International Symposium Frontiers in Polymer Science
    Presentation's date: 2009-06-07
    Presentation of work at congresses

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  • Procesos de Sorción-desorción de Agua en Membranas Para Pilas de Combustible Alimentadas Directamente con Metanol

     Cadenato Matia, Ana Maria; Salla Tarrago, Jose M.; Ramis Juan, Xavier; Morancho Llena, Jose Maria; Colomer Vilanova, Pere; Calventus Sole, Yolanda; Ruiz Mansilla, Rafael; Fernandez Francos, Xavier
    Jornadas Nacionales de Ingeniería Termodinámica
    p. 242
    Presentation's date: 2009-06-03
    Presentation of work at congresses

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  • Experiencia de mejora continuada en la metodología de las prácticas de Termodinámica enmarcada en el EEES

     Cadenato Matia, Ana Maria; Salla Tarrago, Jose M.; Ramis Juan, Xavier; Morancho Llena, Jose Maria; Martin Godoy, Jose Luis; Montserrat Jorda, Jose
    VI Jornadas nacionals de Ingeniería Termodinàmica
    p. 1-13
    Presentation's date: 2009-06-03
    Presentation of work at congresses

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