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1 to 16 of 16 results
  • Nanocompuestos exfoliados de butilen tereftalato cíclico/arcilla obtenidos por polimerización in-situ

     Abt, Tobias Martin; Sanchez Soto, Miguel Angel; Martinez Benasat, Antonio; Illescas Fernandez, Silvia; Arencón Osuna, David
    Congreso Nacional de Materiales
    Presentation's date: 2014-06-18
    Presentation of work at congresses

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    Isocyanate toughened pCBT: reactive blending and tensile properties  Open access

     Abt, Tobias Martin; Martinez de Ilarduya Saez de Asteasu, Antxon; Bou Serra, Jorge; Sanchez Soto, Miguel Angel
    Express polymer letters
    Date of publication: 2013-02-01
    Journal article

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    Cyclic butylene terephthalate oligomers (CBT) were reacted in a ring-opening polymerization with three types of isocyanates: a bifunctional aromatic type, a bifunctional aliphatic type and a polymeric aromatic isocyanate. All reactions took place in a batch mixer. The use of 0.5 to 1 wt% isocyanate led to a dramatic increase in elongation at break of polymerized cyclic butylene terephthalate (pCBT), from 8 to above 100%. The stiffness and strength of the modified pCBT, however, were found to slightly decrease. Proton nuclear magnetic resonance (NMR) analysis shows that the formation of thermally stable amide groups is the dominant chain extension reaction mechanism. Gel content measurements suggest a linear structure for samples containing bifunctional isocyanates while pCBT modified with polyfunctional isocyanate exhibited some gel formation at higher isocyanate content. Melting and crystallization temperatures as well as degree of crystallinity were found to decrease with increasing isocyanate content. No phase separation was detected by scanning electron microscopy (SEM) analysis. Moreover, a high degree of polymerization is deduced due to the absence of CBT oligomer crystals.

    Electronic version of an article published as "Express polymer letters" vol. 7, nº. 2, February 2013, p. 172-185.

  • Properties of POSS blends with pCBT, PMMA, PC and POM thermoplastics

     Abt, Tobias Martin; Sanchez Soto, Miguel Angel; Illescas Fernandez, Silvia; Arostegui, Asier
    International journal of materials and structural integrity
    Date of publication: 2013
    Journal article

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    The influence of the functionalisation of fully or partially condensed POSS cages on the properties of engineering thermoplastic-based nanocomposites is studied. POSS with different organic substituents were selected in accordance with the structure and chemical composition of the host polymer and melt mixed with the corresponding matrix. In general, good dispersion at the nanoscale level was achieved upon the addition of some functionalised POSS, leading to a remarkable increase on the thermal decomposition temperature under nitrogen atmosphere. However, for the polymers having high decomposition temperatures, there were no significant changes on the thermal properties of the nanocomposites. On the other hand, the dispersion of the POSS, whatever its functionalisation was, led to the presence of micron-sized aggregates. The relationships among these effects and the morphological characteristics of the systems were analysed.

  • Toughening of in situ polymerized cyclic butylene terephthalate by chain extension with a bifunctional epoxy resin

     Abt, Tobias Martin; Sanchez Soto, Miguel Angel; Martinez de Ilarduya Saez de Asteasu, Antxon
    European polymer journal
    Date of publication: 2012-01-01
    Journal article

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  • Determinacion de la resistencia dinámica a clivaje de adhesivos estructurales

     Sanchez Soto, Miguel Angel; Abt, Tobias Martin
    Date: 2012-11-27
    Report

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  • Determinacion de la resistencia dinámica a clivaje de adhesivos estructurales

     Sanchez Soto, Miguel Angel; Abt, Tobias Martin
    Date: 2012-11-12
    Report

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  • Toughening of in situ polymerized cyclic butylene terephthalate by addition of tetrahydrofuran

     Abt, Tobias Martin; Sanchez Soto, Miguel Angel; Illescas Fernandez, Silvia; Aurrekoetxea Narbarte, Jon; Sarrionandia, Mariasun
    Polymer international
    Date of publication: 2011-04
    Journal article

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    A new method of toughening polymerized cyclic butylene terephthalate (pCBT) with tetrahydrofuran (THF) is proposed. The pCBT was prepared by in situ ring-opening polymerization of a commercial cyclic butylene terephthalate, a cyclic form of poly(butylene terephthalate), in the presence of THF. In comparison to conventionally polymerized pCBT, the resultant material was found to be ductile, showing a strain at break of well above 100% in tensile tests. Other matrix properties, such as tensile modulus, tensile strength and glass transition temperature, were not significantly altered by the addition of THF. It was found that the presence of THF enhanced the polymerization reaction, resulting in an increased molecular weight and a narrowed molecularweightdistribution. Moreover, remaining oligomers after polymerization were extractedby the THF anda toughened oligomer-free pCBT was obtained. The influence of time and temperature on the long-time toughening action of THF was studied. The results showed that samples became brittle after 3months when subjected to a temperature of 80 ◦C, resulting in a reduction of the toughening action. c 2010 Society of Chemical Industry

  • Influence of clay and polymer on the morphology and properties of PVOH/clay aerogels

     Sanchez Soto, Miguel Angel; Rojas, J.; Illescas Fernandez, Silvia; Abt, Tobias Martin; Caceres Moreno, Maria Angelica; Arostegui, Asier
    Congreso Nacional de Materiales Compuestos
    Presentation's date: 2011-07-08
    Presentation of work at congresses

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  • Adhesion between polypropylene and steel by over moulding

     Sanchez Soto, Miguel Angel; Illescas Fernandez, Silvia; Abt, Tobias Martin; Candal, María Virginia; Gómez, Jaime Francisco
    EUROTEC
    Presentation's date: 2011-11-14
    Presentation of work at congresses

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  • Caracterización de un material plástico hecho a partir de plásticos reciclados

     Sanchez Soto, Miguel Angel; Abt, Tobias Martin
    Date: 2010-05-27
    Report

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  • Obtención y caracterización de nanocompuestos PMMA/POSS estabilizados térmicamente

     Illescas Fernandez, Silvia; Abt, Tobias Martin; de Redondo Realinho, Vera Cristina; Velazquez, Julio; Sanchez Soto, Miguel Angel
    Congreso Nacional de Jóvenes Investigadores en Polímeros
    Presentation's date: 2010-05-03
    Presentation of work at congresses

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    Nanocomposites of in-situ polymerized cyclic butylene terephthalate and polyhedral oligomeric silsesquioaxanes  Open access

     Abt, Tobias Martin; Illescas Fernandez, Silvia; de Sousa Pais Antunes, Marcelo; Caceres Moreno, Maria Angelica; Sanchez Soto, Miguel Angel
    Congreso Nacional de Jóvenes Investigadores en Polímeros
    Presentation's date: 2010-05-03
    Presentation of work at congresses

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    Nanocomposites were prepared by in-situ polymerization of CBT®, a cyclic form of poly(butylene terephthalate) (PBT) and polyhedral oligomeric silsesquioxane (POSS®) with 2.5, 5 and 10 wt% POSS content. Three different types of POSS were used; two with reactive functional groups, Trisilanolphenyl POSS (TPOSS) and Glycidyl POSS (G-POSS) and one POSS type having non-reactive functionality, Isooctyl POSS (I-POSS). SEM analysis showed that I-POSS was finely dispersed at a nanoscale level within the CBT, whereas T-POSS and GPOSS formed agglomerates microscaled rather than nanoscaled. T-POSS hinders the polymerization reaction of the CBT, resulting in a poor consolidation of the composite. However, Glycidyl POSS was found to crosslink the CBT during polymerization, making it possible to alter the final material properties. All nanocomposites with 10 wt% POSS content showed a hindered cold crystallization and subsequently showed no melting peak of the formed polymer in a DSC scan.

    Postprint (author’s final draft)

  • Modificación de PC mediante extrusión reactiva: comportamiento a fractura

     Santana Pérez, Orlando Onofre; Al-Jabareen, Ahmad; Illescas Fernandez, Silvia; Abt, Tobias Martin; Sanchez Soto, Miguel Angel
    Reunión del Grupo Especializado de Polímeros
    Presentation's date: 2009-09-20
    Presentation of work at congresses

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  • Lightcarboncars: nanocompuestos CBT/POSS obtenidos por polimerización in-situ

     Abt, Tobias Martin; Sanchez Soto, Miguel Angel; Illescas Fernandez, Silvia; Gamez Pérez, Jose; Maspoch Ruldua, Maria Lluïsa
    Congreso Nacional de Materiales Compuestos
    Presentation's date: 2009-10-07
    Presentation of work at congresses

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    En este trabajo se han preparado e investigado nanocompuestos formados por CBT® y tres tipos diferentes de nanocargas de tipo oligómerico poliédrico (POSS), dos con funcionalidad reactiva -Trisilanolfenil POSS (T-POSS) y Glicidil POSS (G-POSS)- y uno no reactivo -Isooctil POSS (I-POSS)-. Los POSS fueron mezclados con el CBT en cantidades del 2.5, 5 y 10% previamente a su polimerización, que fue llevada a cabo en una prensa de platos calientes. El análisis micrográfico reveló, en general, una buena miscibilidad del POSS en el CBT. El I-POSS se dispersó a nivel nanométrico en la matriz mientras que tanto el T-POSS como el G-POSS formaron pequeños aglomerados de rango micrométrico. Finalmente, se ha encontrado que el T-POSS interacciona con el proceso de polimerización del CBT inhibiendo la cristalización, mientras que el G-POSS puede inducir la formación de reticulación del CBT durante el procesado siendo posible de este modo aumentar la resistencia térmica del material.