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New epoxy thermosets modified with amphiphilic multiarm star polymers as toughness enhancer

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10.1016/j.reactfunctpolym.2014.07.022
 
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hdl:2117/24935

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Lagunas Calpe, Carlos
Fernández Francos, XavierMés informacióMés informacióMés informació
Ferrando Piera, FrancescMés informació
Flores Guillen, Marjorie
Serra Albet, Maria ÀngelsMés informació
Morancho Llena, José MaríaMés informacióMés informacióMés informació
Salla Tarragó, José MaríaMés informacióMés informació
Ramis Juan, XavierMés informacióMés informacióMés informació
Document typeArticle
Defense date2014-10-01
Rights accessRestricted access - publisher's policy
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
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.
CitationLagunas, C. [et al.]. New epoxy thermosets modified with amphiphilic multiarm star polymers as toughness enhancer. "Reactive and functional polymers", 01 Octubre 2014, vol. 83, p. 132-143. 
URIhttp://hdl.handle.net/2117/24935
DOI10.1016/j.reactfunctpolym.2014.07.022
ISSN1381-5148
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S1381514814001588
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  • TERFIQ - Grup de Termodinàmica i Fisico-Química - Articles de revista [61]
  • Departament de Màquines i Motors Tèrmics - Articles de revista [429]
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