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New epoxy thermosets modified with multiarm star poly(lactide) with poly(ethyleneimine) as core of different molecular weight

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10.1016/j.eurpolymj.2013.05.015
 
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hdl:2117/26839

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Acebo Gorostiza, Cristina
Fernández Francos, XavierMés informacióMés informacióMés informació
Ferrando Piera, FrancescMés informació
Serra Albet, Maria ÀngelsMés informació
Ramis Juan, XavierMés informacióMés informacióMés informació
Document typeArticle
Defense date2013-08
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
Multiarm stars containing a hyperbranched poly(ethyleneimine) core of different molecular weight and poly(lactide) arms were synthesized by cationic ring-opening polymerization of lactide from a hyperbranched poly(ethyleneimine) core. After characterization by rheometry, calorimetry, thermogravimetry and nuclear magnetic resonance, these polymers were used as chemically modifiers in the anionic curing of diglycidylether of bisphenol A epoxy resin. The curing process was studied by dynamic scanning calorimetry, demonstrating the influence of the mobility of the reactive species and the hydroxyl content on the curing kinetics. The resulting materials were characterized by thermal and mechanical tests. The addition of the multiarm stars led to homogeneous materials with a slight improvement on the impact strength in comparison with the neat material, without compromising the glass transition temperature. The reworkable nature of the materials was demonstrated by monitoring the changes in their glass transition under thermal rework conditions.
CitationAcebo, C. [et al.]. New epoxy thermosets modified with multiarm star poly(lactide) with poly(ethyleneimine) as core of different molecular weight. "European polymer journal", Agost 2013, vol. 49, núm. 8, p. 2316-2326. 
URIhttp://hdl.handle.net/2117/26839
DOI10.1016/j.eurpolymj.2013.05.015
ISSN0014-3057
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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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