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New epoxy thermosets obtained from diglycidylether of bisphenol a and modified hyperbranched polyesters with long aliphatic chains cured by diisocyanates

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10.1002/pen.23225
 
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hdl:2117/19728

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Flores Guillen, Marjorie
Fernández Francos, XavierMés informacióMés informacióMés informació
Jiménez Piqué, EmilioMés informacióMés informacióMés informació
Foix, David
Serra Albet, Maria ÀngelsMés informació
Ramis Juan, XavierMés informacióMés informacióMés informació
Document typeArticle
Defense date2012
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
Hyperbranched polyesters modified with long aliphatic chains with vinyl or epoxy groups as chain ends were synthesized and added as modifiers to diglycidyl ether of bisphenol A/toluene-2,4-diisocyanate mixtures in the presence of benzyldimethylamine as catalyst. The influence of the addition of these modifiers on the curing was investigated by thermal analysis and infrared spectroscopy. The materials obtained were investigated by electron microscopy and some mechanical characteristics were determined by nanoindentation tests. Epoxy terminated hyperbranched led to homogeneous materials with high crosslinking densities, whereas vinyl terminated hyperbranched produced phase separated morphologies. The materials showing phase separation presented a tough fracture, whereas the homogeneous materials obtained with epoxidated hyperbranched showed increased brittleness on increasing the proportion of modifier. On increasing the proportion of vinyl terminated hyperbranched in the thermosets, Young’s modulus and hardness decreased but the addition of epoxy terminated hyperbranched did not influence these parameters. The addition of vinylic hyperbranched to the formulations produced a decrease in the curing shrinkage, whereas the epoxidic hyperbranched did not.
CitationFlores, M. [et al.]. New epoxy thermosets obtained from diglycidylether of bisphenol a and modified hyperbranched polyesters with long aliphatic chains cured by diisocyanates. "Polymer engineering and science", 2012, vol. 52, núm. 12, p. 2597-2610. 
URIhttp://hdl.handle.net/2117/19728
DOI10.1002/pen.23225
ISSN0032-3888
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  • TERFIQ - Grup de Termodinàmica i Fisico-Química - Articles de revista [61]
  • Departament de Ciència dels Materials i Enginyeria Metal·lúrgica - Articles de revista [961]
  • CIEFMA - Centre d'Integritat Estructural, Fiabilitat i Micromecànica dels Materials - Articles de revista [283]
  • Departament de Màquines i Motors Tèrmics - Articles de revista [429]
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