期刊
REACTIVE & FUNCTIONAL POLYMERS
卷 72, 期 9, 页码 556-563出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.reactfunctpolym.2012.05.008
关键词
Epoxy; Anhydride; Aromatic-aliphatic polyester; Hyperbranched; Toughness
资金
- MINECO (Ministerio de Economia y Competitividad)
- FEDER (Fondo Europeo de Desarrollo Regional) [MAT2011-27039-C03-01, MAT2011-27039-C03-02]
- Comissionat per a Universitats i Recerca del DIUE de la Generalitat de Catalunya [2009-SGR-1512]
- grant FPI-DGR from the Catalonian Government
The synthesis and characterization of two new aromatic-aliphatic hyperbranched polyesters modified with long and short vinylic chains was reported. These hyperbranched polymers were used as toughening modifiers of epoxy/anhydride thermosets. The curing of mixtures of diglycidyl ether of bisphenol A and hexahydro-4-methylphtalic anhydride with different proportions of both hyperbranched polymers using N,N-benzyldimethylamine as catalyst was investigated by differential scanning calorimetry. The kinetic of curing process was established using an isoconversional integral procedure. The characterization of these materials was done by means of several thermal analysis techniques and their morphology was investigated by electron microscopy. The addition of highly branched structures led to homogeneous morphologies and a more toughening fracture of the thermosets in comparison to the neat epoxy/anhydride material. The modified thermosets presented slightly lower glass transition temperature than the unmodified one and the thermal stability barely changed by the addition of the modifiers. (c) 2012 Elsevier Ltd. All rights reserved.
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