Epoxy resins modified with poly(vinyl acetate)

被引:11
|
作者
Lapprand, A
Arribas, C [1 ]
Salom, C
Prolongo, MG
机构
[1] Univ Politecn Madrid, ETSI Aeronaut, Madrid, Spain
[2] Univ Politecn Madrid, EUIT Aeronaut, Madrid, Spain
关键词
epoxy resin; DGEBA; poly(vinyl acetate); curing; differential scanning calorimetry;
D O I
10.1016/S0924-0136(03)00356-X
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Miscibility and curing behaviour have been studied in blends of poly(vinyl acetate) (PVAc) with diglycidyl ether of bisphenol A (DGEBA) resin and 4,4'-diaminodiphenylsulphone (DDS) used as curing agent. The PVAc component was used as a potential toughness modifier. Binary mixtures DGEBA + PVAc show complete miscibility over the whole composition range. Ternary mixture DGEBA + DDS in stoichiometric ratio +10% (w/w) PVAc behaves also as homogeneous phase. However PVAc was found to be inmmiscible with the highly amine-cross-linked epoxy resin. It was found that phase separation in DGEBA + DDS + PVAc blends occurred as the conversion reaches a value close to 40%. In the final cured material two phases are present: an epoxy phase and a PVAc phase. It was also found a slow down of the reaction when PVAc was present. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:827 / 831
页数:5
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