Curing behaviors and properties of an extrinsic toughened epoxy/anhydride system and an intrinsic toughened epoxy/anhydride system
Curing behaviors and properties of an extrinsic toughened epoxy/anhydride system and an intrinsic toughened epoxy/anhydride system
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外在增韧环氧/酸酐体系和内在增韧环氧/酸酐体系的固化行为和性能
DOI：
10.1016/j.tca.2012.12.007
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发表时间：
2013-02-20
影响因子：
3.5
通讯作者：
Zhang, Junying
中科院分区：
文献类型：
--
作者：
Fan, Mengjin;Liu, Jialin;Zhang, Junying
以六氢邻苯二甲酸酐(HHPA)为固化剂，三二甲氨基甲基苯酚(DMP-30)为促进剂，采用非等温DSC方法，采用模型拟合法和Vyazovkin改进等转化法，对外加韧环氧树脂(双酚A二缩水甘油醚和1，4-丁二醇环氧树脂混合物，DGEBA/DGEBD)和本征增韧环氧树脂(含两个氧乙烯单元的乙氧基化双酚A环氧树脂，DGEBAEO-2)的固化动力学进行了对比研究。用DMTA和TGA研究了固化材料的动态力学性能和热稳定性。结果表明，Sestak-Berggren模型能较好地模拟这两个体系的反应速率。DGEBA/DGEBD/HHPA/DMP-30在高转化率下的反应活化能明显高于DGEBAEO-2/HHPA/DMP-30，表明空间位阻的增加主要影响了DGEBA/DGEBD/HHPA/DMP-30的反应动力学过程。DMTA分析表明，DGEBAEO-2/HHPA/DMP-30固化体系的T-g和储能模量均低于DGEBA/DGEBD/HHPA/DMP-30固化体系，而热重分析表明两种固化体系的热稳定性相似。(C)2012爱思唯尔B.V.保留所有权利。
The curing kinetics of an extrinsic toughened epoxy (mixture of diglycidyl ether of bisphenol-A and 1,4-butanediol epoxy resin, DGEBA/DGEBD) and an intrinsic toughened epoxy (ethoxylated bisphenol-A epoxy resin with two oxyethylene units, DGEBAEO-2) using hexahydrophthalic anhydride (HHPA) as curing agent and tris-(dimethylaminomethyl) phenol (DMP-30) as accelerator were comparatively studied by non-isothermal DSC with a model-fitting Malek approach and a model-free advanced isoconversional method of Vyazovkin. The dynamic mechanical properties and thermal stabilities of the cured materials were investigated by DMTA and TGA, respectively. The results showed that Sestak-Berggren model can generally simulate well the reaction rates of these two systems. The activation energy of DGEBA/DGEBD/HHPA/DMP-30 at high fractional conversion changed much higher than that of DGEBAEO-2/HHPA/DMP-30, indicating the increased steric hindrance mainly affected the reaction kinetic scheme of DGEBA/DGEBD/HHPA/DMP-30. The T-g and storage moduli of cured DGEBAEO-2/HHPA/DMP-30 were lower than those of cured DGEBA/DGEBD/HHPA/DMP-30 according to DMTA while TGA showed that the thermal stabilities of these two cured systems were similar. (C) 2012 Elsevier B.V. All rights reserved.