Curing behaviors and kinetics of epoxy resins with a series of biphenyl curing agents having different methylene units
Curing behaviors and kinetics of epoxy resins with a series of biphenyl curing agents having different methylene units
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DOI：
10.1016/j.tca.2011.03.036
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发表时间：
2011-07-10
影响因子：
3.5
通讯作者：
Zhang, Yuying
中科院分区：
文献类型：
--
作者：
Wang, Haimei;Zhang, Yuechao;Zhang, Yuying
合成了一系列含联苯基和n-亚甲基（n = 2，4，6）的固化剂（LCCAN）。采用动态DSC研究了双酚A二缩水甘油醚（DGEBA）环氧树脂与LCCAN的固化行为，并与工业联苯型固化剂4，4 '-二氨基联苯（DABP）进行了比较。结果表明，LCCAN固化体系比DABP固化体系具有更高的化学反应活性和更低的玻璃化转变温度。采用等转化率法研究了该体系在等温和非等温条件下的固化动力学，并采用自催化固化模型对等温DSC数据进行了合理的拟合。POM研究表明，DGEBA/LCCAn体系的固化样品呈现液晶转变，而DABP体系的固化样品呈现各向同性，表明亚甲基单元在液晶相的形成中起着关键作用。(C)2011爱思唯尔有限公司版权所有。
A series of curing agents (LCCAn) bearing biphenyl group and n-methylene units (n =2,4 and 6) were synthesized. The curing behaviors of epoxy resin based on diglycidyl ether of bisphenol A (DGEBA) with LCCAn were investigated in comparison with commercial biphenyl type curing agent 4,4'-diaminobiphenyl (DABP) by dynamic DSC. The results indicated that LCCAn curing systems showed higher chemical reactivity and lower glass transition temperatures than DABP system. The kinetics was studied under isothermal and non-isothermal conditions using isoconversional methods, and the isothermal DSC data can be fitted reasonably by an autocatalytic curing model. POM studies revealed that the cured samples of DGEBA/LCCAn systems showed liquid crystalline transitions while DABP curing system displayed an isotropic state, which indicated that methylene units played a key rule for the formation of liquid crystalline phases. (C) 2011 Elsevier B.V. All rights reserved.