A study on the properties of epoxy resin toughened by a liquid crystal-type oligomer

被引：0
|
作者：
Zhang, BL [1 ]
Tang, GL [1 ]
Shi, KY [1 ]
You, YC [1 ]
Du, ZJ [1 ]
Huang, JF [1 ]
机构：
[1] Nankai Univ, Dept Chem, State Key Lab Funct Polymer Mat Adsorpt & Separat, Tianjin 300071, Peoples R China
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 1999年 / 71卷 / 01期
关键词：
epoxy resin; toughening; morphology;
D O I：
10.1002/(SICI)1097-4628(19990103)71:1<177::AID-APP20>3.0.CO;2-P
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A series of novel reactive toughening agents (LCEUPPG) containing both a flexible spacer and rigid liquid crystalline unit were synthesized to modify the bisphenol epoxy resin/dicyandiamide curing system. The curing reactivity, apparent activation energy, curing mechanism, dynamic mechanical behavior, and impact strength of the modified system were systematically studied. Compared with the unmodified system, the results indicate that LCEUPPG have greatly accelerated the curing reaction between epoxy resin and dicyandiamide, reduced the apparent activation energy of the curing reaction, enhanced the impact strength 3-7 times, and maintained high dynamic modulus and good thermal properties. In addition, SEM observation of the fracture surfaces showed a two-phase microstructure in the modified systems. (C) 1999 John Wiley & Sons, Inc.
引用
收藏
页码：177 / 184
页数：8
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