Fracture mechanism of liquid-crystalline epoxy resin system with different phase structures

被引：28
作者：
Harada, M [1 ]
Aoyama, K [1 ]
Ochi, M [1 ]
机构：
[1] Kansai Univ, Fac Engn, Dept Appl Chem, Suita, Osaka 5458680, Japan
来源：
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 2004年 / 42卷 / 22期
关键词：
crosslinking; fracture; orientation;
D O I：
10.1002/polb.20249
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 liquid-crystalline epoxy resin was cured at two different temperatures. The phases of the cured systems clearly showed isotropic and nematic polydomain structures, which depended on the curing temperature. The fracture toughness of the systems was measured, and the fracture mechanism was investigated with polarized IR measurements. The nematic polydomain structure system showed considerably higher fracture toughness than the isotropic structure. Moreover, both systems exhibited a reorientation of the network chains near the fracture surface during the fracture process, and the region of the network reorientation in the nematic polydomain structure system was larger than that in the isotropic structure system. (C) 2004 Wiley Periodicals, Inc.
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收藏
页码：4044 / 4052
页数：9
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