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

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 investiga...

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Veröffentlicht in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2004-11, Vol.42 (22), p.4044-4052
Hauptverfasser: Harada, Miyuki, Aoyama, Kentaro, Ochi, Mitsukazu
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container_title Journal of polymer science. Part B, Polymer physics
container_volume 42
creator Harada, Miyuki
Aoyama, Kentaro
Ochi, Mitsukazu
description 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. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 4044–4052, 2004
doi_str_mv 10.1002/polb.20249
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subjects Applied sciences
crosslinking
Exact sciences and technology
fracture
Mechanical properties
Organic polymers
orientation
Physicochemistry of polymers
Properties and characterization
title Fracture mechanism of liquid-crystalline epoxy resin systems with different phase structures
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