Hygrothermal Aging Effects in Cured Epoxies

British Polymer Journal Pub Date : 1986-09-01 DOI:10.1002/PI.4980180505

J. A. Barrie, H. Rudd, P. Sagoo, P. Johncock

引用次数: 3

Abstract

The effect of relatively severe hygrothermal aging on the sorption and also the diffusion of water at 40°C has been studied for a number of epoxy networks comprising tetraglycidyl 4,4′-diaminodiphenyl methane, and the curing agent 4,4′-diaminodiphenyl sulphone, 4,4′-diaminodiphenyl methane and 2,2′-dichloro-4,4′-diaminodiphenyl methane. Aging at high temperatures is accompanied by a pronounced increase in sorptive capacity at 40°C consistent with a significant expansion of the network. Dry annealing of the aged network at sub- Tg temperatures collapses the expanded structure to recover the sorptive capacity of the unaged network. Preliminary studies of the sorption-desorption kinetics for aged networks indicate that the effective diffusion coefficient is not markedly affected.

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固化环氧树脂的湿热老化效应

在40℃条件下，研究了由四缩水甘油酯4,4′-二氨基二苯甲烷、固化剂4,4′-二氨基二苯砜、4,4′-二氨基二苯甲烷和2,2′-二氯4,4′-二氨基二苯甲烷组成的环氧树脂网络在相对严重的湿热老化下对水的吸附和扩散的影响。高温老化伴随着在40℃时吸附能力的显著增加，与网络的显著扩展相一致。在亚Tg温度下对老化网络进行干退火，使膨胀结构坍塌，恢复未老化网络的吸附能力。对老化网络吸附-解吸动力学的初步研究表明，有效扩散系数没有受到明显影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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British Polymer Journal

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