Water vapor transport in liquid crystalline and non-liquid crystalline epoxies

被引：1

作者：

Jianxun Feng

K. R. Berger

E. P. Douglas

机构：

[1] University of Florida,Department of Materials Science & Engineering

[2] University of Florida,Agricultural & Biological Engineering Department

来源：

Journal of Materials Science | 2004年 / 39卷

关键词：

Permeability; Epoxy; Water Vapor; Barrier Property; Moisture Transport;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

This paper presents a comparison of moisture permeation in liquid crystalline and non-liquid crystalline epoxy systems. The permeability is obtained using a dynamic method. It is found that diffusion in both epoxy systems is Fickian. The liquid crystalline epoxy network exhibits higher barrier properties to moisture transport than the conventional epoxy network. The efficient chain packing of the smectic mesophase of the liquid crystalline epoxy is the main factor for this difference. The stoichiometry has a large effect on the moisture permeation. The diffusion coefficient decreases monotonically with increasing amine/epoxide functional ratio. The permeability (P) and solubility coefficient (S) reach a minimum for a functional ratio of one. The results are described on the basis of hydrogen bonding of water to the epoxy network and the two phase morphology of cured epoxies.

引用

页码：3413 / 3423

页数：10

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