Correlations between gas permeation and free-volume hole properties of polyurethane membranes

被引：0

作者：

Wang, Zhi Fen ^{[1
]}

Wang, Bo ^{[1
]}

Yang, Yu Run ^{[2
]}

Hu, Chun Pu ^{[2
]}

机构：

[1] Department of Physics, Wuhan University, Wuhan 430072, China

[2] Inst. of Mat. Sci. and Engineering, E. China Univ. of Sci./Technology, Shanghai 200237, China

来源：

| 1600年 / Elsevier Ltd卷 / 39期

基金：

中国国家自然科学基金;

关键词：

Matrix algebra - Plastic films - Polymerization;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

A series of polyurethane films based on hard segments consisting of toluene diisocyanate and 1,4-butanediol and different soft segments consisting of hydroxyl terminated polybutadiene, hydroxyl terminated polybutadiene/styrene and hydroxyl terminated polybutadiene/acrylonitrile were synthesized by solution polymerization separately. Positron annihilation lifetimes were measured at room temperature for all samples studied. We found that both the free volume size and fractional free-volume decreased with the increase of hard segment content. On the other hand, direct relationship between the gas permeability and the free-volume has been established based on the free-volume parameters and gas diffusivity measured. Experimental results revealed that the free-volume plays an important role in determining the gas permeability. © 2003 Elsevier Ltd. All rights reserved.

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