Barrier membranes with different sizes of aligned flakes

被引：93

作者：

DeRocher, JP ^{[1
]}

Gettelfinger, BT ^{[1
]}

Wang, JS ^{[1
]}

Nuxoll, EE ^{[1
]}

Cussler, EL ^{[1
]}

机构：

[1] Univ Minnesota, Minneapolis, MN 55455 USA

来源：

JOURNAL OF MEMBRANE SCIENCE | 2005年 / 254卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

permeability; polyvinyl alcohol; flake;

D O I：

10.1016/j.memsci.2004.12.025

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The permeability of polymer films can be reduced dramatically with many layers of thin mineral flakes aligned parallel to the film's surface. For a film with a volume fraction phi of flakes of aspect ratio alpha, the permeability reduction is expected to be proportional to alpha phi for the dilute limit (phi << 1 and alpha phi < 1) but proportional to (alpha phi)(2) in the semi-dilute limit (phi << 1 but alpha phi > 1). Permeabilities of hydrochloric acid and sodium hydroxide across films containing mica or vermiculite in polyvinyl alcohol agree with the second, semi-dilute prediction. Permeabilities of helium across films of montmorillonite in polyethylene glycol do as well. These improvements in barrier properties are independent of flake size, permeant and polymer chemistry. (c) 0 2005 Elsevier B.V. All rights reserved.

引用

页码：21 / 30

页数：10

共 27 条

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