A METHOD FOR DETERMINING INTRINSIC DIFFUSION-COEFFICIENTS IN THE PERVAPORATION PROCESS

被引：4
|
作者：
WALCHER, T
GORITZ, D
机构：
[1] Institut für Angewandte Physik, University of Regensburg, Regensburg, 93053
来源：
MACROMOLECULAR CHEMISTRY AND PHYSICS | 1995年 / 196卷 / 01期
关键词：
D O I：
10.1002/macp.1995.021960131
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
An apparatus based on a differential gas-chromatographic detection system was designed in order to obtain information about the average permeation coefficient for pervaporation (PVAP) of pure liquids through isotactic poly(propylene) (i-PP). The non-ideal concentration dependence of diffusivity D prevents one from solving the diffusion equations exactly. Therefore, a method has been developed to obtain information on the intrinsic diffusion coefficient D-0 and the plasticisation parameter gamma for the two-parameter function D(c) used. In addition, the concentration profile of the liquid in the membrane can be evaluated.
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页码：429 / 439
页数：11
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