Kinetics of water vapor sorption in sulfonated polyimide membranes

被引：42

作者：

Detallante, V

Langevin, D ^{[1
]}

Chappey, C

Métayer, M

Mercier, R

Pinéri, M

机构：

[1] Univ Rouen, CNRS, UMR 6522, UFR Sci,Lab Polymeres, F-76821 Mont St Aignan, France

[2] CNRS, UMR 5041, Lab Mat Organ Proprietes Specif, F-69390 Vernaison, France

[3] CEA Grenoble, SCPM, Dept Etud Mat, F-38054 Grenoble, France

来源：

DESALINATION | 2002年 / 148卷 / 1-3期

关键词：

water sorption; kinetics; clustering; ionomers; sulfonated polyimides; fuel cell membranes;

D O I：

10.1016/S0011-9164(02)00726-9

中图分类号：

TQ [化学工业];

学科分类号：

0817 [化学工程与技术];

摘要：

Water vapour sorption kinetics in a H+ form naphtalenic sulfonated polyimide membrane at 25degreesC has been investigated by using an electronic microbalance (IGA, Hiden). An effective diffusion coefficient D-exp has been calculated from kinetic data by using the Fickian model for the final part of the sorption. The variation of D-exp with the equilibrium water activity (0<a(wequi)<1) has been analysed considering the different sorption modes involved. The increase of D-exp with increasing a(wequi) at low activities is explained on the basis of a dual mode (Henry-Langmuir) sorption model whereas the decrease of D-exp for the higher activities calls for the reduced mobility of water involved in the dilution of multiplets and for the immobilization of sorbed water by clustering.

引用

页码：333 / 339

页数：7

共 11 条

[1]

Facilitation of transport in ion-exchanger membranes illustrated by a situation with monoprotonated ethylenediamine as the transporter [J].