MICROSTRUCTURES IN PHASE-INVERSION MEMBRANES .1. FORMATION OF MACROVOIDS

被引：800

作者：

SMOLDERS, CA

REUVERS, AJ

BOOM, RM

WIENK, IM

机构：

[1] Department of Chemical Technology, University of Twente, 7500 AE Enschede

来源：

JOURNAL OF MEMBRANE SCIENCE | 1992年 / 73卷 / 2-3期

关键词：

MEMBRANE PREPARATION AND STRUCTURE; THEORY; THERMODYNAMICS; MACROVOIDS; PHASE-INVERSION MEMBRANES;

D O I：

10.1016/0376-7388(92)80134-6

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A new mechanism for the formation of macrovoids in phase-inversion membranes is proposed. It is based on the observed difference in type of demixing of a thin film of a polymer solution when immersed in a nonsolvent bath: delayed or instantaneous demixing. The explanation for macrovoid formation assumes local conditions of delayed demixing in front of a certain layer of nuclei already formed, due to a change in interfacial compositions at the advancing coagulation front, as compared to the original composition at the interface film-bath. Effects of variations in membrane formation conditions which can be calculated using the model of diffusive mass transport in thin films of polymeric solutions in combination with phase separation in phase-inversion membranes, completely support the mechanism as proposed.

引用

页码：259 / 275

页数：17

共 25 条

[1] CALCULATION OF LIQUID LIQUID-PHASE SEPARATION IN A TERNARY-SYSTEM OF A POLYMER IN A MIXTURE OF A SOLVENT AND A NONSOLVENT [J].