MEMBRANE FORMATION BY ISOTHERMAL PRECIPITATION IN POLYAMIDE FORMIC-ACID WATER-SYSTEMS .1. DESCRIPTION OF MEMBRANE MORPHOLOGY

被引:67
作者
CHENG, LP
DWAN, AH
GRYTE, CC
机构
[1] TAMKANG UNIV,DEPT CHEM ENGN,TAIPEI,TAIWAN
[2] COLUMBIA UNIV,DEPT CHEM ENGN MAT SCI & MIN ENGN,NEW YORK,NY 10027
关键词
MEMBRANE; POLYAMIDES; NYLON-66; IMMERSION PRECIPITATION; MICROPOROUS MEMBRANE;
D O I
10.1002/polb.1995.090330206
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Aliphatic polyamides (Nylon-66 and a Nylon-6, -66, -610 terpolymer) were isothermally precipitated from formic acid solution by immersing in an aqueous nonsolvent bath or a solvent/nonsolvent mixture. Depending on the composition of the polymer solution and nonsolvent bath, phase separation by nucleation and growth can be initiated for a liquid-liquid phase separation process, a crystallization process or a combined process. Under certain conditions, crystallization of Nylon-66 results in a membrane with a uniform skinless microporous structure that was rapidly wetted by water. In contrast, liquid-liquid phase separation produces a polyamide film with largely unconnected cellular voids that is as a result not wetted by water. (C) 1995 John Wiley and Sons, Inc.
引用
收藏
页码:211 / 222
页数:12
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