CHARACTERIZATION AND GAS-PERMEABILITY OF A 3-COMPONENT POLYIMIDE SERIES

被引：30

作者：

CHUN, BW ^{[1
]}

ISHIZU, C ^{[1
]}

ITATANI, H ^{[1
]}

HARAYA, K ^{[1
]}

SHINDO, Y ^{[1
]}

机构：

[1] MINIST INT TRADE & IND,NATL CHEM LAB IND,TSUKUBA,IBARAKI 305,JAPAN

来源：

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 1994年 / 32卷 / 06期

关键词：

3-COMPONENT POLYIMIDES; GAS PERMEATION IN; PACKING DENSITY OF COPOLYIMIDES;

D O I：

10.1002/polb.1994.090320606

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Packing density and gas permeability of a three-component copolyimide series is presented. The three-component polyimides are prepared a via ''stepwise'' synthesis procedure that goes through the acid anhydride terminated pre-polymer. The procedure ensures the statistical distribution of segments of the polymers. The polyimide series is composed of contrasting segments: a bulky and rigid hexafluoroisopropylidene-2,2-bis(phthalic acid anhydride)/9,9,-bis(4-aminophenyl)fluorene and a flexible hexafluoroisopropylidene-2-2-bis(phthalic acid anhydride)/2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane,with varying segment ratio. Generation of additional free volume by copolymerizing two segments is observed. The permeability of six pure gases - He, H-2, N2, O2, CH4, and CO2 - to the polyimides showed positive deviation from the simple additivity rule of segment weight ratio reflecting the generation of free volume. However, a conflicting result between free volume fraction and gas permeability is observed, which may be due to a difference of the nature of free volume of each segment. (C) 1994 John Wiley & Sons, Inc.

引用

页码：1009 / 1016

页数：8