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Gas Permeation Properties ofCopolyimides from1,4-Bis(3,4-dicarboxyphenoxy)benzeneDianhydride and 2,2-Bis(3,4-dicarboxyphenyl)hexafluoroisopropaneDianhydride

✍ Scribed by Li, Yuesheng; Ding, Mengxian; Xu, Jiping

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
330 KB
Volume
42
Category
Article
ISSN
0959-8103

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✦ Synopsis

A series of aromatic copolyimides was prepared from 1,4-bis(3,4dicarboxyphenoxy)benzene dianhydride (HQDPA) and 2,2-bis(3,4-dicarboxyphenyl)hexaÑuoroisopropane dianhydride (6FDA) with 3,3@-dimethyl-4,4@-methylene dianiline (DMMDA) by a chemical imidization. The gas permeability coefficients of the copolyimides to and were measured under H 2 , CO 2 , O 2 , N 2 CH 4 7 atm. pressure. The fractional free volume of 6FDAÈDMMDA is larger than that of HQDPAÈDMMDA, while the chain segmental mobility of 6FDAÈ DMMDA is lower than that of HQDPAÈDMMDA. The gas permeability of 6FDAÈDMMDA is much higher than that of HQDPAÈDMMDA but the permselectivity of 6FDAÈDMMDA for over is lower than

CH 4 that of HQDPAÈDMMDA. The experimental values of the gas permeability coefficients of the copolyimides are in satisfactory agreement with the values estimated from the gas permeability coefficients of the constituent homopolyimides and their weight fractions.

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