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Structure/permeability and permselectivity relationship of polyetherimides from 1,4‐bis(3,4‐dicarboxyphenoxy) benzene dianhydride. I
Author(s) -
Li Yuesheng,
Ding Mengxian,
Xu Jiping
Publication year - 1996
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199605)40:1<57::aid-pi516>3.0.co;2-6
Subject(s) - benzene , semipermeable membrane , permeability (electromagnetism) , thermal stability , materials science , gas separation , chemistry , polymer chemistry , polyetherimide , membrane , chemical engineering , organic chemistry , polymer , biochemistry , engineering
Gas permeability coefficients of a series of aromatic polyetherimides, which were prepared from 1,4‐bis(3,4‐dicarboxyphenoxy) benzene dianhydride (HQDPA) and various aromatic diamines, to H 2 , CO 2 , O 2 , N 2 and CH 4 have been measured under 7 atm pressure and over the temperature range 30–150°C. A significant change in permeability and permselectivity, which resulted from a systematic variation in chemical structure of the polyetherimides, was found. Generally, increases in permeability of the polyetherimides are accompanied by decreases in permselectivity. The order of decrease of the permeability coefficients is as follows: HQDPA–IPDA > HQDPA–DDS > HQDPA–MDA > HQDPA–ODA > HQDPA–DABP > HQDPA–BZD. However, HQDPA–DMoBZD and HQDPA–DMoMDA, with bulky methoxy side‐groups on the aromatic rings of the diamine residue, display both high permeability coefficients and high permselectivity. The favourable gas separation property, excellent thermal and chemical stability, and high mechanical strength make HQDPA–DMoBZD and HQDPA–DMoMDA promising candidates for membrane‐based gas separation applications.