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Synthesis, characterization, and gas permeability of aromatic polyimides containing pendant phenoxy group
Author(s) -
Kothawade Sandeep S.,
Kulkarni Mahesh P.,
Kharul Ulhas K.,
Patil Anandrao S.,
Vernekar Subhash P.
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28074
Subject(s) - pyromellitic dianhydride , polyimide , polymer chemistry , diamine , nitrobenzene , materials science , glass transition , polymer , dimethylacetamide , solubility , solvent , chemistry , organic chemistry , layer (electronics) , catalysis
A diamine containing a pendant phenoxy group, 1‐phenoxy‐2,4‐diaminobenzene, was synthesized and condensed with different aromatic dianhydrides [4,4′‐oxydiphthalic dianhydride, 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride, 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride, 3,3′,4,4′‐biphenyltetracorboxylic dianhydride, and pyromellitic dianhydride] by one‐step synthesis at a high temperature in m ‐cresol to obtain polyimides in high yields. Most of the polyimides exhibited good solvent solubility and could be readily dissolved in chloroform, sym ‐tetrachloroethane, N,N ‐dimethylformamide, N,N ‐dimethylacetamide, and nitrobenzene. Their inherent viscosities were in the range of 0.33–1.16 dL/g. Wide‐angle X‐ray spectra revealed that these polymers were amorphous in nature. All these polyimides were thermally stable, having initial decomposition temperatures above 500°C and glass‐transition temperatures in the range of 248–281°C. The gas permeability of 4,4′‐oxydiphthalic dianhydride and 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride based polyimides was investigated with pure gases: He, H 2 , O 2 , Ar, N 2 , CH 4 , and CO 2 . A polyimide containing a C(CF 3 ) 2 linkage showed a good combination of permeability and selectivity. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008