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Catalysts for the preparation of polybenzimidazoles
Author(s) -
Choe EuiWon
Publication year - 1994
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.1994.070530504
Subject(s) - isophthalic acid , catalysis , polymer chemistry , reverse osmosis , condensation polymer , polymer , materials science , polymerization , condensation , phenylene , membrane , chemistry , chemical engineering , organic chemistry , polyester , terephthalic acid , biochemistry , physics , engineering , thermodynamics
The single‐stage preparation of poly[2,2′‐( m ‐phenylene)‐5,5′‐bibenzimidazole] (PBI), from 3,3′,4,4′‐tetraaminobiphenyl (TAB) with isophthalic acid (IPA) in the presence of a catalyst, was explored and developed. The effects of a variety of catalysts on the polymerization of TAB with IPA and/or diphenyl isophthalate were screened and evaluated. Many organo phosphorus and silicon compounds catalyzed the PBI condensation reactions, increased the molecular weight, and improved the quality of PBI polymers. Fiber and reverse osmosis membrane properties of PBI prepared from TAB and IPA were comparable to those for commercial standard PBI prepared from TAB and diphenyl isophthalate. © 1994 John Wiley & Sons, Inc.