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Synthesis and properties of highly gas permeable poly(amide‐imide)s
Author(s) -
Fritsch Detlev,
Avella Nicola
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970224
Subject(s) - imide , chemistry , polymer chemistry , tetrahydrofuran , phthalic anhydride , condensation polymer , benzidine , trimellitic anhydride , chloride , dicarboxylic acid , polyamide , amide , organic chemistry , polymer , catalysis , solvent
Seven dicarboxylic acids containing one or two preformed imide rings were prepared by condensation of trimellitic anhydride with 3‐amino‐4‐methylbenzoic acid or with the diamines 2,4,6‐trimethyl‐1,3‐phenylenediamine, 3,3′‐dimethoxybenzidine, 3,3′,5,5′‐tetramethyl‐benzidine, 3,3′‐dimethyl‐1,1′‐binaphthalene or by condensation of 2,2‐hexafluoroisopropylidenebis(phthalic acid anhydride) (6FDA) with 2 mol of 3‐aminobenzoic acid or 3‐amino‐4‐methylbenzoic acid. Polycondensation was performed directly in N ‐methyl‐2‐pyrrolidone (NMP)/triphenyl phosphite/lithium chloride with oxydianiline, 2,2‐bis(4‐aminophenyl)‐perfluoropropane or 3,3′,5,5′‐tetramethylbenzidine. All the resulting polymers are soluble in NMP, some in tetrahydrofuran (THF) and could be cast to transparent, flexible and tough films. The helium permeability as a probe for diffusivity improves with increasing fluorine content and non‐linearity in the repeating unit.