ISSN:
1022-1352
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
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.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1996.021970224
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