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Polyimidines. XI. Polyimidines from 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and 4,4′-(hexafluoroisopropylidene) diphthalic anhydride

✍ Scribed by Maryanne Mores; Patrick E. Cassidy

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
670 KB
Volume
28
Category
Article
ISSN
0887-624X

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✦ Synopsis

Abstract

Two new bis(benzylidenephthalide)monomers were synthesized by melt condensation of phenylacetic acid with 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride (BTDA) and with 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride (6FDA). A mixture of three isomers for each monomer was obtained and polymerized with diamines to produce new polyimidines. Polymerizations were conducted with m‐xylylenediamine (MXDA) or 4,4′‐oxydianiline (ODA) in quantitative yields for the undehydrated intermediate. Inherent viscosities ranged from 0.17 to 0.35 dL/g in N,N‐dimethylformamide (DMF) or N‐methyl‐2‐pyrrolidone (NMP). These intermediate poly(hydroxylactams) were thermally dehydrated to polyimidines which exhibited a 10% weight loss, as high as 546°C in nitrogen. Inherent viscosities of the dehydrated (cured) polyimidines ranged from 0.14 to 0.20 dL/g in NMP. Brittle films could be cast from NMP solutions.

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