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Preparation and properties of new soluble aromatic polyimides from 2,2′-bis(3,4-dicarboxyphenoxy)biphenyl dianhydride and aromatic diamines

✍ Scribed by Guey-Sheng Liou; Masaki Maruyama; Masa-Aki Kakimoto; Yoshio Imai

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
145 KB
Volume
36
Category
Article
ISSN
0887-624X

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✦ Synopsis

A new aromatic tetracarboxylic dianhydride having a crank and twisted noncoplannar structure, 2,2Ј-bis(3,4-dicarboxyphenoxy)biphenyl dianhydride, was synthesized by the reaction of 4-nitrophthalonitrile with biphenyl-2,2Ј-diol, followed by hydrolysis and cyclodehydration. The biphenyl-2,2Ј-diyl-containing aromatic polyimides having inherent viscosities up to 0.66 dL/g were obtained by the conventional two-step procedure starting from the dianhydride monomer and various aromatic diamines. Most of the polyimides were readily soluble in amide-type solvents such as N,N-dimethylacetamide and N-methyl-2-pyrrolidone. The aromatic polyimides had glass transition temperatures in the range of 205-242°C, and began to lose weight around 415°C, with 10% weight loss being recorded at about 500°C in air.

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