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New poly(amide–imide)s syntheses. XXIII. Synthesis and properties of poly(amide–imide)s derived from 4,4′-[1,4-phenylenebis(isopropylidene-1,4-phenyleneoxy)]dianiline and various bis(trimellitimide)s

✍ Scribed by Chin-Ping Yang; Sheng-Huei Hsiao; Hsiu-Chun Hsiao

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 156 KB
Volume: 37
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(19990101)37:1<69::aid-pola8>3.0.co;2-4

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✦ Synopsis

A series of poly(amide-imide)s III a-m containing flexible isopropylidene and ether groups in the backbone were synthesized by the direct polycondensation of 4,4Ј-[1,4-phenylenebis(isopropylidene-1,4-phenyleneoxy)]dianiline (PIDA) with various bis(trimellitimide)s II a-m in N-methyl-2-pyrrolidone (NMP) using triphenyl phosphite and pyridine as condensing agents. The resulting poly(amide-imide)s had inherent viscosities in the range of 0.80 -1.36 dL/g. Except for those from the bis(trimellitimide)s of p-phenylenediamine and benzidine, all the polymers could be cast from DMAc into transparent and tough films. They exhibited excellent solubility in polar solvents. The 10% weight loss temperatures of the polymers in air and in nitrogen were all above 495°C, and their T g values were in the range of 201-252°C. Some properties of poly(amide-imide)s III were compared with those of the corresponding poly(amideimide)s V prepared from the bis(trimellitimide) of diamine PIDA and various aromatic diamines.

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