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Synthesis and properties of ortho-linked aromatic polyimides based on 1,2-bis(4-aminophenoxy)-4-tert-butylbenzene

✍ Scribed by Sheng-Huei Hsiao; Chin-Ping Yang; Shin-Hung Chen

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 141 KB
Volume: 38
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(20000501)38:9<1551::aid-pola19>3.0.co;2-o

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✦ Synopsis

A bis(ether amine) containing the ortho-substituted phenylene unit and pendant tert-butyl group, 1,2-bis(4-aminophenoxy)-4-tert-butylbenzene, was synthesized and used as a monomer to prepare polyimides with six commercial dianhydrides via a conventional two-stage procedure. The intermediate poly(amic acid)s had inherent viscosities of 0.78 -1.44 dL/g, and most of them could be thermally converted into transparent, flexible, and tough polyimide films. The inherent viscosities of the resulting polyimides were in the range of 0.46 -0.87 dL/g. All polyimides were noncrystalline, and most of them showed excellent solubility in polar organic solvents. The glasstransition temperatures of these polyimides were in the range of 222-259 °C in differential scanning calorimetry and 212-282 °C in thermomechanicl analysis. These polyimides showed no appreciable decomposition up to 500 °C in thermogravimetric analysis in air or nitrogen. A comparative study of the properties with the corresponding polyimides without pendant tert-butyl groups derived from 1,2-bis(4-aminophenoxy)benzene is also presented.

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