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Preparation and thermal properties of semi-rigid homo- and copoly(imide-carbonate)s based on 4,4′-oxydiphthalimide

✍ Scribed by Moriyuki Sato; Tomohiro Hirata; Seiji Ujiie

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
490 KB
Volume
197
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

New aromatic‐aliphatic semi‐rigid homo‐ and copoly(imide‐carbonate)s 7 containing the 4,4′‐oxydiphthalimide ring system were prepared by melt polycondensation of N,N′‐bis(6‐hydroxyhexyl)‐4,4′‐oxydiphthalimide (4) and/or 6,6′‐(4,4′‐biphenyldiyldioxy)dihexanol (5) with hexamethylene diphenyl dicarbonate in the presence of zinc acetate, and their thermal and mesomorphic properties were evaluated. The assigned structures of the monomer and the polymers were identified by Fourier‐transform infrared and ^13^C nuclear magnetic resonance spectroscopy and elemental analyses. Differential scanning calorimetry measurements, observation of the texture by means of a polarizing microscope equipped with a hot stage and powder X‐ray analyses at various temperatures demonstrated that only the biphenyl moiety‐rich polymers from nematic phases, but the 4,4′‐oxydiphthalimide moiety‐rich polymers exhibit no liquid‐crystalline melts. It was suggested that the mesogenic character of the 4,4′‐oxydiphthalimide ring system is low. The glass transition temperature steps decrease with the biphenyl moiety content. Thermogravimetry/differential thermal analysis (TG‐DTA) measurements indicated that the polymers are thermostable up to 300°C in air.

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