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LC Polyimides 29. Non-Crystalline Cholesteric Copoly(Ester-Imide)s Derived from Adipic Acid and Isosorbide

Thorsten Krawinkel

Institut für Technische und Makromolekulare Chemie der Universität Hamburg, Bundesstrasse 45, D-20146 Hamburg, Germany

Numerous cholesteric copoly(ester-imide)s were prepared from mixtures of isosorbide and tert.-buthylhydroquinone (or other diphenols), on the one hand, and mixtures of adipoylchloride and N-(4-chlorocarbonylphenyl) trimellitimide chloride on the other. When the molar ratio of isosorbide/diphenol was varied, Grandjean textures were only observed for low concentrations of isosorbide (5/95 or 10/90). In the case of adipoylchloride/imide dichloride molar ratios of 30/70–50/50 favoured the formation of Grandjean textures. Most copoly(esterimide)s were non-crystalline with glass transition temperatures (T_gs) between 90 and 190 °C. In several cases the Grandjean textures were frozen in by cooling below T_g. Such copoly(esterimide)s may be useful as pigments. All copoly(ester-imide)s containing methylhydroquinone were semicrystalline with melting temperatures in the range of 240–270 °C.

High Performance Polymers, Vol. 9, No. 2, 91-104 (1997)
DOI: 10.1088/0954-0083/9/2/002


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