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LC Polyimides 31. Non-Crystalline Cholesteric Poly(Ester-Imide)s Based on Isosorbide and 1,6-Hexanediol

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 by polycondensation of N-(4-carboxyphenyl)trimellitimide (in the form of the dichloride) with isosorbide and various diphenols. 1, 6-hexanediol was incorporated as a flexibilizing component in various molar ratios. In two cases 1, 1'-decanediol was used. All copoly(ester-imide)s proved to be non-crystalline materials with glass transition temperatures (T_gs) between 110 and 180 °C and a broad cholesteric melt. Most copoly(ester-imide)s derived from substituted hydroquinones were capable of forming a Grandjean texture upon shearing and of fixing the Grandjean texture upon cooling below T_g. However, 2, 7-dihydroxynaphthalene proved to be unfavourable for the formation of a Grandjean texture.

High Performance Polymers, Vol. 9, No. 2, 121-133 (1997)
DOI: 10.1088/0954-0083/9/2/004


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