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Thermotropic liquid-crystalline aromatic-aliphatic polyimides, 4. Poly(imide-urethane-carbonate)s based on pyromellitdiimide and 3,4:3′,4′-biphenyldicarboximide

✍ Scribed by Tomohiro Hirata; Moriyuki Sato; Ken-ichi Mukaida

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
635 KB
Volume
195
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Main‐chain types of thermotropic liquid‐crystalline (LC) poly(imide‐urethane‐carbonate)s were synthesized by melt polycondensation of N,N′‐bis(6‐hydroxyhexyl)pyromellitdiimide or N,N′‐bis(6‐hydroxyhexyl)‐3,4:3′,4′‐biphenyldicarboximide with diphenyl hexamethylenedicarbamate and/or diphenyl hexamethylenedicarbonate. The poly(imide‐urethane)s were also obtained from the dihydroxyalkylene diimide derivatives and hexamethylene diisocyanate by polyaddition. Yields and molecular weights of the resulting polymers tended to decrease with increasing urethane units. Differential scanning calorimetry (DSC) measurements, polarizing microscopic observations and powder X‐ray analyses at various temperatures demonstrated that the carbonaterich copolymers comprising the 3,4:3′,4′‐biphenyldicarboximide derivative formed a nematic mesophase. Temperature‐dependent Fourier‐Transform infrared measurements suggest that hydrogen bonding of urethane linkages affects the formation of LC mesophases.

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