Liquid-crystalline polyimides, 23. Photoreactive, cholesteric copoly(ester-imide)s derived from 1,4-phenylenediacrylic acid and 4-aminobenzoic trimellitimide

✍ Scribed by Hans R. Kricheldorf; Nicolas Probst

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 479 KB
• Volume: 196
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1995.021961106

✦ Synopsis

Abstract

The dichlorides of commercial 1,4‐phenylenediacrylic acid3,3′‐(1,4‐Phenylene)di‐2‐propenoic acid.

and N‐(4‐carboxyphenyl)‐trimellitimide were polycondensed with a chiral spacer prepared from (S)‐3‐bromo‐2‐methylpropanol and 4‐mercaptophenol. Optical microscopy revealed that all the resulting copoly(ester‐imide)s form an enantiotropic cholesteric melt and adopt a Grandjean texture upon slight shearing. The WAXD powder patterns indicate the formation of a layered structure in the solid state. Irradiation with UV light of wavelength ⩽ 360 nm allows crosslinking at any temperature above 25°C.