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Preparation and Properties of Cholesteric Network Polymers Based on Liquid Crystalline Epoxides

✍ Scribed by Andreas Hartwig; Tapan Kumar Mahato; Torsten Kaese; Dieter Wöhrle

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
212 KB
Volume
206
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Summary: Polyether network polymers with cholesteric superstructure are formed by the photochemically induced cationic copolymerisation of a nematic diepoxide with chiral epoxides. If a cholesteric superstructure is formed or not, depends on the temperature at which the photopolymerisation is carried out. The storage modulus is higher above T~G~ in samples with cholesteric superstructure. Optical rotations and vibrational circular dichroism spectra (VCD) depend strongly on the surface state of the substrates. From the VCD spectra it is concluded that the copolymerisation leads to different superstructures depending on the rub directions of the substrates.

IR absorption spectrum and VCD spectrum of the cholesterol derivative 4.

magnified imageIR absorption spectrum and VCD spectrum of the cholesterol derivative 4.

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