CJCU

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (8): 1240.

• Articles • Previous Articles     Next Articles

Studies on Photochromic Liquid Crystalline Polymers (Ⅲ)─Liquid Crystalline Behavior of Side-Chain Copolysiloxanes Containing Cholesteric Mesogens and Azobenzene Photochromic Groups

ZNANG Qi-Zhen1, WANG Yan2, HOU Jian-An3, XU Mao3   

  1. 1. Department of Chemistry, Shandong University, Jinan, 250100;
    2. Centre of Environmental Science, Shandong University, Jinan, 250100;
    3. Institute of Chemistry, Academia Sinica, Beijing, 100080
  • Received:1993-10-21 Revised:1994-02-23 Online:1994-08-24 Published:1994-08-24

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Abstract: The liquid crystalline properties of side-chain copolysiloxanes containing cholesteric mesogens and azobenzene photochromic groups were characterized by polarized microscopy with a hot stage (POM), DSCand WAXD. On incorporation of nonmesogenic units into LCpolysiloxane the type of mesophase is not changed and smectic texture is preserved for copolysiloxanes PSI-2-8. Composition limit for mesophase existence of copolysiloxanes of mesogenic monomers with monomers, that do not contain mesogenic fragments, is to be 60 mol%. In the composition region of mesophase existence the clearing temperature of copolysiloxanes varies from 130℃ into 170℃ and mesophase thermostability is increased by the increasing nonmesogenic component content of copolysiloxanes.

Key words: Thermotropoc liquid crystalline polymer, Side-chain copolysiloxane, Smectic phase, Cholesteric mesogens

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