Journal of Northeastern University Natural Science ›› 2014, Vol. 35 ›› Issue (12): 1754-1757.DOI: 10.12068/j.issn.1005-3026.2014.12.019

• Materials & Metallurgy • Previous Articles     Next Articles

Synthesis and Characterization of Azobenzene Liquid Crystalline Polymers Containing Cholesteryl Groups

YAO Dan-shu, DUAN Zhi-juan, ZHANG Zhen, MENG Fan-bao   

  1. School of Sciences, Northeastern University, Shenyang 110819, China.
  • Received:2014-01-15 Revised:2014-01-15 Online:2014-12-15 Published:2014-09-12
  • Contact: YAO Dan-shu
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Abstract: The azo monomer 4-(allyloxybenzoyloxy)azobenzene-4′-ethyl formate(M)and chiral monomer 4-(allyloxybenzoyloxy)isopropionate cholesteryl(N)were grafted onto the backbone of polymethylhydrosiloxane. A new kind of azobenzene liquid crystalline polymers(PY1~PY6)containing cholesteryl groups was prepared. Their chemical structures were confirmed by FT-IR and 1HNMR spectra, and mesomorphic properties, phase behavior and thermal stability were investigated by DSC, POM and TG. The results showed that PY1~PY6 are thermotropic cholesteric liquid crystal and display Grandjean texture. With the increasing content of M, tg ascends after a decline, but ti descends slowly. The temperatures when 5% weight loss occurred are higher than 290℃ and the mesomorphic temperature ranges are 162~189℃, which reveal that PY1~PY6 have a high thermal stability and remarkable liquid crystal properties.

Key words: azobenzene, chirality, liquid crystalline polymer, synthesis

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