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Citation: HE Xiao-Zhi, ZHANG Bao-Yan, TIAN Mei, NIU Hai-Nan. Synthesis and Characterization of Chiral Side-chain Liquid Crystalline Elastomers Containing Isosorbide Group[J]. Chinese Journal of Applied Chemistry, ;2008, 25(10): 1156-1160. shu

Synthesis and Characterization of Chiral Side-chain Liquid Crystalline Elastomers Containing Isosorbide Group

1.
Center for Molecular Science and Engineering, Northeast University, Shenyang 110006

Corresponding author: ZHANG Bao-Yan,
Received Date: 26 September 2007
Available Online: 25 March 2008
Fund Project: 国家自然科学基金(50673015) (50673015)沈阳市科技基金(1071199-1-00) (1071199-1-00)

A series of new chiral liquid crystalline elastomers was prepared by graft polymerization of a nematic monomer,4-allyloxybiphenyl-4'-hexyloxybenzoate,with a chiral crosslinking agent,isosorbide 4-allyloxybenzoyl bisate,using poly(methyl hydrosiloxane) as the backbone.The chemical structures of the monomers and the polymers obtained were confirmed by FTIR,¹H NMR and elemental analysies.The mesomorphic properties were investigated by differential scanning calorimetry,polarizing optical microscopy,and X-ray diffraction.Polymer P₁ and elatomers P₁~P₂ exhibited smectic phase,while elastomers P₄~P₇ showed cholesteric phase,and P₈ displayed no liquid crystal phase.It was found that the glass transition temperatures reduced first and then increased,the isotropization temperatures and the mesophase temperature ranges decreased with increasing the content of the crosslinking unit.The thermal decomposition temperature(at 5% mass loss) of the polymers were greater than 300℃.
- chiral crosslinking agent,
- smectic phase,
- elastomer,
- Grandjean texture
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