Side-chain cholesteric liquid crystalline elastomers derived from a mesogenic crosslinking agent: I. Synthesis and mesomorphic properties |
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Authors: | Jian-She Hu Ai-Juan Zhou Li-Qun Yang Bai Wang |
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Institution: | Center for Molecular Science and Engineering, Northeastern University, Shenyang 110004, People’s Republic of China |
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Abstract: | The synthesis of new side-chain cholesteric elastomers derived from a cholesteric monomer and mesogenic crosslinking agent is presented. The chemical structures of the monomers obtained were confirmed by elemental analyses, FT-IR, 1H NMR, and 13C NMR. The mesomorphic properties and thermal stability were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), polarizing optical microscopy (POM), and X-ray diffraction (XRD) measurements. M1 showed cholesteric phase, and M2 displayed enantiotropic nematic phase and monotropic smectic phase. The elastomers containing less than 12 mol% of the crosslinking units revealed reversible mesomorphic phase transition, wide mesophase temperature ranges, and high thermal stability. |
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Keywords: | Liquid crystalline polymers Elastomers Crosslinking Cholesteric phase |
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