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3. Mesomorphic properties of side-chain cholesteric liquid-crystalline elastomers

Author

Shi-Chao Ren, Baoyan Zhang, Mei Tian, Jianshe Hu, and Deng-Yuan Guo

Subjects
Thermogravimetric analysis, Materials science, Polymers and Plastics, Mesophase, Elastomer, Crystallography, Colloid and Surface Chemistry, Differential scanning calorimetry, Liquid crystal, Phase (matter), Polymer chemistry, Materials Chemistry, Side chain, Thermal stability, Physical and Theoretical Chemistry
Abstract

New monomer cholesteryl 4-(10-undecylen-1-yloxybenzoyloxy)-4′-ethoxybenzoate (M1), crosslinking agent biphenyl 4,4′-bis(10-undecylen-1-yloxybenzoyloxy-p-ethoxybenzoate) (M2) and a series of side-chain cholesteric elastomers were prepared. The chemical structures of the monomers and elastomers obtained were confirmed by element analyses, FT-IR, and 1H NMR. The mesomorphic properties and thermal stability were investigated by differential scanning calorimetry, thermogravimetric analysis, polarizing optical microscopy, and X-ray diffraction measurements. The influence of the content of the crosslinking unit on the phase behavior of the elastomers was examined. M 1 showed cholesteric phase, and M 2 displayed nematic 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.

Published
2005

4. Mesomorphic properties of side-chain cholesteric liquid-crystalline elastomers.

Author

Jian-She Hu, Bao-Yan Zhang, Mei Tian, Shi-Chao Ren, and Deng-Yuan Guo

Abstract

New monomer cholesteryl 4-(10-undecylen-1-yloxybenzoyloxy)-4′-ethoxybenzoate (M1), crosslinking agent biphenyl 4,4′-bis(10-undecylen-1-yloxybenzoyloxy-p-ethoxybenzoate) (M2) and a series of side-chain cholesteric elastomers were prepared. The chemical structures of the monomers and elastomers obtained were confirmed by element analyses, FT-IR, and 1H NMR. The mesomorphic properties and thermal stability were investigated by differential scanning calorimetry, thermogravimetric analysis, polarizing optical microscopy, and X-ray diffraction measurements. The influence of the content of the crosslinking unit on the phase behavior of the elastomers was examined. M1 showed cholesteric phase, and M2 displayed nematic 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. [ABSTRACT FROM AUTHOR]

Published
2005

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