SYNTHESIS, STRUCTURE AND PROPERTIES OF COPOLYMER OF CHOLESTERIC ESTER Ⅳ. THE PHASE TRANSITION AND OPTICAL PROPERTIES OF PMACE

Chinese Journal of Applied Chemistry ›› 1988, Vol. 0 ›› Issue (6): 57-60.

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SYNTHESIS, STRUCTURE AND PROPERTIES OF COPOLYMER OF CHOLESTERIC ESTER Ⅳ. THE PHASE TRANSITION AND OPTICAL PROPERTIES OF PMACE

Zhou Enle, Zhao Xiaoguang, Zhang Yongqing

Changchun Institute of Applied Chemistry, Academia Sinica

Received:1987-11-23 Revised:1988-05-31 Published:1988-12-10 Online:1988-12-10

Abstract

Abstract: The phase transition and optical properties of copolyfilets of cholesteric ester of hydroxyethyl methylmethacrylate(PMACE) were studied by DSC, optical microscopy,scanning electron microscopy and X-ray diffraction. An isotropic-mesophase transition and a mesophase-crystal transition were tound in the cooling DSC curve of PMACE. The temperature of transitions increases with dicrease of the content of cholesteric side chain units. Under certain conditions PMACE was found to be turned into liquid crystalline state as observed by crossed polarizers of polarizing microscope and SEM. Solution of PMACE in CHCl₃ is optical anisotropic. Its specific rotation value depends on the ratio of methylmethacrylate to cholesteryl group.

Key words: Cholesteric ester, Liquid crystal of polymer, Phase transition, Optical property

Zhou Enle, Zhao Xiaoguang, Zhang Yongqing. SYNTHESIS, STRUCTURE AND PROPERTIES OF COPOLYMER OF CHOLESTERIC ESTER Ⅳ. THE PHASE TRANSITION AND OPTICAL PROPERTIES OF PMACE[J]. Chinese Journal of Applied Chemistry, 1988, 0(6): 57-60.

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SYNTHESIS, STRUCTURE AND PROPERTIES OF COPOLYMER OF CHOLESTERIC ESTER Ⅳ. THE PHASE TRANSITION AND OPTICAL PROPERTIES OF PMACE

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