A new series of ferroelectric liquid crystals and side chain liquid crystalline polymers based on halogen-containing chiral centres has been synthesized. Chemical structures were analysed by NMR. Liquid crystal phases were characterized by differential scanning calorimetry, optical polarizing microscopy, and X-ray diffractometry. The behaviour of the liquid crystalline phases was investigated as a function of spacer units and differing terminal asymmetric moieties. It was found that phase transition temperatures decreased with increasing length of the oligooxyethylene spacer unit. Differing terminal asymmetric moieties led to differing mesophase phenomena. Furthermore, a wide temperature range (including room temperature) of a chiral smectic C phase was achieved.
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Document Type: Research Article
Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan 300, ROC
Institute of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 300, ROC
Department of Chemical Engineering, National Chung Hsing University, Taichung, Taiwan 402, ROC
Publication date: 01 March 2001
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