Broad liquid crystalline temperature range of ferroelectric liquid crystals |
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Authors: | Jr-Hong Chen Ging-Ho Hsiue Cheng-Pei Hwang Jung-Lung Wu |
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Institution: |
a Department of Chemical Engineering, National Tsing Hua University, Taiwan, Republic of China |
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Abstract: | Novel ferroelectric liquid crystalline compounds, containing the (S)-2-methyl-l -butyl (4-hydroxybiphenyl-4'-carbonyloxy)biphenyl-4-carboxylate mesogenic group and an oligooxyethylene spacer, were synthesized. The mesomorphic properties of these materials were investigated by differential scanning calorimetry (DSC), optical polarizing microscopy (POM) and powder X-ray diffraction measurement. The results indicate that all members of this series exhibit a very broad temperature mesophase range (reaching a maximum around 210°C) including a blue phase (BP), cholesteric (Ch), twist grain boundary A (TGBA), chiral smectic C (S*c), and smectic X (Sx) phases. The mesomorphic properties are discussed and a comparison is made with three phenyl rings of ester core analogues. |
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