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垂直排列液晶盒中反铁电液晶TFMHxPOCBC-D2偏振红外光谱研究

物理学报, 2001, 50(2): 227-232.
DOI: 10.7498/aps.50.227
CSTR: 32037.14.aps.50.227

STUDY OF POLARIZED FT-IR FOR ANTIFERROELECTRIC LIQUID CRYSTAL TFMHxPOCBC-D2 IN A HOMEOTROPICALLY ALIGNED CELL

Acta Phys. Sin., 2001, 50(2): 227-232.
DOI: 10.7498/aps.50.227
CSTR: 32037.14.aps.50.227
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  • 摘要

    本文通过偏振红外吸收光谱研究了铁电与反铁电液晶分子TFMHxPOCBC-D2(4-(trifluoromethylhexy-3-d2 carbonyl)phenyl 4′-octyloxybiphenyl caboxylate)在垂直排列取向液晶盒中CD2基团绕手征性烷基链转动的受阻行为.实验结果显示CD2的偏振红外吸收在Sm-C相不同于Sm-CA相.建立了一个CD2转动受阻模型,在这一模型的基础上,对CD2的偏振红外吸收进行了模拟计算,较好地解释了CD2红外吸收在铁电和反铁电液晶相下的行为差异,得到了CD2基团绕手征性烷基链转动受阻的结论.

     

    Abstract

    We have investigated the polarization dependence of FT-IR of the stretching of CD2 in chiral alkyl chain of TFMHxPOCBC-D2(4-(trifluoromethylhexy-3-d2 carbonyl) phenyl 4′-octyloxybiphenyl caboxylate) with a homeotropically aligned cell.It is found that the polarization dependence of Sm-C and that of Sm-CA are different.Simulation calculation indicates that the rotation of CD2 around the alkyl chain is hindered.

     

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