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首页> 外文期刊>Molecular crystals and liquid crystals >On the Nature of Molecular Associations, Static Permittivity and Dielectric Relaxation in a Uniaxial Nematic Liquid Crystal
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On the Nature of Molecular Associations, Static Permittivity and Dielectric Relaxation in a Uniaxial Nematic Liquid Crystal

机译：单轴向列液晶中分子缔合，静电容率和介电弛豫的性质

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摘要

One fluorinated terphenyl compound was studied by polarizing microscopy, x-ray diffraction and dielectric spectroscopy. It exhibits the nematic phase over a range of 107.8°. The average intermolecular distance was observed to be more than in systems without any lateral fluorine substitution. Apparent molecular length was found to be more than the molecular model length, suggesting presence of antiparallel molecular associations. Optimized geometry, obtained by molecular modeling, yielded a dipole moment of 6.68 D. The observed principal dielectric constants are consistent with respective components of dipole moments and show quite a high value of dielectric anisotropy. The threshold voltage and the splay elastic constant have also been determined. Flip-flop mode dielectric relaxation frequency is found to increase with temperature, and the activation energy for the process is found to be 35.53 kJ mot~(-1).
机译：通过偏振显微镜，X射线衍射和介电谱研究了一种氟化三联苯化合物。它在107.8°的范围内显示向列相。观察到平均分子间距离大于没有任何侧向氟取代的系统中。发现表观分子长度大于分子模型长度，表明存在反平行分子缔合。通过分子建模获得的优化几何结构产生了6.68 D的偶极矩。观察到的主要介电常数与偶极矩的各个分量一致，并且显示出很高的介电常数值。还已经确定了阈值电压和张开弹性常数。发现触发器模式介电弛豫频率随温度而增加，并且该过程的活化能为35.53 kJ mot〜（-1）。

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