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Frustrated smectic liquid crystalline phases in lactic acid derivatives

机译：乳酸衍生物中沮丧的近晶液晶相

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摘要

We have prepared and studied a series of compounds with different types of molecular core and lactate unit in the chiral terminal chain. We draw a survey and comparison of their mesomorphic properties with respect to the occurrence of twist grain boundary (TGB) phases. The materials exhibit extremely wide TGBA phase more than 60K broad, unique TGBA-TGBC-SmC*-SmCA* phase sequence and unique re-entrant TGBA phase below the SmA phase. TGB phases have been induced in binary mixtures of molecules with different molecular shape and chirality (chiral lactic acid derivative and non-chiral hockey-stick mesogen). Unique effect is observed for compounds with TGBA phase, where the applied electric field transforms the planar texture into the homeotropic one, homogeneously dark in crossed polarizers. The process is analogy of the Frederiks transition so far known only for nematics. This effect, changing the bright state to the dark one, is promising for applications.
机译：我们已经制备并研究了一系列在手性末端链中具有不同类型的分子核心和乳酸单元的化合物。我们对扭曲晶界（TGB）相的出现进行了调查，并比较了它们的同质性。这些材料展现出超过60K宽的极宽TGBA相，独特的TGBA-TGBC-SmC * -SmCA *相序列以及在SmA相以下的独特的折返TGBA相。已在具有不同分子形状和手性的分子的二元混合物（手性乳酸衍生物和非手性曲棍球型液晶元）的二元混合物中诱导了TGB相。对于具有TGBA相的化合物，观察到了独特的效果，其中所施加的电场将平面纹理转换为同质的，在正交偏振器中均匀变黑。该过程类似于迄今为止仅以向列相知的腓特烈过渡。将亮状态更改为暗状态的这种效果对于应用很有希望。

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