恶二唑类化合物近晶相中复曲面畴的生长
Growth of toric domains in the smectic phase of oxadiazoles
摘要：
在先前的论文（相变，80（9），987，2007）中，我们讨论了一些具有末端Cl-取代基的介晶恶二唑化合物的近晶和近晶织构。光学显微镜的调查显示了一个非常有趣的行为的近晶相和复晶相;近晶相具有扇形和复曲面纹理和复晶相具有球晶域，其消失的样品被进一步加热，纹理变成一个光滑的。在这里，我们研究了四个具有相同结构但末端具有Br-取代基的恶二唑化合物。近晶相和非晶相的行为与含Cl的化合物中观察到的行为相似。本文的重点是复曲面域的增长，从熔体和域结构中的缺陷的作用。
英文摘要：
In a previous paper (Phase Transitions, 80(9), 987, 2007) we discussed the smectic and nematic textures of some mesomorphic oxadiazole compounds with terminal Cl-substituent. Optical microscope investigations showed a very interesting behaviour of smectic and nematic phases; the smectic phase has fan-shaped and toric textures and the nematic phase has spherulitic domains, which disappear as the sample is further heated, the texture changing into a smooth one. Here, we investigate four oxadiazole compounds with the same structure but terminal Br-substituent. The behaviour of the smectic and nematic phases is like that observed in the compounds with Cl. The focus of the paper is on the growth of toric domains from the nematic melt and on the role of defects in the domain structure.
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