THE POLYMORPHISM OF SOME LIQUID-CRYSTALLINE 4'-N-ALKYLOXY-3'-NITRO-BIPHENYLCARBOXYLIC ACIDS
THE POLYMORPHISM OF SOME LIQUID-CRYSTALLINE 4'-N-ALKYLOXY-3'-NITRO-BIPHENYLCARBOXYLIC ACIDS
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DOI：
10.1002/crat.19800150315
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发表时间：
1980-01-01
期刊：
影响因子：
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通讯作者：
WIEGELEBEN, A
中科院分区：
文献类型：
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作者：
DEMUS, D;MARZOTKO, D;WIEGELEBEN, A
用量热法和显微镜研究了n = 6，12，14，15，16，18的同系列物质。在n = 16和n = 18的同系物中，出现立方结构的近晶D型相。这些相变的动力学，其中近晶D是参与显示出强烈的依赖于实验条件。在过冷状态下，我们首次发现了近晶相，它相对于另一种液晶相（SD）是亚稳的。
The substances of the homologous series withn= 6, 12, 14, 15, 16, 18 were investigated by calorimetry and microscopy. In the lower members exist nematic, smectic A and smectic C phases, in the homologs withn= 16 and 18 appear phases of the type smectic D with cubic structure. The kinetics of these phase transitions, in which smectic D is participating shows a strong dependence upon the experimental conditions. Supercooling, as well as, overheating effects were found. In the supercooled state we could detect for the first time smectic phases, which are metastable with respect to another liquid crystalline phase (SD).