Unusual phase behaviour of a new liquid-crystalline side group polymer
Unusual phase behaviour of a new liquid-crystalline side group polymer
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DOI：
10.1080/02678299308027769
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发表时间：
1993
期刊：
影响因子：
2.2
通讯作者：
D. Wolff;H. Cackovic;H. Krüger;J. Rübner;J. Springer
中科院分区：
文献类型：
--
作者：
D. Wolff;H. Cackovic;H. Krüger;J. Rübner;J. Springer
摘要 采用X射线衍射和差示扫描量热法研究了一系列介晶单元中含有偶氮基团的液晶侧基聚甲基丙烯酸酯的相结构。讨论了间隔物和尾部长度对液晶相性质的影响。对于一种聚合物，根据退火温度，发现从亚稳态单层SA相到双层SC相以及到可能是结晶的未识别相的相变。考虑介晶侧基的空间位阻和主链的各向异性构象来讨论这种行为。
Abstract The phase structure of a series of liquid-crystalline side group polymethacrylates with azo-groups in the mesogenic units was investigated by X-ray diffraction and differential scanning calorimetry. The influence of the spacer and tail length on the nature of the liquid crystal phase is discussed. For one polymer, depending on the annealing temperature, a phase transition from a metastable monolayer SA phase to a bilayer SC phase and to an unidentified phase, possibly crystalline, was found. This behaviour is discussed considering steric hindrance of the mesogenic side groups and the anisotropic conformation of the backbone.