Synthesis and Characterization of Sidechain Liquid Cryastalline Polysiloxanes Containting Either Cholesteryl or Cyanobiphenyl Mesogenic Groups

作     者：Xu Guangwei Huang Ronghua Zhang Xianliang 

作者机构：Wuhan University Department of Chemistry Wuhan China (GRID:grid.49470.3e) (ISNI:***) 

出 版 物：《Wuhan University Journal of Natural Sciences》 (武汉大学学报（自然科学英文版）)

年 卷 期：1997年第2卷第1期

页      面：77-83页

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

主　　题：polysiloxane liquid crystal phase behavior mesogenic groups 

摘      要：A series of side chain liquid crystalline polysiloxanes containing either cholesteryl or cyanobiphenyl mesogenic groups were synthesized by the hydrosilylation reaction of a polysiloxane containing Si H group with a vinyl terminated compound containing the mesogenic group. Their chemical structures were confirmed by IR, 1H NMR, and elemental analysis, Their phase behaviors were investigated by differential scanning calorimetry, optical polarizing microscope, and X ray diffraction techniques. The results show that all these polysiloxanes except PⅤ display smectic or nematic mesonorphism or both. The dependence of phase transition temperature on the rigidity of mesogenic unit. the length of spacer group, and the flexibility of  Si(CH 3) 2O  chain is also described.