Liquid crystalline polysiloxanes with thioether type spacers and chiral biphenyl mesogens
Liquid crystalline polysiloxanes with thioether type spacers and chiral biphenyl mesogens
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DOI：
10.1002/(sici)1521-3935(19990101)200:1
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发表时间：
1999
影响因子：
2.5
通讯作者：
J. Milano;Jean Michel Robert;J. Vernet;B. Gallot
中科院分区：
文献类型：
--
作者：
J. Milano;Jean Michel Robert;J. Vernet;B. Gallot
在六氯铂酸存在下，聚甲基氢硅氧烷与带有联苯基液晶基元的α-硫代烯烃发生硅氢加成反应，合成了两种以聚硅氧烷为主链、硫醚型间隔基和带有一个或两个手性原子的联苯衍生物为液晶基元的手性液晶聚合物.该聚合物表现出两个中间相作为温度的函数。第一个中间相的性质取决于联苯的手性取代基的性质，但第二个总是SmC * 型，并涵盖了很大的温度范围。
Two chiral liquid-crystalline polymers with polysiloxane main chains, thioether type spacers, and biphenyl derivatives bearing one or two chiral atoms as mesogens were prepared by polyhydrosilylation of polymethylhydrogenosiloxane with α-thioolefins carrying biphenyl-based mesogens in the presence of hexachloroplatinic acid. The polymers exhibit two mesophases as a function of temperature. The nature of the first mesophase depends upon the nature of the chiral substituent of the biphenyl, but the second one is always of the SmC * type and covers a large range of temperature.