胆甾相液晶与向列相液晶共聚物的制备及液晶性能的研究

摘要

In this paper , nematic liquid crystal monomer 4-allyloxy-biphenyl-4-ethoxybenzonate (M1)and cholesteric phase liquid crystal monomer 4-(4-allyloxy-phenyl-propionyloxy)hydroxyl biphenyl)cholesteryladipate (M2) were synthesized,mesogenic monomers were grafted to linear polymethyl hydrogensiloxanes, So two kinds of SLCPs with different chemical structures and characters were synthesized.The products were characterized by FT-IR、DSC、TGA、POM and polarimete et al. The results show that,with the increase of M2monomer,the specific rotation of polymer also increases; the clearing point of the liquid crystal and the melt temperature of the polymer increase with the decrease of the content of M2; POM show that P1is a typical nematic liquid crystal;after M2was added in the system, P2-P7were typical cholesteric liquid crystal.%合成了向列相液晶单体4-乙氧基苯甲酸-4’-烯丙氧基联苯酯（M1）和胆甾相液晶分子4-(4-烯丙氧基苯丙酰氧基)-苯基苯氧羰基戊酸胆甾醇酯(M2)，把液晶分子根据不同的浓度配比分别和聚甲基含氢硅氧烷接枝共聚，合成了具有不同化学结构和性能的侧链型液晶聚合物。并利用红外光谱(FT-IR)、热失重分析(TGA)、差示量热扫描分析(DSC)、偏光显微法(POM)和旋光仪等测试手段对其迚行了表征。结果表明：随着单体M2含量的增加，聚合物的比旋光度随之增加；熔融温度和清亮点随 M2含量的增加而降低；偏光照片显示 P1为典型的向列相液晶；M2液晶分子引入后，P2-P7为典型的胆甾型液晶。