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

Preparation and Research of Liquid Crystal Performance of Cholesteric Phase Liquid Crystal and Nematic Phase Liquid Copolymer

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。

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.