含葡萄糖基元的胆甾型液晶聚合物的合成与表征

把手性单体1-O-(十一烯)-β-D-四乙酰葡萄糖苷(M1)和液晶单体4-烯丙氧基苯甲酸胆甾醇酯(M2)接枝到聚甲基含氢硅氧烷上,手性单体的摩尔分数从0至30%,得到系列液晶聚合物.通过红外光谱(IR)、核磁共振谱(1HNMR)、旋光分析、差示扫描量热法(DSC)、偏光显微分析法(POM)、热失重分析法(TGA)、X射线分析等手段研究了手性单体对侧链胆甾型液晶聚合物性能的影响.结果表明P1~P7都有液晶性且为胆甾型液晶聚合物,系列液晶聚合物的tg和ti随手性单体含量的增加而降低,P1~P7具有较宽的液晶相范围,热稳定性较高,质量损失5%时的热失重温度均在300℃左右.

Synthesis and Properties of Side-Chain Cholesteric Liquid Crystal Polymers Containing Glucose

The chiral monomer 1-O-(hendecene)-β-D-tetraacetyl glucopyranose (M1) and liquid crystal monomer cholesteryl 4-allyloxybenzoate (M2)were grafted onto the backbone of polymethylhydrosiloxane (PMHS). The mesomorphic properties of the series of cholesteric liquid crystalline polymers P1-P7 containing different molecular fractions of M1 from 0 to 30% were investigated by means of FTIR, ¹HNMR spectra, SROT, DSC, POM, TG and X-ray. Experiment results showed that P1-P7 are thermotropic cholesteric liquid crystal polymers and that tg and ti decrease with the increasing content of M1 in the polymers and the mesomorphic temperature ranges of the polymers are broader. The thermal stability of the polymers are about 300°C with only 5wt% lost.