含酒石酸基元的液晶单体及其聚合物的合成与表征

Synthesis and Properties of Liquid Crystalline Monomers and Polymers Containing Tartaric Acid Derivative

合成了一种以酒石酸为中心的新型工字型液晶单体2,3-二乙酰氧基-1,4-丁二酸对烯丙氧基苯甲酸对苯二酚酯(M1),将其与手性液晶单体4-烯丙氧基苯甲酸胆甾醇酯(M2)共聚,得到侧链液晶聚合物P1～P8。通过红外光谱(FT-IR)、核磁共振(1H-NMR)、偏光显微镜(POM)、差示扫描量热分析(DSC)和X射线衍射(XRD)等手段对所获单体及聚合物的结构和液晶相行为进行了表征。结果表明,液晶单体M1具有近晶相扇形、纹影织构,手性单体M2具有胆甾相油丝织构。聚合物P1～P8出现胆甾相的Grandjean织构,随着单体M1含量的增加,聚合物P1～P8的Tg呈上升趋势,液晶区间变窄。

A new kind of H-shaped liquid crystal based on tartaric acid was synthesized,which was 2,3-diacetoxysuccinic acid bis（4-（allyloxy）benzoyloxy） hydroquinone ester （M1）. Using cholesteryl allyloxybenzoate （M2） as a chiral monomer,poly （methyl hydrosiloxane） as the backbone,a series of new liquid crystalline polymers P1～P8 was prepared by graft polymerization with M1. The chemical structures of the monomers and the polymers obtained were confirmed by infrared spectrum （IR） and 1H nuclear magnetic resonance spectrum（1H-NMR）. Their mesomorphic properties and phase behavior were investigated by differential scanning calorimetry （DSC）、polarizing optical microscopy （POM） and X-ray diffraction （XRD）. The results show that M1 displays fan shaped texture and schlieren texture of the smectic phase,M2 exhibits typical oily streak texture of the cholesteric phase. Polymers P1～P8 reveal grandjean texture of the cholesteric phase. With increasing the content of M1,the glass transition temperatures enhance and the mesophase ranges decrease in the polymers.