螺旋状丙烯酸酯类液晶单体的合成及液晶性研究

Study on the synthesis and liquid crystalline properties of spiral acrylate liquid crystal monomers

设计合成了一系列螺旋状丙烯酸酯类液晶树脂化合物，此类不饱和液晶化合物由两个对称的丙烯酸端基和一个联苯棒状介晶基元反应连接形成。采用红外和核磁共振光谱对目标化合物的结构进行了表征，通过示差扫描量热仪（DSC），热台偏光显微镜（POM）和x-射线衍射仪（XRD）对它们的介晶性进行了测定，讨论了酯基氧原子、端基链长和横向取代基的引入对不饱和液晶树脂化合物介晶性的影响。结果表明，合成的化合物均为螺旋状互变热致液晶，横向取代基对该类化合物的液晶性有显著影响。

A series of spiral acrylate liquid crystal resin compound were designed and synthesized. These unsaturated liquid crystalline compounds were formed by the reaction of two symmetrical acrylic terminals and one biphenyl rod-like mesogen. The structures of the target compounds were characterized by IR and NMR spectra. The mesogenic properties of the compounds were determined by differential scanning calorimetry （DSC）, thermal bench polarization microscope （POM） and X-ray diffraction （XRD）. The effects of ester oxygen atoms, terminal chain length and the introduction of lateral substituents on the mesomorphic properties of unsaturated liquid crystalline resin compounds were discussed. The results showed that the synthesized compounds were all spiral interconvert thermotropic liquid crystal and the lateral substituents had a significant effect on the liquid crystallinity of the compounds.