制备了一种含薄荷基的手性单体及其对应的液晶聚合物,其化学结构、纯度及旋光性质采用红外光谱（FT-IR）、核磁共振（1H-NMR）及旋光仪进行表征,采用差示扫描量热（DSC）与偏光显微镜（POM）等研究了单体与聚合物的介晶性能和相行为,并用热重分析（TGA）表征了聚合物的热稳定性。结果表明,手性单体呈现胆甾相的油丝织构与焦锥织构,且出现了明显的选择反射现象,主要反射颜色为红色与绿色,且随温度的升高,反射波长发生＂蓝移＂,而聚合物则呈现胆甾相的Grandjean织构。此外,TGA表明液晶聚合物具有良好的热稳定性,热分解温度为335℃。
A chiral liquid crystalline monomer and their corrresponding polymer containing menthyl groups were synthesized.The chemical structures were characterized with FT-IR,1H-NMR,and specific optical rotation was evaluated with a polarimeter.The liquid crystalline properties and phase behavior were investigated by differential scanning calorimetry（DSC） and polarizing optical microscopy（POM）.The thermal stability of the polymer was studied with thermogravimetric analysis（TGA）.The chiral monomer shows the oily streak texture and the focal conic texture of the cholesteric phase,the selective reflection color is mainly red and green,the selective reflection of light shifted to the short wavelength region.The polymer shows cholesteric grandjean texture.In addition,TGA result shows that the obtained polymer has a good stability,and the temperature at which 5 % weight loss occurred（Td） is 335 ℃.
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