胆甾液晶／聚合物多组分体系的结构与性能研究（Ⅲ）──ChN／poly（MMA－CO－BMA）混合体系的形态结构

Studies on Structure and Properties of Polymer Dispersed Cholesteric Liquid Crystals(Ⅲ)──The Morphology of Poly(MMA-CO-BMA) and ChN Mixtures

应用Ｘ射线衍射、偏光显微镜及电子显微镜研究了胆甾液晶与甲基丙烯酸甲酯（ＭＭＡ）─甲基丙烯酸丁酯（ＢＭＡ）无规共聚物共混体系的形态结构。研究了体系的结晶态及液晶态的行为和共聚物含量及组成对光学织构的影响。

The morphology of mixtures of poly(MMA-CO-BMA) with different composition and cholesteryl nonanoated(ChN)have been studied by X-ray diffraction,DSC,polarizing microscope and scanning electron microscopy.Three exothermic peaks were presented in the cooling DSC thermogram of mixtures,corresponding to the Ti-ch,Tch-s and Ts-k transitions.The optical microscope investigations of mesophases obtained by cooling the isotropic liquid of mixtures are shown that,the mixtures within a wider range of composition can form both Cholesteric and Smactic A phase.The spherulite structure has been found at the temperature below Ts-k,for the mixtures with ChN content higher than 40%.The effects of the composition and concentration of copolymers on the crystalline and liquid crystalline textures have been discussed in detail.