室温显示胆甾相的侧链液晶聚合物的合成与表征  

Synthesis and characterization of side chain liquid crystalline polymers displaying cholesteric phase at room temperature

作　　者：高利 郭璐璐 陈新诗 杨淼 田梅[3] GAO Li;GUO Lu-lu;CHEN Xin-shi;YANG Miao;TIAN Mei(Chemistry Department, Sanquan College of Xinxiang Medical University, Xinxiang 453003, China;Scientific Reaearch Academy of Environmental Protection, Nanning 530000, China;Northeastern University College of Sciences, Shenyang 110004, China)

机构地区：[1]新乡医学院三全学院化学教研室,河南新乡453003 [2]广西壮族自治区环境保护科学研究院,广西南宁530000 [3]东北大学理学院,辽宁沈阳110004

出　　处：《液晶与显示》2020年第6期524-530,共7页Chinese Journal of Liquid Crystals and Displays

基　　金：河南省高等学校重点科研项目(No.20B350007);校级教学改革研究重点项目(No.201508)。

摘　　要：将聚甲基含氢硅氧烷(PMHS)与向列相柔性单体11-(4’-(4-乙氧基苯甲酸)苯)十一烯酸酯(M1)和胆甾相单体烯丙氧基苯甲酸胆甾醇酯(M2)接枝共聚合成了聚合物P1~P7。利用红外光谱(FTIR)、氢谱(1H NMR)、差示扫描量热法(DSC)、偏光分析(POM)、X射线衍射分析(XRD)、热失重分析(TGA)、旋光分析等手段研究了单体和聚合物的结构和液晶性能。结果表明,除聚合物P7为向列型液晶聚合物外,P1~P6为胆甾型液晶聚合物,即向列相柔性单体M1的引入并未改变胆甾相,而且与柔软的硅氧烷主链共同作用起到了降低玻璃化温度(P5、P6在室温即出现液晶态)、拓宽液晶区间、稳定液晶相、降低成本的作用,有利于液晶聚合物的应用。A series of liquid crystal(LC)polymers(P1~P7)were synthesized by grafting with nematic flexible monomer 4-(undec-10-enoyloxy)phenyl 4-ethoxybenzoate(M1)and cholesteric monomer cholesteryl allyloxybenzoate(M2)to polymethyl hydrosiloxane(PMHS).The chemical structures and properties of the monomers and copolymers were investigated by means of fourier transform infrared spectroscopy(FTIR),nuclear magnetic resonance hydrogen spectrometer(1HNMR),differential scanning calorimetry(DSC),polarised optical microscopy(POM),X-ray diffraction(XRD),thermogravimetric analysis(TGA)and polarimeter.The analyses show that P1~P6 are cholesteric LC polymers,except that P7 is a nematic LC polymer.The introduction of nematic flexible monomer M1 did not change the cholesteric phase.The introduction of M1 together with the soft siloxane main chain play a role in reducing the glass transition temperature(P5 and P6 show LC state at room temperature),widening the LC range,stabilizing the LC phase and reducing the cost,which is beneficial to the application of LC polymers.

关 键 词：手性侧链液晶聚合物 胆甾相 接枝共聚 

分 类 号：O753.2[理学—晶体学]