含两种不同手性基元侧链液晶聚合物的合成与性能研究  

Synthesis and Characterization of Side Chain Liquid Crystalline Polymers Containing Two Diferrent Chiral Mesogens

作　　者：谢龙伟[1] 普镇才[1] 王基伟[1] 

机构地区：[1]大理学院药化学院,大理671000

出　　处：《科学技术与工程》2013年第26期7731-7735,共5页Science Technology and Engineering

基　　金：云南省教育厅重点项目(2011Z022);大理学院大学生科研基金资助

摘　　要：合成了两种含不同手性基元的液晶单体,6-(4-乙氧基)苯甲酰氧基-6-(4-(4-(4-十一烯酰氧基)苯甲酰氧基)苯基)苯基氧羰基戊酰氧基六氢-[3,2-b]呋喃酯(M1),丙烯酸胆甾醇酯(M2)。将两种单体与含氢聚硅氧烷(PMHS)接枝聚合得到了一系列侧链液晶聚合物。采用红外光谱(FT-IR)、核磁共振(1H-NMR)、差示扫描量热(DSC)、偏光显微镜(POM)、X-射线衍射(XRD)等手段对单体及聚合物的液晶性能进行了表征。结果表明,所有的聚合物都具有很宽的介晶区间。对于以含M1为主的聚合物为近晶相,随着M2在聚合物中含量的增加,破坏了原有聚合物的规整结构,聚合物由近晶相转为胆甾相;同时聚合物的最大选择性反射波长也随之增加,即螺距变大。Chiral side-chain liquid-crystalline polymers were graft copolymerized by using poly （methylhydroge- no） siloxane, two chiral monomers 6-（ 4-ethoxy-benzoyloxy ） -hexahydro-furo [ 3,2-b ] furan-3-y14＇-（ 4-undec-10- enoyloxy-benzoyloxy） -biphenyl-4-yladipate （ M1 ） and cholesteryl acrylate （ M2 ）. The liquid-crystalline properties of the monomers and polymers were investigated by 1H-NMR, FT-IR, DSC, TGA, POM, and XRD measurements. All the chiral liquid crystaUine polymers showed liquid crystalline properties with wide mesophase temperature ranges. For the polymers bearing the majority of M1 , they showed SC ＊ phase. With increase of M2 in the polymers, the regular polymer structures were destroyed, leading to disappearance of smectic arrangement. At the same time, the reflected wavelength of polymers shifted to long wavelength, suggesting that helical pitch （P） became long.

关 键 词：液晶聚合物 手性 相行为 螺距 

分 类 号：O631.1[理学—高分子化学]