主链柔顺性对侧链液晶聚合物液晶性能的影响  

EFFECT OF FLEXIBILITY OF THE MAIN CHAIN ON PROPERTIES OF SIDE CHAIN LIQUID CRYSTAL POLYMERS

作　　者：由英才[1] 王彦利[1] 张保龙[1] 杜宗杰[1] 

机构地区：[1]南开大学化学系,天津300071

出　　处：《高分子材料科学与工程》2000年第4期155-157,161,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目

摘　　要：由对羟基苯甲酸与对羟基苯甲醚反应得到了 4-甲氧基 - 4′-羟基苯甲酸苯酯 (MPHB) ,MPHB再分别与环氧氯丙烷和甲基丙烯酰氯反应生成 4-甲氧基 - 4′- (2 ,3-环氧丙基氧 )苯甲酸苯酯 (MPEB)和 4-甲氧基 - 4′-甲基丙烯酰氧苯甲酸苯酯 (MPMAB)。用阳离子和自由基聚合法聚合得到了具有相同液晶基元而主链结构和间隔基不同的聚合物 PMPEB和 PMPMAB。用 DSC、热台偏光显微镜和 X射线衍射仪对合成的聚合物进行了表征。结果表明 ,主链柔顺性大的 PMPEB具有液晶性 ,而主链刚性较大的 PMPMAB不具液晶性。The 4 methoxyphenyl 4′ hydroxybenzoate(MPHB) was prepared by esterification of hydroquinone monomethyl ether with p hydroxybenzoic acid in the presence of sulfunic acid and boric acid, then the reaction of MPHB with methacryloyl chloride and epihydrodrine obtained 4 methoxyphenyl 4′ (2,3 epoxypropoxy) benzoate(MPEB) and 4 methoxyphenyl 4′ methacryloylbenzoate(MPMAB) respectly. The MPEB was polymerized in presence of an ethereal solution of boron trifluoride etherate in methylene dichloride at 20 ℃ for 24 h and the MPMAB was polymerized in presence of AIBN in THF at 60 ℃ for 7 h. The properties of synthisized polymers were characterized by DSC, X ray diffraction and polarization microscope equipped thermostated stage. Results show the PMPEB containing relatively flexible main chain give liquid crystal properties; the PMPMAB containing relatively rigid main chain does not show liquid crystal.

关 键 词：液晶高聚物 液晶性能 结构 主链柔顺性 

分 类 号：O631.1[理学—高分子化学] TN104.3[理学—化学]