含氟席夫碱型环氧液晶聚合物的合成与表征

发布时间：2018-03-02 08:47

  本文关键词： 含氟液晶 席夫碱 环氧 聚硅氧烷　出处：《高分子材料科学与工程》2017年06期 　论文类型：期刊论文

【摘要】：合成了席夫碱型含氟液晶单体(4-烯丙氧基苯甲酸)-2-甲氧基-4-三氟甲氧基苯胺亚甲基-苯酯(M)和环氧液晶单体(4-烯丙氧基苯甲酸)-4-(2,3-环氧丙氧基)-苯酯(E),将它们接枝共聚到含氢聚硅氧烷上,得到系列含氟席夫碱型环氧液晶聚合物PI~PVI。采用红外光谱、核磁共振、差示扫描量热、热重分析、偏光显微镜和X射线衍射等手段对单体及聚合物的结构和液晶性能进行表征。结果表明,聚合物PI~PVI呈现向列相。从PI到PVI随着单体M含量的减少,聚合物玻璃化转变温度(T_g)和清亮点(T_i)均呈下降趋势。该系列聚合物热稳定性良好,液晶区间在36.4~177.5℃之间。
[Abstract]:Schiff base liquid crystal monomers containing fluorine (4-allyloxy benzoic acid) -2-methoxy -4- trifluoromethoxyaniline methylene phenyl ester (M) and epoxy liquid crystal monomer (4-allyloxy benzoic acid) were synthesized and grafted with Ester. Copolymerized onto hydrogen-containing polysiloxane, A series of fluorine-containing Schiff base epoxy liquid crystalline polymers (PI- PVI) were obtained by IR, NMR, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The structure and liquid crystal properties of monomers and polymers were characterized by polarizing microscope and X-ray diffraction. The results showed that the polymer PI~PVI presented nematic phase, and from Pi to PVI decreased with the decrease of monomer M content. The glass transition temperature (T _ g) and the T _ (I)) of the polymer show a downward trend. The series of polymers have good thermal stability and the liquid crystal range is between 36.4 鈩，

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