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以含液晶基元的单体 2 ,5-二 (对异烷氧基苯甲酰氧基 ) -对苯二酚和不同结构的脂族二酰氯 ,采用低温溶液缩聚的方法 ,合成了一系列新的液晶基元垂直于分子主链的 SC相串型液晶高分子。单体的结构通过元素分析、IR、1H-NMR和 MS等方法确证。聚合物通过 GPC、DSC、TG、WAXD和偏光显微镜等方法测试表征。研究发现 ,所有的聚合物加热至各自的熔点以上都能形成液晶态 ,在液晶态可以观察到破焦锥织构 ,通过变温 X射线衍射证明它们为 SC相。所有聚合物的熔点和液晶态的清亮点随分子中末端烷氧基增大和柔性间隔段长度增加逐渐降低 ,液晶态温度范围变窄。
A series of monomers, 2, 5-di (p-iso-alkyloxybenzoyloxy) -hydroquinone and aliphatic diacid chlorides with different structures, were synthesized by condensation polymerization using low temperature solution The new liquid crystal cell is perpendicular to the SC main chain liquid crystal polymer. The structure of the monomer was confirmed by elemental analysis, IR, 1H-NMR and MS methods. The polymer was characterized by GPC, DSC, TG, WAXD and polarized light microscopy. The study found that all polymers heated to their melting point above the liquid crystal state can be formed in the liquid crystal state can be observed broken cone pyramidal structure, by temperature-ray X-ray diffraction proved that they are SC phase. The melting point of all the polymers and the clearing point of the liquid crystal state decrease gradually with the increase of the terminal alkoxy groups in the molecule and the increase of the length of the flexible spacer, and the temperature range of the liquid crystal becomes narrower.