高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

侧基横挂偶极单元的液晶聚苯撑乙炔的合成与表征

郑世军1, 黄元灿1, 温刚1, 罗飞1, 李韶峰1, 曹少魁1, 陈思2   

    1. 郑州大学材料科学与工程学院, 郑州 450052;
    2. 北京大学化学与分子工程学院高分子科学与工程系, 北京 100871
  • 收稿日期:2007-10-22 修回日期:1900-01-01 出版日期:2008-05-10 发布日期:2008-05-10
  • 通讯作者: 郑世军

Synthesis and Characterization of Liquid Crystalline Poly(p-phenylene ethynylene)s with Laterally Attached Dipolar Unit

ZHENG Shi-Jun1*, HUANG Yuan-Can1, WEN Gang1, LUO Fei1, LI Shao-Feng1, CAO Shao-Kui1, CHEN Si2   

    1. College of the Material Science and Engineering, Zhengzhou University, Zhengzhou 450052, China;
    2. Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
  • Received:2007-10-22 Revised:1900-01-01 Online:2008-05-10 Published:2008-05-10
  • Contact: ZHENG Shi-Jun

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被引次数

5

摘要： 为了制备电致偏振光发光材料, 以对苯二乙炔和2,5-二溴苯衍生物为单体,通过Sonogashira偶联反应, 采用不同Pd催化剂, 合成了一种侧基横挂偶极基团的液晶聚苯撑乙炔. 单体的化学结构通过IR, NMR和元素分析等方法得到确证. 聚合物外观为黄色粉状固体, 室温下溶于CHCl3和THF等有机溶剂. 将聚合物加热到各自的玻璃化转变温度以上都能形成液晶态并显示双向液晶性. 考察了不同催化剂对合成的聚合物的分子量、聚合物链中单体单元的结构排列以及液晶性质的影响. 结果表明, 两种不同的Pd催化剂对合成的聚合物的分子量以及液晶态温度范围影响不大, 但对聚合物的立构规整性以及聚合物的液晶态织构有较大的影响. Pd(PPh3)4作催化剂合成的聚合物中单体单元的结构排列较单一, 可以观察到清晰的液晶态织构. 以PdCl2(PPh3)2为催化剂合成的聚合物链中单体单元的结构排列相对复杂, 液晶态织构不明显. 变温X 射线衍射研究证实聚合物均为向列相液晶.

关键词: 聚苯撑乙炔, 共轭液晶高分子, 偏振光发光材料

Abstract: Poly(p-phenylene ethynylene)s containing laterally attached dipolar unit were synthesized with Sonogashira coupling reaction using different Pd catalysts in order to develop new organic materials with polarized dichroism. The structures and properties of the intermediate were identified via elementary analysis, IR, NMR etc. The polymers were soluble in common organic solvents and exhibited enantiotropic liquid crystal behavior. It is found that the polymers prepared with different Pd catalysts have similar molecular weights and mesophase temperature. The kind of catalysts has a large effect on the structures of the polymer main chain and polymers textures. The study of thermal WAXD suggests that the polymers formed a Nematic phase.

Key words: Poly(p-phenylene ethynylene), Liquid crystalline conjugated polymer, Materials with polarized light

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