| 含联苯基团热致液晶聚脲的合成与表征 |
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| 引用本文： | 杜竹玮,刘晓华,高彦芳,周其庠,刘德山.含联苯基团热致液晶聚脲的合成与表征[J].清华大学学报(自然科学版),2000,40(2):40-42. |
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| 作者姓名： | 杜竹玮 刘晓华 高彦芳 周其庠 刘德山 |
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| 作者单位： | 清华大学化学工程系,北京,100084 |
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| 摘 要： | 为合成新型热致液晶聚脲，以含液晶基元的联苯二胺（或联邻甲苯胺）、1，6-己二胺、2，4-甲苯二异氰酸酯为原料进行合成。通过改变单体加料顺序发现，仅当先加入己二胺与2，4-甲苯二异氰酸酯预聚，再加入芳香二胺聚合，所得的聚合物才有液晶性。采用这种加料顺序，通过改变芳香，脂肪两种二胺的配比，合成了两个系列的热致液晶聚脲，并确定了合成热致液晶聚脲的最佳配比范围。所得聚合物用偏光显微镜，示差扫描量热分析，广角、小角X射线衍射等方法进行表征，确定了其液晶织构属于向列型。
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| 关 键 词： | 聚脲 液晶 向列型 加料顺序 |
| 文章编号： | 1000-0054(2000)02-0040-03 |
| 修稿时间： | 1999-04-05 |
Synthesis and characterization of thermotropic liquid crystal polyureas containing biphenyl group |
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| DU Zhuwei,LIU Xiaohua,GAO Yanfang,ZHOU Qixiang,LIU Deshan.Synthesis and characterization of thermotropic liquid crystal polyureas containing biphenyl group[J].Journal of Tsinghua University(Science and Technology),2000,40(2):40-42. |
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| Authors: | DU Zhuwei LIU Xiaohua GAO Yanfang ZHOU Qixiang LIU Deshan |
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| Institution: | DU Zhuwei,LIU Xiaohua,GAO
Yanfang,ZHOU Qixiang,LIU Deshan;
(Department of Chemical Engineering,Tsinghua University,Beijing 100084,China) |
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| Abstract: | Two series of thermotropic liquid crystalline polyureas were synthesized by the copolymerization of benzidine (or o tolidine), 1,6 hexane diamine and 2,4 toluene diisocyanate. The resulting copolymers were thermotropic liquid crystals only when the 1,6 hexane diamine mole ratio was in a certain range and only by using aliphatic diamine with 2,4 diicocyanate to prepolymerize followed by the addition of aromatic diamine. The thermotropic liquid crystals were determined to be nematic using a polarizing microscope with a hot stage (POM), a differential scanning calorimeter (DSC), wide angle X ray diffraction (WAXD) and small angle X ray diffraction (SAXD). |
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| Keywords: | polyureas liquid crystal nematic adding order of monomers |
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