热致性液晶聚氨酯的合成及性能(英文)

Synthesis and properties of thermotropic liquid crystalline polyurethanes

以1,4-双(对羟基烷氧基苯甲酸)苯酯分别与2,4-甲苯二异氰乙酸酯(2,4-TDI)、二苯甲烷-4,4′-二异氰酸酯(MDI)反应制得聚氨酯。运用差热扫描量热分析仪(DSC)、偏光显微镜(POM)对其进行了表征。结果表明,合成的聚氨酯产物在一定温度范围内均为热致性向列型液晶体,其转变温度随着间隔基柔顺性的增加呈下降趋势。

In recent years, there has been increased interest in liquid crystalline polymer consisting of a mesogenic unit and flexible spacer in the main chain. Polyurethanes with flexible spacer in the man chain were reported by limura et al. In this paper, the purpose of the study is to synthesize polyurethane with rod-like segments connected by short Dolymethylene spacer and examine possible liquid crystallinity.