主链型液晶聚氨酯的合成及性能研究

以4，4′–二羟基联苯与6–氯–1–己醇为原料，合成一种具有液晶性的中间体4，4′–双(6–羟己氧基)联苯(BHHBP)，再分别与1，6–己二异氰酸酯、甲苯–2，4–二异氰酸酯、异氟尔酮二异氰酸酯、4，4′–二苯基甲烷二异氰酸酯、苯二甲基二异氰酸酯反应合成了五种结构不同的主链型液晶聚氨酯(PUR)。用核磁共振波谱仪、傅立叶变换红外光谱仪、热重分析仪、差示扫描量热分析仪、偏光显微镜和X射线衍射仪等表征了中间体BHHBP以及所合成的PUR的结构与性能，并详细探讨了PUR的结构对材料热性能和液晶性能的影响。

Synthesis and Properties of Main-Chain Liquid Crystal Polyurethanes

The liquid crystal intermediate (BHHBP) was prepared by 4,4′-dihydroxydiphenyl and 6-chloro-1-hexanol. Five types of main-chain liquid crystalline polyurethanes with different chemical structures were synthesized by the obtained BHHBP, reacting with 1,6-diisocyanate hexane,2,4-toluene diisocyanate,isophorone diisocyanate,4,4′-diphenyl methane diisocyanate and xylene diisocyanate,respectively. The chemical structures and properties of BHHBP and the polyurethanes were characterized by nuclear magnetic resonance spectrometer,Fourier transform infrared spectroscopy,differential scanning calorimetry,polarized optical microscopy and X-ray diffraction. Furthermore,the influence of the structure of polyurethanes on thermal properties and liquid crystal behaviors was discussed in detail.