主链型液晶聚硅氧烷聚氨酯的合成及性质

合成了主链型联苯类及氧化偶氯苯类液晶聚硅氧烷聚氨酯弹性体，采用红外光谱，示差扫描量热，动态粘弹谱及带热台偏光显微镜等方法对聚合物进行了表征，讨论了它们的结构与性能．研究结果表明，这一系列多嵌段聚氨酯多数是向列型的液晶高分子聚合物，液晶相的形成同嵌段聚氨酯样品的软硬段相互作用有着密切的联系

SYNTHESIS AND PROPERTIES OF MAIN CHAIN LIQUID CRYSTALLINE POLYSILOXANE POLYURETHANE

wo series of mainchain liquid crystalline polysiloxane polyurethane elastomers(that is biphenyl type and azoxybenzene type) were synthesized. The structure and properties of these polymers were characterized by FT-IR, DSC, DMA and polarization microscope. Our study concluded that most of these polyurethane samples exhibited nematic thermotropic liquid crystal character. The liquid crystal properties had strong relations with the interaction between the hard and soft segments of the block polyurethane.