一种液晶聚氨酯的合成及应用  

Synthesis and Application of A Liquid Crystalline Polyurethanes

作　　者：班建峰[1] 陆绍荣[1] 于春贺[1] 黄志义[1] 刘括[1] 

机构地区：[1]桂林理工大学有色金属及材料加工新技术教育部重点实验室,广西桂林541004

出　　处：《高分子材料科学与工程》2011年第11期9-12,共4页Polymer Materials Science & Engineering

基　　金：广西自然科学基金资助项目(0991003Z;0842003-4A);广西科技攻关项目(0992022-4);广西高校优秀人才资助计划(08817)

摘　　要：以对苯二酚、对羟基苯甲酸、甲苯二异氰酸酯（2,4-TDI）和二缩三乙二醇等为原料,采用溶液聚合的方法,共缩聚合成具有液晶性的主链型聚氨酯（PLCP）,并采用傅里叶红外光谱（FT-IR）、偏光显微镜（POM）及广角X射线衍射（WAXD）等对其结构进行了表征,研究证实该化合物为向列型液晶。研究了PLCP增韧改性环氧树脂固化体系的力学性能、热性能及断裂面的微观形态结构,结果表明,PLCP质量分数为3%可使材料的冲击强度提高近2倍,热分解温度提高5℃~10℃。The main-chain liquid-crystalline polyurethane（PLCP） was synthesized by the solvent copolymerization of hydroquinone,para hydroxy benzoic acid,toluenediisocyanate（TDI） and trithylene glycol,then the liquid crystalline properties was characterized by means of Fourier transformed infrared spectroscopy（FT-IR）,polarized optical microscope（POM）,and wide-angle X-ray diffraction（WAXD）.It shows that this compound is nematic liquicl crystal texture.The mechanical properties,thermal properties and microscopic fracture surface morphology of the PLCP toughened epoxy resin were investigated.Experimental results show that the impact strength of composites is two times higher than that of the unmodified system when the content of PLCP loading reaches 3%.In addition,the thermal decomposition temperature is also 5 ℃～10 ℃ higher than that of the unmodified system.

关 键 词：液晶聚氨酯 环氧树脂 冲击强度 增韧 

分 类 号：O631.1[理学—高分子化学]