联苯型液晶聚氨酯/环氧体系的动态力学性能  

Dynamic mechanical properties of diphenylnate liquid crystalline polyurethane/epoxy resin blends

作　　者：班建峰[1,2] 陆绍荣[2] 于春贺[2] 覃利琴[1] 

机构地区：[1]玉林师范学院化学与材料学院,广西玉林537000 [2]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：《热固性树脂》2011年第4期11-14,共4页Thermosetting Resin

基　　金：广西自然科学基金项目(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：采用动态热力学分析方法(DMA),研究了联苯液晶聚氨酯(DLCP)/环氧树脂(E-51)固化体系的储能模量、损耗模量和力学损耗因子随温度的变化情况。在玻璃化转变温度(Tg)下,通过改变振动频率求出链段运动的活化能并探讨聚合物分子链段的运动情况。结果表明:DLCP可降低材料的内耗,提高材料的Tg。加入质量分数5%的DLCP,复合材料的储能模量可达2 700 MPa,Tg比纯树脂提高10～30℃。The changes of storage modulus, loss modulus and the mechanical loss factor（ tan δ） with temperature of diphenylnate liquid crystalline polyurethane （DLCP）/epoxy resin （E -51 ） blends were studied by dynamic mechanical analysis （DMA）. At the glass transition temperature （ Ts） , the activation energy of chain was obtained by changing the oscillation frequency. The movement of molecular chains was investigated. The results showed that the internal friction of blends was reduced and the Tg was increased by adding DLCP. The storage modulus of the composites with 5% DLCP（ based on E -51 ）was up to 2 700 MPa and the Ts was higher than that of pure E -51 by 10-30 ℃.

关 键 词：液晶聚氨酯 环氧树脂 动态力学性能 储能模量 损耗模量 力学损耗因子 玻璃化转变温度 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]