含氟聚醚醚酮改性环氧树脂形状记忆性质的动态热力学机理研究  

Thermodynamic Property of Shape Memory Epoxy Resin Modified with 6F-PEEK

作　　者：高军鹏[1] 何先成[1] 安学锋[1] 张晨乾[1] 益小苏[1] 党国栋[2] 陈春海[2] 

机构地区：[1]北京航空材料研究院先进复合材料重点实验室,北京100095 [2]吉林大学麦克德尔米德实验室,长春130012

出　　处：《航空材料学报》2011年第4期69-73,共5页Journal of Aeronautical Materials

基　　金：国家973计划项目(2010CB631101)

摘　　要：使用动态力学分析仪(DMA)、扫描电子显微镜(SEM)对具有形状记忆的含氟聚醚醚酮(6F-PEEK)改性环氧树脂的动态热力学行为和组分之间的相分离形貌进行了研究。动态力学-温度谱图表明,在130℃和223℃存在两个内耗峰,分别对应6F-PEEK和环氧树脂的玻璃化转变温度。具有较低玻璃化转变温度的6F-PEEK充当可逆相,具有较高玻璃化转变温度的环氧树脂充当固定相。材料在变形时,6F-PEEK的能量变化主要是熵的变化,而环氧树脂主要是内聚能的变化。熵值增大和内聚能的释放是材料完成形状记忆过程的驱动力。随6F-PEEK含量的增加,动态力学-温度谱图上的内耗峰的强度增加,表明在变形温度下有更多的6F-PEEK分子链段发生运动,材料的弯曲变形幅度增大。The dynamic mechanics and phase separation behavior of epoxy with shape memory modified by fluorinated poly（ether ether ketone） terminated with —OH（6F-PEEK） was characterized by DMA and SEM respectively.DMA result shows that there are two glass transition temperatures in this material.The cured epoxy phase showing high Tg of 223℃ acts as hard-segment-forming phase and is responsible for the permanent shape.6F-PEEK is used as switching phase for a thermally induced shape-memory effect.At the transition temperature of 150℃,the chains of 6F-PEEK are moved,while the chains of cured epoxy are frozen,resulted in the shape memory effect of the blends.The bending angle of the resin was increased with increasing the content of 6F-PEEK.

关 键 词：热力学 链段运动 变形温度 形状记忆 

分 类 号：TB332[一般工业技术—材料科学与工程]