拉伸倍数对ePTFE结构和性能的影响  

Effect of drawing ratio on structure and property of expanded polytetrafluoroethylene(ePTFE)

作　　者：涂永辉 余若冰[1] 杨雪[2] 焦正[3] TU Yonghui;YU Ruobing;YANG Xue;JIAO Zheng(School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China;Institute of Noise and Vibration, Naval University of Engineering, Wuhan 430033, China;School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, Chin)

机构地区：[1]华东理工大学材料科学与工程学院,上海200237 [2]海军工程大学振动与噪声研究所,武汉430033 [3]上海大学环境与化学工程学院,上海200444

出　　处：《上海大学学报（自然科学版）》2017年第6期851-858,共8页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(51003209)

摘　　要：对聚四氟乙烯(polytetrafluoroethylene,PTFE)进行拉伸,可以得到膨体聚四氟乙烯(expanded polytetrafluoroethylene,e PTFE).探讨拉伸倍数对e PTFE结构和性能的影响.结果表明:随着拉伸倍数的增大,簇状的晶体减少,纤维逐渐增多,微孔增多;随着拉伸倍数的增大,e PT泊松比逐渐减小,当拉伸倍数为10时,e PTFE的泊松比为-1.57,在非等温结晶过程中,e PTFE的结晶焓变减小,半结晶时间增大.Expanded polytetrafluoroethylene （ePTFE） can be obtained from polytetrafluoroethylene （PTFE） by drawing. Effect of the drawing ratio on the structure and properties of ePTFE was investigated. The following results were obtained. 1） With the increase of drawing ratio, the amount of tuft-like crystals was small, fibers increased and cavities rose in ePTFE. 2） When the drawing ratio was 10, the Poisson＇s ratio was -1.57. As the drawing ratio increased, the Poisson＇s ratio gradually depressed. 3） In anon-thermal crystallization process, as increasing drawing ratio, enthalpy of ePTFE decreased and semi-crystallization time became longer.

关 键 词：膨体聚四氟乙烯(expanded polytetrafluoroethylene ePTFE) 拉伸 泊松比 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业]