交联聚四氟乙烯的拉伸性能及结构研究

Teflon

交联聚四氟乙烯的拉伸性能及结构研究
唐忠锋[1,2,3] 王谋华[1] 赵艳凝[1,3] 吴国忠[1][1]中国科学院上海应用物理研究所,上海201800 [2]广西工学院生物与化学工程系,柳州545006 [3]中国科学院研究生院,北京100049

摘　要:在温度为335℃±5℃氮气气氛条件下,利用电子束辐照制备交联的聚四氟乙烯（XPTFE）。利用拉伸试验机研究XPTFE的拉伸性能,并通过多种技术手段研究其结构变化。结果表明：与PTFE相比,XPTFE的透明度及屈服强度增加,拉伸强度和断裂伸长率降低。随吸收剂量的增加,XPTFE的拉伸强度及屈服强度逐渐增加,断裂伸长率、熔点及结晶焓降低。XPTFE具有交联的网状结构。[著者文摘]

关键词:聚四氟乙烯 辐射交联 交联度 屈服强度
分类号:　TQ325.4[机标]文献标识码：文章编号：栏目信息：科学研究
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Structure and tensile properties of radiation-induced crosslinking of polytetrafluoroethylene sheetsTang Zhongfeng, Wang Mouhua Zhao Yanning, Wu Guozhong1.Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800;2.Department of Biological and Chemical Engineering,Guangxi University of Technology,Liuzhou 545006;3.Graduate University of the Chinese Academy of Sciences,Beijing 100049Abstract:Crosslinked polytetrafluoroethylene（XPTFE） was prepared by electron beam（EB） irradiation at 335℃± 5℃ in a nitrogen gas atmosphere.The structure and tensile properties of XPTFE were analyzed by various methods.It shown that XPTFE sheet had a good transparency and high yield strength compared with PTFE.The elongation at break,melting point and heat of crystallization of XPTFE decreased with absorbed dose,but the yield and tensile strength increased with absorbed dose increased.It was concluded that network was formed with the XTFE by EB irradiation in a nitrogen gas atmosphere in the molten state just above the melting point.[著者文摘]

Key words:polytetrafluoroethylene; radiation crosslinking; crosslinking degree; yield strength