Change in Surface Microstructure and Properties of PTFE after Solar Radiation and its Mechanism
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2019年第1期
论文作者：马国政 DING Guangyu LIU Xuebin 王海斗 ZHAI Huanchun ZHU Hui
文章页码：223 - 229
摘 要：A series of solar radiation tests for the polytetrafluoroethylene（PTFE） bulk and film samples were carried out using Q-SUN XE-3-HSC type Solar Radiation Simulator, with the test parameters as follows: radiation intensity is 1 120 W/m2, temperature is 55 ℃ and humidity is 70% RH. Surface morphology, composition and microstructure of the PTFE samples before and after radiation tests were characterized contrastively. Effect of solar radiation on the tribology and wetting properties of PTFE were also studied by tribometer and contact angle tester, respectively. The results show that, for radiated PTFE, surface roughness, the relative content of C element, the friction coefficients and the contact angle with water increased in varying degrees. In conclusion, the obvious change in PTFE samples can be mainly attributed to break of（CFx）-C bonds after bombardment of high energy UV photons, which causes the loss of F-rich groups, oxidation, crosslinking and restructuring of active unsaturated groups.
马国政1,2，DING Guangyu1，LIU Xuebin1，王海斗2，ZHAI Huanchun1，ZHU Hui1
1. China Huayin Ordnance Test Center2. National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering
摘 要：A series of solar radiation tests for the polytetrafluoroethylene（PTFE） bulk and film samples were carried out using Q-SUN XE-3-HSC type Solar Radiation Simulator, with the test parameters as follows: radiation intensity is 1 120 W/m2, temperature is 55 ℃ and humidity is 70% RH. Surface morphology, composition and microstructure of the PTFE samples before and after radiation tests were characterized contrastively. Effect of solar radiation on the tribology and wetting properties of PTFE were also studied by tribometer and contact angle tester, respectively. The results show that, for radiated PTFE, surface roughness, the relative content of C element, the friction coefficients and the contact angle with water increased in varying degrees. In conclusion, the obvious change in PTFE samples can be mainly attributed to break of（CFx）-C bonds after bombardment of high energy UV photons, which causes the loss of F-rich groups, oxidation, crosslinking and restructuring of active unsaturated groups.
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