Variations in surface and electrical properties of polytetrafluoroethylene film after plasma-induced grafting of acrylic acid  

作　　者：Rong Li Xin-Zhong He Qian-Hong Gao Li-Juan Pang Hong-Long Wang Jiang-Tao Hu Zhe Xing Guo-Zhong Wu 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Physical Science and Technology,Shanghai Tech University,Shanghai 200031,China

出　　处：《Nuclear Science and Techniques》2016年第3期88-95,共8页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(Nos.11275252 and 11305243)

摘　　要：Polytetrafluoroethylene(PTFE) film was graftpolymerized with acrylic acid(AAc) via a low-temperature plasma technique.The effect of plasma treatment parameters(radio-frequency power and treatment time) on the spin number of free radicals in PTFE film was examined.Attenuated total reflection Fourier transform infrared(ATR-FTIR)spectroscopy,X-ray photoelectron spectroscopy,scanning electron microscopy,and atomic force microscopy were employed to characterize the chemical structure,surface composition,and microstructure of the original PTFE and PTFE-g-PAAc films,respectively,in order to verify the successful graft polymerization of AAc onto a PTFE film surface.Thermogravimetric analysis illustrated that the thermal stability of bulk PTFE film remains unchanged after graft modification.Water contact angle measurements confirmed that the hydrophilicity of PTFE-g-PAAc film was effectively improved as compared to the original PTFE film.The dielectric constant(ε_r) of PTFE-g-PAAc(GD =218 μg/cm^2) film remained invariable,compared to that of the unmodified PTFE film.Nevertheless,the dielectric loss(tanδ) of PTFE film increased considerably,from 0.0002(GD = 0μg/cm^2) to 0.0073(GD = 218 μg/cm^2),which might be due to the increase in surface polarity and moisture resulting from AAc graft modification.In addition,the surface electrical resistance(R_s) of PTFE film decreased slightly,from 131.89(GD = 0 μg/cm^2) to 110.28 Ω cm^2(GD = 218μg/cm^2) after surface modification,but still retained its inherent high impedance.Polytetrafluoroethylene（PTFE） film was graftpolymerized with acrylic acid（AAc） via a low-temperature plasma technique.The effect of plasma treatment parameters（radio-frequency power and treatment time） on the spin number of free radicals in PTFE film was examined.Attenuated total reflection Fourier transform infrared（ATR-FTIR）spectroscopy,X-ray photoelectron spectroscopy,scanning electron microscopy,and atomic force microscopy were employed to characterize the chemical structure,surface composition,and microstructure of the original PTFE and PTFE-g-PAAc films,respectively,in order to verify the successful graft polymerization of AAc onto a PTFE film surface.Thermogravimetric analysis illustrated that the thermal stability of bulk PTFE film remains unchanged after graft modification.Water contact angle measurements confirmed that the hydrophilicity of PTFE-g-PAAc film was effectively improved as compared to the original PTFE film.The dielectric constant（εr） of PTFE-g-PAAc（GD =218 μg/cm^2） film remained invariable,compared to that of the unmodified PTFE film.Nevertheless,the dielectric loss（tanδ） of PTFE film increased considerably,from 0.0002（GD = 0μg/cm^2） to 0.0073（GD = 218 μg/cm^2）,which might be due to the increase in surface polarity and moisture resulting from AAc graft modification.In addition,the surface electrical resistance（Rs） of PTFE film decreased slightly,from 131.89（GD = 0 μg/cm^2） to 110.28 Ω cm^2（GD = 218μg/cm^2） after surface modification,but still retained its inherent high impedance.

关 键 词：聚四氟乙烯膜 表面组成 接枝聚合 等离子体引发 丙烯酸 导电性能 膨体聚四氟乙烯薄膜 低温等离子体技术 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业] TB383.2[一般工业技术—材料科学与工程]