Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2016, Vol. 27 ›› Issue (3): 62 doi: 10.1007/s41365-016-0075-9


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

Rong Li 1  Xin-Zhong He 1,2  Qian-Hong Gao 1,2  Li-Juan Pang 1,2 • Hong-Long Wang1,2 • Jiang-Tao Hu1 • Zhe Xing1 • Guo-Zhong Wu1,3   

  1. 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
  • Contact: Guo-Zhong Wu
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (Nos. 11275252 and 11305243).

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Rong Li, Xin-Zhong He, Qian-Hong Gao, Li-Juan Pang, Hong-Long Wang, Jiang-Tao Hu, Zhe Xing, Guo-Zhong Wu. Variations in surface and electrical properties of polytetrafluoroethylene film after plasma-induced grafting of acrylic acid.Nuclear Science and Techniques, 2016, 27(3): 62     doi: 10.1007/s41365-016-0075-9


Polytetrafluoroethylene (PTFE) film was graft-polymerized 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/cm2) 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 = 0 μg/cm2) to 0.0073 (GD = 218 μg/cm2), 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/cm2) to 110.28 Ω cm2 (GD = 218 μg/cm2) after surface modification, but still retained its inherent high impedance.

Key words: Polytetrafluoroethylene film, Low-temperature plasma, Acrylic acid, Hydrophilicity, Electrical properties