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Molecular-Level Reinforced Adhesion Between Rubber and PTFE Film Treated by Atmospheric Plasma Polymerization

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Abstract

Extremely strong reinforced adhesion between a polytetrafluoroethylene (PTFE) film and butyl rubber is achieved using an atmospheric pressure plasma graft polymerization, involving argon and acrylic acid vapor. The treated PTFE film is then placed over a raw butyl rubber plate and hot-pressed under 157 N/cm2 for 40 min at 150 °C or for 10 min at 180 °C. This procedure results in molecular-level or chemical adhesion between the butyl rubber and the PTFE film. The 180° peeling test results show that a high peeling strength of 3.9 N, per 1 mm sample width, is achieved. Adherend failure of the rubber sheet occurs when the peeling is enforced. From X-ray photoelectron spectroscopy analysis of the treated films, chemical bonds with fluorine atoms are absent from the surface. From scanning electron microscopy analysis, a transparent hydrophilic poly(acrylic acid) layer composed of nanoscale spherical particles is formed. This PTFE-rubber composite material is suitable for high-quality, prefilled medical syringe gaskets.

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Acknowledgments

The authors are grateful to Dr. Zong-Bao Feng (Formerly a researcher of Osaka Prefecture University, currently Token Thermo Tech Co., Ltd.) and Mr. Ken Nakayama (graduate student of Osaka Prefecture University) for their help in the experiments. This study is supported in part by JSPS KAKENHI Grant No. 15K13932.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, 599-8531, Japan

    Masaaki Okubo & Tomoyuki Kuroki

  2. Technology Research Institute of Osaka Prefecture, 2-7-1 Ayumino, Izumi, Osaka, 594-1157, Japan

    Takeshi Onji & Mitsuru Tahara

  3. Hybrid Rubber Products HQS, Sumitomo Rubber Industries, Ltd., 410-1 Kitano, Noguchi-cho, Kakogawa, Hyogo, 675-0111, Japan

    Hiroaki Nakano & Eiji Yao

Authors
  1. Masaaki Okubo
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  2. Takeshi Onji
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  3. Tomoyuki Kuroki
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  4. Hiroaki Nakano
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  5. Eiji Yao
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  6. Mitsuru Tahara
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Correspondence to Masaaki Okubo.

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Okubo, M., Onji, T., Kuroki, T. et al. Molecular-Level Reinforced Adhesion Between Rubber and PTFE Film Treated by Atmospheric Plasma Polymerization. Plasma Chem Plasma Process 36, 1431–1448 (2016). https://doi.org/10.1007/s11090-016-9738-x

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  • DOI: https://doi.org/10.1007/s11090-016-9738-x

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