Issue 40, 2019, Issue in Progress
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RSC Advances

Influence of air contamination during heat-assisted plasma treatment on adhesion properties of polytetrafluoroethylene (PTFE)†

Yuji Ohkubo, ORCID logo *a   Tetsuya Nakagawa,a   Katsuyoshi Endoa  and  Kazuya Yamamuraa  

* Corresponding authors

a Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
E-mail: okubo@upst.eng.osaka-u.ac.jp

Abstract

Plasma surface treatment is typically not effective on fluoropolymers containing polytetrafluoroethylene (PTFE). It is reported that heat-assisted plasma (HAP) treatment at high temperatures (above 200 °C) under atmospheric pressure helium (He) plasma improves the adhesion properties of PTFE. In this study, we investigated the influence of the air concentration during HAP treatment on the adhesion properties of PTFE. Air concentration was controlled via ambient air inflow amount, in other words, base pressure. The PTFE samples HAP-treated in different air concentrations were thermally compressed with an unvulcanized isobutylene–isoprene rubber (IIR). Then, the PTFE/IIR adhesion strength was measured via T-peel test. We show that, when PTFE was HAP-treated in 0.01% air, its PTFE/IIR adhesion strength was over 2 N mm−1; the IIR underwent cohesion failure. However, the PTFE/IIR adhesion strength drastically decreased in the presence of air contamination. The relationships between air concentration during HAP treatment, adhesion properties of PTFE, surface chemical composition, surface morphology, and surface hardness were investigated and discussed.

Graphical abstract: Influence of air contamination during heat-assisted plasma treatment on adhesion properties of polytetrafluoroethylene (PTFE)

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Article information

DOI
https://doi.org/10.1039/C9RA01789E
Article type
Paper
Submitted
08 Mar 2019
Accepted
12 Jul 2019
First published
24 Jul 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 22900-22906

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Influence of air contamination during heat-assisted plasma treatment on adhesion properties of polytetrafluoroethylene (PTFE)

Y. Ohkubo, T. Nakagawa, K. Endo and K. Yamamura, RSC Adv., 2019, 9, 22900 DOI: 10.1039/C9RA01789E

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