Enhancing surface adhesion of polytetrafluoroethylene induced by two-step in-situ treatment with radiofrequency capacitively coupled Ar/Ar+CH4+NH3 plasma
PLASMA SCIENCE & TECHNOLOGY(2023)
摘要
Although some progress in plasma modification of the polytetrafluoroethylene (PTFE) surface has been made recently, its adhesion strength still needs to be further improved. In this work, the surface of a PTFE sample was treated with a two-step in-situ method. Firstly, the PTFE surface was treated with capacitively coupled Ar plasma to improve its mechanical interlocking performance; then, Ar+NH3+CH4 plasma was used to deposit an a-CN x :H cross-linking layer on the PTFE surface to improve the molecular bonding ability. After treatment, a high specific surface area of 2.20 and a low F/C ratio of 0.32 were achieved on the PTFE surface. Its surface free energy was increased significantly and its maximum adhesion strength reached 77.1 N & BULL;10 mm(-1), which is 56% higher than that of the single-step Ar plasma-treated sample and 32% higher than that of the single-step Ar+CH4+NH3 plasma-treated sample.
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关键词
adhesion property, surface modification, capacitively coupled plasma, polytetrafluoroethylene
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