Improvement in Adhesion Property of PTFE

Improvement in Adhesion Property of Polytetrafluoroethylene (PTFE) via Heat-Assisted Plasma Treatment Using a Heater

Researchers in Japan show how heat asssisted plasma treatment makes a drastic improvement of the adhesion properties of PTFE

A plasma etched PTFE Surface An untreated PTFE Surface


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drastic improvement in adhesion property of ptfe VIA heat assisted plasma treatment using a heater

Yuji Ohkubo, Kento Ishihara, Masafumi Shibahara, Asahiro Nagatani, Koji Honda, Katsuyoshi Endo & Kazuya Yamamura | Scientific Reports 7, Article number: 9476 (2017) | doi:10.1038/s41598-017-09901-y  | Published online: | Courtesy of www.nature.com

ABSTRACT

The heating effect on the adhesion property of plasma-treated polytetrafluoroethylene (PTFE) was examined. For this purpose, a PTFE sheet was plasma-treated at atmospheric pressure while heating using a halogen heater. When plasma-treated at 8.3 W/cm2 without using the heater (Low-P), the surface temperature of Low-P was about 95 °C. In contrast, when plasma-treated at 8.3 W/cm2 while using the heater (Low-P+Heater), the surface temperature of Low-P+Heater was controlled to about 260 °C. Thermal compression of the plasma-treated PTFE with or without heating and isobutylene−isoprene rubber (IIR) was performed, and the adhesion strength of the IIR/PTFE assembly was measured via the T-peel test.

The adhesion strengths of Low-P and Low-P+Heater were 0.12 and 2.3 N/mm, respectively. Cohesion failure of IIR occurred during the T-peel test because of its extremely high adhesion property. The surfaces of the plasma-treated PTFE with or without heating were investigated by the measurements of electron spin resonance, X-ray photoelectron spectroscopy, nanoindentation, scanning electron microscopy, and scanning probe microscopy. These results indicated that heating during plasma treatment promotes the etching of the weak boundary layer (WBL) of PTFE, resulting in a sharp increase in the adhesion property of PTFE.


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