Ohkubo Yuji, Endo Katsuyoshi, Yamamura Kazuya
Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
Sci Rep. 2018 Dec 24;8(1):18058. doi: 10.1038/s41598-018-36469-y.
Conventional low-temperature plasma treatment was reported to minimally improve the adhesion property of polytetrafluoroethylene (PTFE), whereas heat-assisted plasma (HAP) treatment significantly improved the same. An unvulcanized rubber was previously used as an adherent for PTFE. This study aimed to achieve strong adhesive-free adhesion between PTFE and vulcanized polydimethylsiloxane (PDMS) rubber. As-received vulcanized PDMS rubber did not adhere to HAP-treated PTFE, and as-received PTFE did not adhere to vulcanized rubber of plasma-jet (PJ) treated PDMS rubber; however, HAP-treated PTFE strongly adhered to vulcanized PJ-treated PDMS rubber, and both PTFE and PDMS exhibited cohesion failure in the T-peel test. The surface chemical compositions of the PTFE and PDMS sides were determined using X-ray photoelectron spectroscopy. The strong PTFE/PDMS adhesion was explained via hydrogen and covalent bond formation (C-O-Si and/or C(=O)-O-Si) between hydroxyl (C-OH) or carboxyl (C(=O)-OH) groups of the HAP-treated PTFE. This process was also applied to adhesive-free adhesion between a tetrafluoroethylene-perfluoroalkylvinylether copolymer (PFA) and PDMS; subsequently, a translucent PFA/PDMS assembly with strong adhesion was realized together with the PTFE/PDMS assembly. Strong adhesive-free adhesion between fluoropolymers (PTFE, PFA) and vulcanized PDMS rubber without using any adhesives and graft polymer was successfully realized upon plasma treatment of both the fluoropolymer and PDMS sides. Additionally, a PDMS sheet, which was PJ-treated on both sides, was applied to strongly adhere fluoropolymers (PTFE, PFA) to materials such as metal and glass. PJ-treated PDMS was used as an intermediate layer rather than a strong adhesive, achieving PTFE/PDMS/metal and PTFE/PDMS/glass assemblies. The PTFE/PDMS, PDMS/metal, and PDMS/glass adhesion strengths exceeded 2 N/mm.
据报道，传统低温等离子体处理对聚四氟乙烯（PTFE）粘附性能的改善微乎其微，而热辅助等离子体（HAP）处理则能显著改善其粘附性能。此前曾使用未硫化橡胶作为PTFE的粘合剂。本研究旨在实现PTFE与硫化聚二甲基硅氧烷（PDMS）橡胶之间牢固的无粘合剂粘附。原样的硫化PDMS橡胶不粘附于经HAP处理的PTFE，原样的PTFE也不粘附于经等离子体喷射（PJ）处理的PDMS橡胶的硫化橡胶；然而，经HAP处理的PTFE与经PJ处理的硫化PDMS橡胶牢固粘附，并且在T型剥离试验中PTFE和PDMS均表现出内聚破坏。使用X射线光电子能谱测定了PTFE和PDMS面的表面化学成分。经HAP处理的PTFE的羟基（C-OH）或羧基（C(=O)-OH）之间通过氢和共价键形成（C-O-Si和/或C(=O)-O-Si）解释了PTFE/PDMS之间的强粘附力。该工艺也应用于四氟乙烯-全氟烷基乙烯基醚共聚物（PFA）与PDMS之间的无粘合剂粘附；随后，实现了具有强粘附力的半透明PFA/PDMS组件以及PTFE/PDMS组件。在对含氟聚合物和PDMS两面进行等离子体处理后，成功实现了含氟聚合物（PTFE、PFA）与硫化PDMS橡胶之间不使用任何粘合剂和接枝聚合物的强无粘合剂粘附。此外，两面均经PJ处理的PDMS片材用于将含氟聚合物（PTFE、PFA）牢固粘附于金属和玻璃等材料。经PJ处理的PDMS用作中间层而非强力粘合剂，实现了PTFE/PDMS/金属和PTFE/PDMS/玻璃组件。PTFE/PDMS、PDMS/金属和PDMS/玻璃的粘附强度超过2 N/mm。
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