Neutron Reflectivity on the Mobile Surface and Immobile Interfacial Layers in the Poly(vinyl acetate) Adsorption Layer on a Si Substrate with Deuterated Toluene Vapor-Induced SwellingClick to copy article linkArticle link copied!
- Tsukasa Miyazaki*Tsukasa Miyazaki*Email: [email protected]. Phone: +81-29-219-5300. Fax: +81-29-219-5311.Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society, 162-1 Shirakata, Tokai, Naka, Ibaraki 319-1106, JapanMore by Tsukasa Miyazaki
- Keisuke ShimokitaKeisuke ShimokitaFunctional Base Products Sector, Nitto Denko Corporation, 18 Hirayama, Nakahara, Toyohashi, Aichi 441-3194, JapanDepartment of Life Science and Applied Chemistry, Gradual School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, JapanMore by Keisuke Shimokita
- Katsuhiro YamamotoKatsuhiro YamamotoDepartment of Life Science and Applied Chemistry, Gradual School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, JapanMore by Katsuhiro Yamamoto
- Hiroyuki AokiHiroyuki AokiMaterials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki 319-1195, JapanInstitute of Materials Structure Science, High Energy Accelerator Research Organization, 203-1 Shirakata, Tokai, Ibaraki 319-1106, JapanMore by Hiroyuki Aoki
- Norifumi L. YamadaNorifumi L. YamadaInstitute of Materials Structure Science, High Energy Accelerator Research Organization, 203-1 Shirakata, Tokai, Ibaraki 319-1106, JapanMore by Norifumi L. Yamada
- Noboru MiyataNoboru MiyataNeutron Science and Technology Center, Comprehensive Research Organization for Science and Society, 162-1 Shirakata, Tokai, Naka, Ibaraki 319-1106, JapanMore by Noboru Miyata
Abstract
We investigated the polymer chain dynamics in a 2–3 nm thick poly(vinyl acetate) (PVAc) adsorption layer on a Si substrate with a native oxide layer via neutron reflectometry combined with toluene vapor-induced swelling. We can investigate the polymer chain dynamics difference in the film thickness direction by the difference in the degree of swelling of the polymer layers detected by neutron reflectometry. The mobility of the polymer chains depends on the distance from the substrate. The results elucidated that the interfacial layer with a thickness of approximately 1 nm did not swell at all with toluene vapor, which is a solvent for PVAc. Meanwhile, the surface layer excessively swells with toluene vapor compared to the bulk. This indicates that the polymer chain within the interfacial region is immobilized by the substrate through hydrogen-bonding interaction, but in the surface region, the surface effect overcomes this interfacial interaction. We concluded that the polymer chains in the adsorption layer are either strongly constrained to the substrate, owing to hydrogen bonding, or more mobile than the bulk, owing to the surface effect.
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