The interfacial interaction between isocyanate and stainless steel |
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| Affiliation: | 1. The Surface Analysis Laboratory, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK;2. Huntsman PU, Everslaan 4, B-3078 Everberg, Belgium;1. Materials Science Centre, Indian Institute of Technology, Kharagpur, 721302, West Bengal, India;2. Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069, Dresden, Germany;3. Organic Chemistry of Polymers, Technische Universität Dresden, 01062, Dresden, Germany;4. Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41, Bratislava, Slovakia;1. College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, China;2. Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin, China;3. Institute of Advanced Technology, Heilongjiang Academy of Sciences, Harbin, China;1. Universidade Estadual Paulista-UNESP, Instituto de Química, 14800-060, Araraquara, SP, Brazil;2. Centro de Química Estrutural-CQE, DEQ, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal |
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| Abstract: | The interfacial interactions between methylene diphenyl di-isocyanate (MDI) and polymeric MDI (PMDI) with 316L stainless steel have been studied in order to understand the adhesion properties of polyurethane based adhesives (containing free isocyanate groups) on metal surfaces. A thin (<5 nm) layer of MDI and PMDI was deposited on the surface of clean 316L stainless steel and then analysed by X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (ToF-SIMS). By using density functional theory (DFT) methods for the interpretation of XPS data, the presence of specific interactions between the adsorbate and the substrate was established. The reaction between isocyanate and metal hydroxyl groups with the formation of urethane-like bonding with the metal was observed. The formation of hydrogen bonds between the isocyanate nitrogen and the hydroxyl groups and the formation of a nitrogen-metal double bond, as a consequence of the cycloaddition reaction between isocyanate and metal oxide, are also proposed. |
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| Keywords: | XPS ToF-SIMS Polyurethanes Adsorption isotherm Polymer-metal interactions |
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