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The interfacial interaction between isocyanate and stainless steel

Tardio, Sabrina, Abel, Marie-Laure, Carr, Robert H and Watts, John F (2018) The interfacial interaction between isocyanate and stainless steel International Journal of Adhesion and Adhesives, 88. pp. 1-10.

The interfacial interaction between isocyanate and stainless steel.pdf - Accepted version Manuscript

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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 nitrogen-metal double bond, as consequence of the cycloaddition reaction between isocyanate and metal oxide, are also proposed.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Tardio, Sabrina
Abel, Marie-Laure
Carr, Robert H
Watts, John
Date : 11 October 2018
DOI : 10.1016/j.ijadhadh.2018.10.008
Copyright Disclaimer : © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Uncontrolled Keywords : XPS; ToF-SIMS; Ppolyurethanes, Adsorption isotherm, polymer-metal interactions
Depositing User : Clive Harris
Date Deposited : 11 Oct 2018 07:58
Last Modified : 12 Oct 2019 02:08

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