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The interfacial interaction between isocyanate and stainless steel

Lookup NU author(s): Dr Sabrina Tardio

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Abstract

© 2018 Elsevier Ltd 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.

Publication metadata

Author(s): Tardio S, Abel M-L, Carr RH, Watts JF

Publication type: Article

Publication status: Published

Journal: International Journal of Adhesion and Adhesives

Year: 2019

Volume: 88

Pages: 1-10

Print publication date: 01/01/2019

Online publication date: 11/10/2018

Acceptance date: 09/10/2018

ISSN (print): 0143-7496

ISSN (electronic): 1879-0127

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.ijadhadh.2018.10.008

DOI: 10.1016/j.ijadhadh.2018.10.008

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