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The Surface Analysis Laboratory A Study of the Interfacial Interaction between Methylene Diphenyl Diisocyanate (MDI) and Metals by XPS Sabrina Tardio Department.

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Presentation on theme: "The Surface Analysis Laboratory A Study of the Interfacial Interaction between Methylene Diphenyl Diisocyanate (MDI) and Metals by XPS Sabrina Tardio Department."— Presentation transcript:

1 The Surface Analysis Laboratory A Study of the Interfacial Interaction between Methylene Diphenyl Diisocyanate (MDI) and Metals by XPS Sabrina Tardio Department of Mechanical Engineering Sciences The Surface Analysis Laboratory 2 July 2014

2 The Surface Analysis Laboratory Project Aim MDI Stainless steel (316L) Iron Molybdenum Nickel Chromium Interface interaction In order to understand the adhesion of PU on metal substrates.

3 The Surface Analysis Laboratory Isocyanate Reactivity Stainless steel surface is made of metal oxide, metal hydroxide and adsorbed water. This is our research imperative!

4 The Surface Analysis Laboratory C1s High Resolution Spectra Steel (with carbon contam.) Pure MDI Interface: 3 nm of MDI on stainless steel New peak indicate the formation of a M-C bond: Organometallic complex??

5 The Surface Analysis Laboratory C1s N=C=O Region Pure MDI Steel (with carbon contam.) Interface

6 The Surface Analysis Laboratory MDI/Pure Fe: C1s MDI/Fe: «carbidic» peak MDI/Mo and MDI/Ni : no «carbidic» peak but interaction between with nitrogen!!! Interface

7 The Surface Analysis Laboratory Conclusions MDI/Mo and MDI/Ni interfaces M-N interaction New doublets in the metal peaks (see poster!) MDI/Steel and MDI/Fe interfaces: M-C interaction Peak at eV Formation of Peak at eV

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