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 transcript:

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

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.

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

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??

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

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

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