Journal
JOURNAL OF ADHESION
Volume 88, Issue 8, Pages 665-683Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00218464.2012.682865
Keywords
Chemical adhesion; IR external reflection absorption spectroscopy; Methylene diphenyl diisocyanate; Native metal surfaces; Polypropylene ether triol
Funding
- 3M
- Bayer MaterialScience AG, Germany
- National Research Fund, Luxembourg
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Understanding of fundamental adhesion is a key issue for bonding, polymer composites, and coatings. In this study, diluted solutions of polyurethane monomers (methylene diphenyl diisocyanate isomer mixture-MDI, polypropylene ether triol-PPET) are exposed to the native surfaces of Au, Al, and Cu. The adsorption state of the molecules (from multi-to sub-monolayers) is investigated in situ by infrared external reflection absorption spectroscopy (IR-ERAS). A sequence of solvent rinsing steps helps to distinguish physisorbed from chemisorbed molecules. PPET sticks very weakly to the metals. The spectra reveal a bulk-like state. MDI adsorbs weakly on Au but the spectra differ significantly from the bulk state. On Al and Cu, MDI establishes strong adhesion. Rich new spectral features indicate a probably chemical nature of adhesion, and a specific structure in the neighboring adsorbate layer. However, detailed final conclusions on the adhesion mechanisms must not be derived without appropriate quantum mechanical modeling.
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