Surface Treatments for Enhanced Bonding Between Inorganic Surfaces and Polymers
Nearly all intermolecular interactions in solution and at interfaces can be reduced to two phenomena: London dispersion forces, and electron donor-acceptor (acid-base) interactions. Hydrogen bonds are included in acid-base interactions, and dipole phenomena are usually negligibly small. Earlier popular notions that all “polar” groups can interact with each other are shown untenable; donor-donor and acceptor-acceptor interactions are negligibly small compared to donor-acceptor interactions. The bonding of polymers to metal surfaces is also governed by donor-acceptor interactions. Semiconducting p-type oxides (as on chromium) are electron-accepting and bond strongly only to polymers with electron-donor groups; n-type oxides (as on aluminum) are electron-donors and bond strongly only to polymers with electron-accepting groups. Some oxides have both kinds of sites. Surface “preparation” of metal oxides usually involves chemical treatments to strengthen donor-acceptor interactions with polymers. Surface analysis techniques allow determination of concentrations and strengths of donor and acceptor groups.
KeywordsContact Angle Acrylic Acid Vinyl Acetate Basic Solvent Basic Liquid
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