Reactions of polymer analogous model substances with metals and oxides
DHC and PCnBE as models of polyurethanes show strong chemical interactions with functional groups at the Al2O3 surface. Degradation of the model compounds occurs by hydrolysis, but DHC decomposes with a higher rate than PCnBE. Addition of water to the coated Al2O3 reduces the decomposition rate by forming a water interlayer, which interrupts the direct interaction at the interface. Blocking the functional groups at the Al2O3 surface by adsorption of a phosphoric acid compound has nearly the same effect and hinders any hydrolysis of the model compound.
Plasma oxidized OTS self-assembling layers, serving as models for polyolefine surfaces, show strong interactions with chromium atoms. One result was the full entanglement of the functionalized alkyl chains, which were preferentially oriented for an untreated OTS self-assembling layer. Strong experimental indications exist for an oxygen transfer from plasma-introduced carboxyl and carbonyl functionalities to chromium atoms which form Cr3+ oxide species.
Key wordsChemical interaction model compounds Al2O3 and chromium molecular orientation formation of complexes plasma
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