Abstract
Organic-inorganic hybrid coatings were prepared by the sol-gel method using tetraethoxysilane (TEOS) with silane coupling agents: γ-methacryloxypropyltrimethoxysilane (MPTMS) and γ-methacryloxypropyldimethoxymethylsilane (MPDMS). To prepare polymers for the sol-gel process, polymerization of MPTMS or MPDMS and copolymerization of methyl methacrylate (MMA) with MPDMS were performed by radical reactions. Transparent, colorless, and crack-free coatings lμm in thickness were obtained on metal substrates (silver, copper, and aluminum) after heat treatment at 150℃ from sol solutions with TEOS/methacrylate molar ratios of 0.1-0.4. The coatings derived from polyMPTMS-TEOS sol and polyMPDMS-TEOS sol were insoluble in ethanol, acetone, and tetrahydrofuran, while the coating derived from poly(MMA-co-MPDMS)-TEOS sol was soluble in these solvents. The former coatings showed higher wear and heat resistance than the latter. Furthermore, we examined the effect of addition of γ-mercaptopropyltrimethoxysilane (MerPTMS) into the polyMPDMS-TEOS system on adhesion to the silver substrate by X-ray photoelectron spectroscopy (XPS).
