Titanium-containing organic-inorganic hybrid (T-SMA) was synthesized by the reaction of styrene/maleic anhydride alternative copolymer (SMA) with titanium chelate (ETE). The coating film was obtained by dip-coating of a T-SMA solution on substrates, such as organic polymers, metals, silicon wafer, and soda lime glass. The adhesion of the coating film of T-SMA was higher than that of the coating film of SMA, ETE, and a corresponding zirconium-containing organic-inorganic hybrid. The pencil hardness of the coating film increased with increases in the molecular weight of SMA and the content of ETE. Moreover, the refractive index of the coating film was almost the same regardless of the molecular weight of SMA, but increased with an increase in the content of ETE.
We reevaluated the relationship between curing reaction and curing condition (temperature and humidity) of lacquer tree paint (urushi) systematically that had been evaluated empirically thus far. As a result, we found two mechanisms involved in the curing of urushi : enzyme-assisted and thermochemical reactions. Talking into account of the two reaction systems, we were able to explain some previously unknown phenomena in curing and properties of the films cured at different conditions.