1997 Volume 70 Issue 12 Pages 772-778
The organic-inorganic hybrid polymer network was obtained by platinum-catalyzed hydrosilylation, as a thermally crosslinking reaction, of poly (oxyvinyl-1, 2- cyclohexylene) (POVCH) / poly (phenylmethylhydrogensiloxane) (PMHS). From the 29Si-NMR analysis of the product as a model reaction of POVCH/PMHS, hydrosilylation was found to occur selectively. The thermally cured films of POVCH/PMHS had glass transition temperatures in the range of 106 to 118°C and showed excellent alkali resistance (0.1 mol/1 KOH ethyl alcohol solution). Compatibility between POVCH and PMHS was excellent. From XPS measurement, the cured films were found to be uniform in composition. The gloss of the cured film of POVCH/PMHS remained stable after the fluorescent UV-condensation cycle test for as long as 2000h. Outdoor exposure was carried out on two kinds of coatings of POVCH/PMHS and acrylic/melamine for three years in Neyagawa. It was found that color change (_??_E) of the unwashed panel of POVCH/ PMHS was 1.2, whereas that of the unwashed panel of acrylic/melamine was 12.0.
