Masashi Kumagai

Radical copolymerization of 1-vinylimidazole and methacryl- or styryl-functional silane coupling agents

For the purpose of developing an effective surface finish for copper, imidazole-silane copolymers were synthesized by radical copolymerization of 1-vinylimidazole and methacryl or styryl silane coupling agents. It was found that the reactivity of 1-vinylimidazole was very low as in the case of the copolymerization with styrene or other vinyl monomers. Monomer reactivity ratios obtained from Kelen-Tudus plots were 0.079 (r1; imidazole) and 1.39 (r2; methacryl silane), and 0.002 (r1; imidazole) and 6.9 (r2; styryl silane). According to the reactivity ratios, it was presumed that the imidazole moiety was sandwiched between the silane groups in the early stage of the copolymerization.

Silane-modified poly(vinylimidazole) corrosion inhibitors for copper

Abstract Fourier-transform infra-red spectroscopy was used to study the thermal stability of silane-modified vinylimidazole copolymers on both KBr plates and copper coupons. The copolymers were synthesized by free-radical polymerization of γ-methacryloxypropyltrimethoxysilane and N -vinylimidazole. The ability of these copolymers to inhibit the oxidation of copper at elevated temperatures was compared to that of poly( N -vinylimidazole). The silane acted as a scavenger for the water released by the imidazole ring during heating. Upon heating, the silane methoxy groups hydrolysed and condensed to form siloxane linkages.

The synthesis and characterization of nitrogen-containing ladder polymers and their model compounds

Abstract The linear polymers obtained by reacting 2,6-diaminotoluene with benzaldehyde or formaldehyde were condensed in polyphosphoric acid or aqueous HC1. The ladder polymers obtained were characterized by 1 H n.m.r., FT i.r., u.v.-vis. and g.p.c.

Synthesis of linear condensation polymer obtained by the reaction of 2,6-diaminotoluene with benzaldehyde

Abstract In the presence of acid, 2,6-diaminotoluene was reacted with benzaldehyde. The obtained polymer was characterized by 1H n.m.r. FTi.r. and U.v.-vis. spectroscopy, g.p.c. and elemental analysis. Model compounds were synthesized in order to confirm the chemical structure of the polymer.