Study on triazine thiols. VI. Selective graft copolymerization of MMA on modified copper plates

Graft copolymerization of MMA on copper surface which is initiated by Na₂S₂O₈ in an aqueous solution proceeded selectively when copper plates are modified by 6-unsaturated group-1,3,5-triazine-2,4-dithiol monosodium salts (UTD) and 6-dimethylamino-1,3,5-triazine-2,4-dithiol monosodium salt (DMTD). Grafting weight was influenced by the molar ratio of UTD to DMTD in the aqueous solution that copper plates are treated. The former on copper surface is a coupling component of MMA radicals and initiator radicals. The latter is a catalyst which accelerates the formation of radicals acting with Na₂S₂O₈. Selective graft copolymerization is due to the reason that radicals generate selectively in the neighborhood of copper surface and in this place there are monomers such as MMA and UTD.