Poly(tertiary amine) as a surface-active multifunctional macro-initiator in Cu 2+ –amine redox-initiated radical emulsion polymerization of methyl methacrylate

摘要: Redox-initiated radical polymerization of methyl methacrylate (MMA) using poly(2-(N,N-dimethylamino)ethyl methacrylate) (PDMAEMA) or poly(N-[3-(N,N-dimethylamino)]propyl methacrylamide) (PDMAPMA) as a surface-active multifunctional reducing agent, vis-a-vis low-molecular-weight (MW) analogs, was performed in aqueous emulsion at 70 °C CuSO4 FeCl3 complexes an oxidizing agent and poly(ethylene glycol) nonionic emulsifier, to examine their effect on emulsification, rate the structure final resultants. The kinetics followed gravimetrically, while MW resultants monitored by gel permeation chromatography. exhibited higher activity than both cases, evolved faster those with low-MW tertiary amines. increased several folds respect pristine PDMAEMA PDMAPMA initially, but adversely decreased further reaction, owing formation free PMMA chains. control experiments suggested that transition metal cation promote hydrolysis ester/amide moieties. CuII-catalyzed occurred steadily during CuII–PDMAEMA redox-initiated MMA, leading gradual accumulation During later stage, primarily pairs CuII amines, giving rise