The effects of partitioning of Cu(I) and Cu(II) species to the aqueous medium on the polymerization rate ( R p ), molecular weight and molecular weight distribution in the miniemulsion atom transfer radical polymerization system of styrene/CuBr/4,4‘-dinonyl-2,2‘-bipyridyl at 90 °C were investigated. According to both simulation (invoking the partitioning data for n -butyl methacrylate ( Macromolecules 2000, 33, 7310−7320)) and experiment showed that the R p and polydipersity ( M w / M n ) were higher in miniemulsion than in the corresponding solution polymerization as a result of a decrease in deactivator concentration (Cu(II) species) in the organic phase. Simulations indicated quantitatively that the increase in M w / M n was caused by (i) a decrease of activation−deactivation cycles and (ii) an increase of bimolecular termination.
No takes yet. Share an insight, caveat, or question.
Kagawa et al. (2007) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: