Narrow‐polydispersity polystyrene/polystyrene‐co‐(butyl methacrylate) block copolymers by anN‐oxyl mediated free radical polymerization process

摘要

AbstractPolystyrene/polystyrene‐co‐(butyl methacrylate) block copolymers with controlled molecular weights and with polydispersities generally belowM̄w/M̄n= 1,45 and partially as low asM̄w/M̄n= 1,19 were synthesized by a free radical bulk copolymerization using a 2,2,6,6‐tetramethylpiperidine‐N‐oxyl (TEMPO)‐capped polystyrene macroinitiator. The influence of the macroinitiator concentration on the block copolymerization was studied. The polymerization rates are independent of the macroinitiator concentration and are close to that of thermally self‐initiated styrene/butyl methacrylate copolymerizations showing the important role of self‐initiation forN‐oxyl mediated free ra