Narrow-polydispersity polystyrene/poly[styrene-co-(butyl methacrylate)] block copolymers by an N-oxyl mediated free radical polymerization process
✍ Scribed by Sören Butz; Heike Baethge; Gudrun Schmidt-Naake
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 309 KB
- Volume
- 18
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Polystyrene/poly[styrene‐co‐(butyl methacrylate)] block copolymers with controlled molecular weights and with polydispersities generally below M̄~w~/M̄~n~ = 1,45 and partially as low as M̄~w~/M̄~n~ = 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 for N‐oxyl mediated free radical polymerizations.