There is appreciable uncertainty concerning the magnitude of the fragmentation rate coefficient of the intermediate radical in reversible addition-fragmentation chain transfer (RAFT) polymerizations. A large proportion of the experimental and theoretical evidence suggests that it is a stable species with a lifetime longer than 0.0001 s. This is particularly the case when the intermediate macro-RAFT radical is stabilized by a phenyl group attached to the radical center or has a poor leaving group. Although the occurrence to some extent of irreversible termination reactions cannot be excluded, we argue that such reactions are more likely to be a result of slow fragmentation of the intermediate macro-RAFT radical.
|Number of pages||5|
|Journal||Journal of Polymer Science, Part A: Polymer Chemistry|
|Publication status||Published - 15 Sep 2003|
- Kinetics (polym.)
- Living free-radical polymerization
- Quantum chemistry
- Reversible addition-fragmentation chain transfer (RAFT)