Living free radical polymerisation under a constant source of gamma radiation - An example of reversible addition-fragmentation chain transfer or reversible termination?

The primary mechanism for living polymerisation under a source of gamma radiation at low dose rates is shown to be reversible addition-fragmentation chain transfer. This was demonstrated by showing that the initial transfer step determines the success of the polymerisation. When an inappropriate leaving group is chosen for the RAFT agent, the polymerisation is non-living. Under a reversible termination mechanism the 'living'-ness should be independent of this initial transfer step.