It is demonstrated by experiment and simulation that the commercially available thioketone 4,4-bis(dimethylamino)thiobenzophenone is capable of controlling AIBN-initiated bulk butyl acrylate polymerization at 80°C. On the basis of molecular weight data and from monomer onversion versus time curves, the associated rate parameters are estimated. The addition rate coefficient, kad, for the reaction of a propagating chain with the thioketone is close to 106 L · mol-1 · s-1 -1 and the fragmentation rate coefficient, kfrag, is around 10-2 s-1 giving rise to large equilibrium constants in the order of 108 L · mol-1. Furthermore, cross-and self-termination of the dormant radical species are identified to be operational.
- Kinetics (polym.)
- Living/controlled free radical polymerization
- Molecular weight distribution
- Thioketone mediated polymerization (TKMP)