Reversible addition-fragmentation chain transfer diblock copolymers prepared

Guan, C.-M. Luo, Z.-H. Tang, P.-P., Poly(dimethylsiloxane-5-styTene) Diblock Copolymers Prepared by Reversible Addition-Fragmentation Chain-Transfer Polymerization Synthesis and Characterization. J.Appl. Polym. Sci. 2010,116, 3283-3290. 

To make further use of the azo-initiator, tethered diblock copolymers were prepared using reversible addition fragmentation transfer (RAFT) polymerization. Baum and co-workers [51] were able to make PS diblock copolymer brushes with either PMMA or poly(dimethylacrylamide) (PDMA) from a surface immobihzed azo-initiator in the presence of 2-phenylprop-2-yl dithiobenzoate as a chain transfer agent (Scheme 3). The properties of the diblock copolymer brushes produced can be seen in Table 1. The addition of a free initiator, 2,2 -azobisisobutyronitrile (AIBN), was required in order to obtain a controlled polymerization and resulted in the formation of free polymer chains in solution. 

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