Formation of macromers by transfer

The reaction of an active centre with a transfer agent produces chains in which fragments of the transfer agent are incorporated as chain ends. 

By reactions (82)-(84), 8 wt. % Br was introduced into the oligomers, an average of 1.95 Br atoms per chain. This work was extended by Kennedy and Smith [91] who selected the co-initiator from a group of transfer agents, which thus had a double function. This new technique they called the inifer method (from co-initiator-trans/er agent). When the rate of transfer to monomer is much less than to the inifer, the formation of the reactive macromer end groups can be better controlled. Macromer formation can be represented by the scheme 

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