Graft copolymers controlled initiation, scheme

In addition to the interconversion of polymerisation processes, combination of two polymerisations offer new routes to macromolecular architecture. Recent work has demonstrated that ROMP was the method of choice to prepare polymacromonomers within high yields and with precise control of the size. Based on the combination of ROMP and anionic polymerisation random and block copolymacromonomers and graft copolymers have been prepared using the Schrock well defined molybdenum initiators (Schemes 1 and 2. ... 

Graft copolymers containing styrene in the main chain and other monomers in their side chains are available by numerous methods, including conventional radical [171], controlled radical, anionic [174], and cationic [175] polymerization and by copolymerization of macromonomers [80,174], Grafting methods via conventional radical polymerization are reviewed by Nuyken and Weidner [171], The following reaction scheme demonstrates the principles and universality of the methods applying polymeric initiators ... 

Scheme 10 PP-h-PMMA diblock copolymer prepared by PP-r-B polymer (macro-initiator) and a borane-mediated control radical graft-from polymerization...

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