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A new form of controlled growth free radical polymerization
Author(s) -
Krstina Julia,
Moad Catherine L.,
Moad Graeme,
Rizzardo Ezio,
Berge Charles T.,
Fryd Michael
Publication year - 1996
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19961110104
Subject(s) - chain transfer , living free radical polymerization , polymer chemistry , catalytic chain transfer , radical polymerization , kinetic chain length , polymerization , reversible addition−fragmentation chain transfer polymerization , living polymerization , copolymer , ionic polymerization , chain growth polymerization , monomer , cobalt mediated radical polymerization , chemistry , dispersity , emulsion polymerization , polymer , materials science , organic chemistry
A new form of controlled growth free radical polymerization leading to narrow polydispersity polymers and/or block copolymers is described. The process is based on the polymerization of monomers in the presence of macromonomers of general structure CH 2 =C(Z)CH 2 (A) n [(A) n = radical leaving group, Z = activating group] and displays many of the characteristics of living polymerizations. The process is most suited to methacrylic monomers but with the appropriate choice of reaction conditions (high temperatures and/or low conversions) it can also be applied to acrylic and styrenic monomers. The macromonomers are conveniently prepared by catalytic chain transfer to alkyl cobalt(III) complexes or by addition‐fragmentation chain transfer. The factors which determine the efficiency of cobalt complexes for molecular weight reduction in free radical emulsion and solution polymerization of methyl methacrylate are also discussed.