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Chain transfer polymerization of methyl methacrylate initiated by organolanthanide complexes
Author(s) -
Nodono Mitsufumi,
Tokimitsu Toru,
Tone Seiji,
Makino Takayuki,
Yanagase Akira
Publication year - 2000
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20001101)201:17<2282::aid-macp2282>3.0.co;2-k
Subject(s) - chain transfer , living polymerization , kinetic chain length , chemistry , polymer chemistry , polymerization , catalytic chain transfer , chain termination , methyl methacrylate , samarium , reversible addition−fragmentation chain transfer polymerization , polymer , end group , radical polymerization , organic chemistry
A novel chain transfer polymerization mediated by Cp* 2 Sm(III) species and organic acids is described. The chain transfer polymerization involves the reaction of organic acids such as thiols or ketones with an active bond between samarium(III) and the enolate at a living chain end of poly(methyl methacrylate) (PMMA). This chain transfer reaction resulted in termination of the living chain end and the regeneration of the active initiator which would consist of (C 5 Me 5 ) 2 Sm(III) and deprotonated organic acids. The chain transfer polymerization were confirmed by turnover numbers (TON). tert ‐Butyl thiol exhibited the chain transfer reactivity effectively to control the molecular weight of PMMA without decreasing of the polymer yield and the stereoregularity. As a result of this chain transfer polymerization, thermal and optical properties of the PMMA obtained were improved by the control of chain end groups or by reducing a large amount of the samarium initiator.