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Anionic Polymerization of Methyl Methacrylate with the Aid of Lithium Trimethylsilanolate (Me 3 SiOLi) ‐ Superior Control of Isotacticity and Molecular Weight
Author(s) -
Kitaura Takehiro,
Kitayama Tatsuki
Publication year - 2007
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200700259
Subject(s) - tacticity , methyl methacrylate , polymerization , polymer chemistry , anionic addition polymerization , molar mass distribution , poly(methyl methacrylate) , materials science , lithium (medication) , triad (sociology) , methacrylate , polymer , composite material , medicine , psychology , psychoanalysis , endocrinology
Highly isotactic‐specific polymerization of methyl methacrylate (MMA) was developed by using a combined anionic initiator comprising α ‐lithioisobutyrate (Li‐ i PrIB) and a large excess of lithium trimethylsilanolate (Me 3 SiOLi), which afford, in particular, isotactic poly(methyl methacrylate) (PMMA) with isotactic triad content of up to 99.5% under the adjusted polymerization conditions. The polymerization system also exhibited a high activity such that isotactic PMMA with $\overline M _{\rm n}$ of over 800 000 and narrow molecular weight distribution ( $\overline M _{\rm w} /\overline M _{\rm n}$ < 1.2) was obtained.