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- W2051217784 abstract "The polymerization of methyl methacrylate (MMA) in toluene at 0°C using combinations of dihexylmagnesium (Hex2Mg) with various metal tert-butoxides as initiators has been studied. Purely anionic initiator systems based on alkali metal salts allow complete conversion of MMA within 1 h to yield either highly isotactic PMMA (LiOt-Bu/MgR2 = 5, M̄n = 61 000, M̄w/M̄n = 1.95, 84% mm) or narrow polydispersity atactic PMMA (NaOt-Bu/MgR2 = 20, M̄n = 39 000 and M̄w/M̄n = 1.18). The combination of Hex2Mg with Nd3(Ot-Bu)9(THF)2 (Nd/Mg = 5–10) affords a novel initiator system that gives in 40–63% yield syndiotactic-rich PMMA (M̄n = 50–90 000, M̄w/M̄n = 1.06–1.12, 76–79% rr) with low initiation efficiency. In this case, characteristics of the polymers and polymerization reactivity data are consistent with the in situ generation of an alkylneodymium species." @default.
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- W2051217784 date "2002-02-01" @default.
- W2051217784 modified "2023-09-25" @default.
- W2051217784 title "Neodymium(III)tert-Butoxide-Dialkylmagnesium, a New Initiator System for Syndiotactic Polymerization of Methyl Methacrylate" @default.
- W2051217784 doi "https://doi.org/10.1002/1521-3935(20020201)203:3<550::aid-macp550>3.0.co;2-h" @default.
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