Abstract
Anionic polymerization of methyl methacrylate (MMA) was initiated with chromium and vanadium ate complexes generated by the reaction of transition metal trichloride (MCl3: M = Cr, V) with n equiv of lithium diisopropylamide (LDA) (n = 1–3) and 4-n equiv of phenyllithium (PhLi). The MCl3/n LDA/4-n PhLi systems were capable of polymerizing MMA in a living manner in tetrahydrofuran (THF) at -78°C, giving poly(methyl methacrylate)s (PMMA) with narrow molecular weight distributions (MWD) in high yield, where the number-average molecular weight (Mn) of the PMMAs increased proportionally with monomer to initiator feed ratio. Matrix-assisted laser desorption inonization time-of-flight mass spectrometry (MALDI-TOF-MS) revealed that the anionic polymerization was initiated by the nucleophilic attack of diisopropylamide (iPr2N-) group on the transition metal center of the ate complexes and the growing species was stable under the polymerization conditions.
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Ihara, E., Tanaka, S., Itoh, T. et al. Anionic Polymerization of Methyl Methacrylate Initiated with Chromium and Vanadium Ate Complexes Incorporating Diisopropylamide Ligand. Polym J 35, 972–977 (2003). https://doi.org/10.1295/polymj.35.972
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DOI: https://doi.org/10.1295/polymj.35.972