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- W2017202330 abstract "We conducted 1,3-butadiene polymerization at 0 and 18 °C using CoX2 (X = halogen) combined with MAO to elucidate the role of halogen ligands attached to cobalt. With increasing the polymerization time, the molecular weight distribution curves of the polymers obtained progressively shifted to higher molecular weight regions accompanied by narrowing polydispersity, irrespective of the cobalt halides employed. The polymer yield linearly increased after an exponential induction stage, while the number-average molecular weight linearly increased vs. polymerization time. Thus, the number of polymer chains calculated from the polymer yield and the number-average molecular weight increased with polymerization time. After a certain polymerization time, the number of polymer chains was saturated to be about 60% catalyst efficiency in the CoCl2 and CoBr2 systems but only about 2% in the CoI2 system. The number-average molecular weight increases linearly vs. polymer yield from a small positive intercept. These phenomena were interpreted by a slow initiation system without any termination and chain transfer reaction. The kinetic analysis indicated that the rates of initiation were significantly influenced by the nature of the halides and descended in the following order, CoCl2 > CoBr2 > CoI2 > CoF2 = 0, whereas the rates of propagation were independent on variation of halogen ligands. 1H and 13C NMR analyses of the polymers indicated that the microstructure of the resulting polymer was high cis-1,4 irrespective of the halogen ligands. The number of polymer chains of CoI2 as a function of polymerization time." @default.
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- W2017202330 date "2002-06-01" @default.
- W2017202330 modified "2023-10-14" @default.
- W2017202330 title "Effects of halogen ligands on 1,3-butadiene polymerization with cobalt dihalides and methylaluminoxane" @default.
- W2017202330 doi "https://doi.org/10.1002/1521-3935(200206)203:9<1171::aid-macp1171>3.0.co;2-u" @default.
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