Abstract
A novel initiator system, benzyl chloride / 1-octanol-substituted MoCl5 / triphenyl phosphine (PPh3), was applied to the atom transfer radical polymerizations (ATRP) of both butadiene and styrene as well as their copolymerization. Characterization revealed a linear increase in the number average molecular weight with monomer conversion and rather wide molecular weight distributions of the polymerization products. Increasing the polymerization temperature promoted the reaction rate and narrowed the polydispersity index of polystyrene proportionally. The polymerization rule for butadiene catalyzed by the above Mo-based system catalyst is similar to that of styrene. The microstructure of the butadiene was investigated by IR and 1H NMR. IR, 13C NMR and DSC measurements showed that the butadiene and styrene copolymer was a random copolymer. The chlorine atom at the ω end group of the polymer and the change in the valence state of molybdenum, as explored by UV-Vis spectroscopy, revealed that the polymerization proceeded in a manner closest to the mechanism of ATRP.
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The authors are thankful to the National Natural Science Foundation of China (No. 50603009) for financial support.
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Hua, J., Xu, H., Geng, J. et al. Atom transfer radical polymerizations of styrene and butadiene as well as their copolymerization initiated by benzyl chloride / 1-octanol-substituted MoCl5 / PPh3 . J Polym Res 18, 41–48 (2011). https://doi.org/10.1007/s10965-010-9389-1
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DOI: https://doi.org/10.1007/s10965-010-9389-1