Macromolecular Research, Vol.23, No.1, 100-110, January, 2015
Synthesis of high molecular weight poly(styrene-b-methyl methacrylate) using a plug flow reactor system by anionic polymerization
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Sequential anionic polymerizations of styrene and methyl methacrylate and 2-vinylpyridine in tetrahydrofuran (THF) were conducted in a plug flow reactor system with a static mixer. Polymers [polystyrene (PS), M n : 120×10^(3) g·mol-1, M w /M n : 1.08), poly(methyl methacrylate) (PMMA, M n : 28×10^(3) g·mol-1, M w /M n : 1.09), poly(2-vinylpyridine) (P2VP, M n : 53×10^(3) g·mol-1, M w /M n : 1.08), and PS-b-PMMA (M n : 117×10^(3) g·mol-1, M w /M n : 1.12)] with a precisely controlled high molecular weight were obtained using a 1,1-diphenylhexyllithium initiator in a plug flow reactor system. PS-b-PMMA, PMMA, and P2VP were obtained in the presence of LiCl. The molecular weight distribution, which was related to the mixing efficiency of the static mixer, decreased with increasing flow rate. Additionally, the molecular weight of the polymers could be adjusted by varying the flow rates.
Keywords:plug flow reactor;continuous reactor;static mixer;block copolymer;anionic polymerization;polystyrene;poly(2-vinylpyridine);poly(methyl methacrylate);poly(styrene-b-methyl methacrylate)
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