Macromolecular Research, Vol.22, No.3, 248-256, March, 2014
On-Line Monitoring of Reaction Temperatures During Anionic Polymerization of Poly(styrene-b-methyl methacrylate) and Poly(styrene-b-2-vinyl pyridine) with a 1,1-Diphenylhexyl Lithium Initiator in THF
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Poly(styrene-b-methyl methacrylate) and poly(styrene-b-2-vinyl pyridine) block copolymers with narrow molecular weight distributions (1.05≤MWD≤1.17) were achieved via a pre-cooled monomer addition method using a diphenyl hexyl lithium initiator in tetrahydrofuran under sequential isothermal conditions. The styrene block was polymerized at -25 and -15 ℃, and the second block copolymerization of PS-b-PMMA and PS-b-P2VP was carried out at -78 ℃. A module-type reactor system was constructed under an inert atmosphere, which could monitor the temperature and torque during polymerization. Monomers for the second block were cooled and maintained at approximately -30 ℃ to control the exothermic reaction temperatures while being added to the reactor. The exothermic reaction temperature could be minimized (ΔTRMAX ≤+11 ℃) by the addition of the pre-cooled monomer.
Keywords:anionic polymerization;poly(styrene-b-methyl methacrylate) block copolymer;poly(styrene-b-2-vinyl pyridine) block copolymer;1,1-diphenylalkyl lithium;reactor for anionic polymerization.
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