# Rate Equations of Polymerization Reaction by Reiji Mezaki, Guang-Hui Ma

By Reiji Mezaki, Guang-Hui Ma

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Additional resources for Rate Equations of Polymerization Reaction

Example text

Chem. Copyright 0 1981 John Wiley & Sons, Inc. Reprinted Ed, 19, 3173 (1981). by permission of John Wiley & Sons, Inc. 78 In(kt)=12. 60, - k,: termination rate constant, [dm3/mol sec] a,: weight fraction of polymer, [-I Ballard, M. , Napper, D. , and Gilbert, R. , J. Polym. Sei. Polym. Chem. , 22, 3225 (1984). Copyright 0 1984 John Wiley & Sons, Inc. Reprinted by permission of John Wiley & Sons, Inc. 33 S 0 ~ 5 0 . 84 5 0 ~ 5 0 . 9 9 ) fraction of polymer, [-I k,: propagation rate constant, [dm3/mol * sec] kpo: propagation rate constant in the absence of diffusion, [dm3/mol-sec] 0,:weight Ballard, M.

J, 13, 453 (1981). 51 Methyl methacrylate Bulk polymerization Initiator: 2,2'-azobisisobutyronitrile Temperature: 25°C Initiation I R" + M Propagation Pi," + M Chain transfer +Y Termination by disproportionation P,O + PI," + PI," P,,O Termination by combination P,,O + + + + + + 2R" Pi'' Pnt i o PI, + Y" P, + PI, P,+,, kd ki kP ktW ktd(n,m) ktc(n,in) I: initiator, M: monomer, R" : primary free radical, P," : growing polymer radical containing n units of monomer, P,: dead polymer containing n units of monomer, Y: chain transfer agent.

117, 117 (1968). OX 10'5exp(-29100 cal/RT) for 50-80°C [i]: concentration of species i, [mol/l] R,: initial rate of polymerization, [mol/l. sec] P,: number-average degree of polymerization k: initial rate constant of polymerization, [mol/l*sec] h: decomposition rate constant of initiator, [ l/sec] kin: chain transfer rate constant to monomer, [Vmol. , J. Macrornol. , A5, 1043 (1971). Emulsion polymerization Ingredients: water, polyvinylacetate (PVA), and methylmethacrylate Initiator: polyvinylacetate Temperature: 40°C k,= 140 k,: rate constant of propagation, [I/mol*sec] Allen, P.