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In the continuous polymerization for acrylonitrile-vinyl acetate copolymer (93:7 in weight) using persulfate-bisulfite ion initiation system in aqueous medium, effects of polymerization condition and fluid mixing on the molecular weight distribution of the polymer have been studied by simulation using a kinetic model with a continuous reactor. The following results were obtained. 1) Few effect of water/monomer ratio and, bisulfite/persulfate molar ratio were observed on _??_w/_??_n ratio of the polymer. 2) When dimensionless parameter _??_L/2_??_ (L, length of a reactor; _??_, mean velocity of fluid; _??_, mean diffusion coefficient toward direction of flow) was varied from 0 to 20, _??_w/_??_n ratio increased from 2 to approximately 4 as a result of increased conversion, depending on the polymerization conditions. 3) The experimental values of _??_w/_??_n ratio can be explained to some extent from the simulation result described.

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Continuous polymerization of acrylonittile in aqueous medium under the condition of low water to monomer ratio. 9. Effect of polymetrization condition and fluid mixing on the molecular weight distribution of acrylonitrile copolymer with vinyl acetate by continuous polymerization in aqueous medium.