アクリロニトリルの水系析出重合反応速度

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  • Rate of Precipitation Polymerization of Acrylonitrile in Aqueous Solution

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The precipitation polymerization of acrylonitrile was carried out in aqueous solution initiated by Na2S2O5/NaNO2 redox catalyst system to analyze the reaction process of precipitation polymerization over a wide range of conversion.<BR>The experimental results can be explained by the following. Reaction takes place individually, both in the liquid phase in which monomer is dissolved in water, and in the polymer phase formed by the precipitation of the polymer. A part of monomer is adsorbed in the precipitated polymer. Radicals in the liquid phase are able to enter into the polymer phase with the aid of collision and then monomer radicals generated in a polymer particle by chain transfer reaction are able to escape from the polymer particle with the aid of diffusion.<BR>Based on this reaction scheme, the equation of the over-all reaction rate was derived and then the apparent velocity coefficients were obtained. These values approximately agreed with the values obtained in the homogeneous reaction in several solvents.

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