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Analysis of the coagulation rate of MBS (methylmetacrylate-butadiene-styrene) polymer latex and strength of coagula

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The present study investigated the effect of operating conditions on the mechanical strength of polymer coagula. A latex of MBS (methylmetacrylate-butadiene-styrene) polymer was coagulated in a cylindrical dialysis membrane tube in the temperature range 303-333 K. An aqueous solution of hydrochloric acid (from 2.81 to 1370 mol/m3) was used as the coagulant. A coagulated pellet was obtained in the shape of a hollow or solid cylinder, and the shape of the pellet allowed well defined measurements of the strength of the coagulated pellet. The coagulation kinetics was determined by analyzing the growth rate of the coagulated layer in the tube. The kinetics was well described by the unreacted core model, where the diffusion of hydrochloric acid in the coagulated layer was the rate controlling step. The strength of the pellet increased as the coagulated layer grew larger. Pellet strength was not affected by the coagulant concentration, but increased strength was observed at higher operating temperatures.

Affiliations: 1: Engineering Research Laboratories, Research Institute, Kaneka Corp., 1-8 Miyamae, Takasago, Hyogo 676, Japan


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