1988 Volume 45 Issue 6 Pages 457-462
Poly (N-alkyl-2-vinylpyridinium salts) were prepared by the reaction of poly (2-vinylpyridine) with alkyl bromides. The flocculation of kaolin by the polyelectrolytes was investigated by means of i) the measurements of heat of adsorption, and ii) the adsorption of polyelectrolytes onto kalin particles. Results obtained are as follows. 1) The heat of adsorption was exothermic. 2) The amounts of adsorption (the saturated values of adsorption) and the heats of adsorption increased with increasing temperature. 3) The optimum concentrations of polyelectrolytes required to flocculate 0.5g of kaolin were 10-20ppm in a range of pH2-10, the suspensions of kaolin were stable at less than pH2 or more than pH10.4) There was no relationship between the adsorption amounts and the degree of quaternization at a range of 25-53%. 5) These results were well explained by the model of the loop-train-tail type adsorbed conformation.
