Adsorption of certain high polymers by carbon black in dilute solutions

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Abstract
Adsorption experiments were made to determine the time required for a complete adsorption of certain highly molecular substances from solutions. Aluminum oxide was preliminarily subjected to hydrophobization by caproic acid. Samples of polystyrene, polyisoprene, and polyethers of acrylic and methacrylic acids, ranging from methyl to heptyl inclusive, were taken as objects of the experiments. In all cases the time required for a complete extraction of the substances from solution was shown to be directly proportional to square of the characteristic viscosity. “Bad” solvents take a shorter time to effect a complete adsorption. The investigation of adsorption of polyethers of acrylic and methacrylic acids has shown that the increase in the alcohol radical influences the velocity of the adsorption process as a whole in different ways. While the increase in the alcohol radical of the polyacrylic ethers reduces the time required for a practically complete adsorption of the substance, in the case of polyethers of methacrylic acid the reverse relation was observed. Hydrophobic aluminium oxide is shown to adsorb polymethyl acrylate from solution reversibly.
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