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ADSORPTION OF METHYLMETHACRYLATE-VINYLFERROCENE COPOLYMERS AT THE SOLUTION/SOLID INTERFACE.

Abstract:

In the reported experiments, a series of methylmethacrylate-vinylferrocene random copolymers was synthesized and characterized. Their adsorption from toluene and chloroform was measured onto pyrogenic silicas. The level of adsorption depended on the solvent, the surface area of the adsorbent, and the copolymer composition. Thus, an inverse adsorption-solubility relationship for toluene and chloroform was observed. However, in solvents such as tetrahydrofuran, 2-butanone, and cyclobutanone, which have strong interaction with silica, this trend was not evident. The compositional dependence of the adsorption of these copolymers in toluene and chloroform is similar. Initially, adsorption tends to increase with the vinylferrocene content in the polymer, and at equimolar copolymer compositions the adsorption reaches a maximum which is followed by a decrease in the adsorption values at high vinylferrocene contents. Gel permeation chromatography (GPC) measurements allowed us to conclude that high molecular weight polymer was preferentially adsorbed. 21 refs.