EFFECT OF SOLVENT POLARITY ON FUNCTIONALIZED POLYETHYLENE SOLUTION INTERFACES
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Entrapment functionalized films containing dansyl fluorescent labels were prepared and changes in the polymer-solution interface were investigated as a function of solvent polarity. Changes in the emission maximum, the extent of fluorescence quenching, and the rate of fluorescence quenching showed that the polymer-solution interface depth varied depending on the polarity of the solvent used. Functional groups in the polymer-solution interface existed in one of three types of chemical environmentsthe bulk of the polymer where functional groups were unreactive to reagents in solution and in which they did not interact with solvent, an interfacial region where soluble reagents could react with the functionalized polymer to varying extents but in which the reactivity of external reagents was approximately the same regardless of the external solvent, and a highly solvated region where the functional groups acted as if they were in solution and where the polyethylene-bound dansyl were readily accessible to reagents in solution. 1990, American Chemical Society. All rights reserved.