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We study adsorption-desorption kinetics of polymer chains at a solid surface. Protio polystyrene, adsorbed from cyclohexane to a single surface of oxidized silicon, was displaced by deuterio poly- styrene. A single time constant, ₎₅₅, described displacement for a significant time (1--2 h). An aging effect, in which ₎₅₅ continued to increase even after mass adsorbed had equilibrated, implied surprisingly slow rearrangements of adsorbed chains in the direction of conformational equilibrium. After equilibration, ₎₅₅ increased exponentially with length of adsorbed chains.
Frantz et al. (Mon,) studied this question.
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