Dynamics of Adsorbed PMA-d₃ - Effect of Substrate
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In the last few years, our group has focused much of our attention on studying the dynamics of polymers adsorbed at interfaces. Much of our work, to date has been on labeled poly(vinyl acetate)-d3 (PVAc-d3)1 and poly(methyl acrylate)-d3 (PMA-d3)2 on silica. We have been able to probe the effects of adsorbed amount,3 molecular mass,4,5 and the effect of overlayer.6 These studies have provided a view of the adsorbed polymer consistent with a motional gradient in the layer with the more mobile segments being those at the air-polymer interface and the less-mobile segments at the substratepolymer interface. However, we have not probed the effect of the interaction with the substrate. In the present work, we describe the dynamics of PMA-d3 adsorbed on different substrates with a focus on how the substrate affects the dynamics of the polymer. In particular, we examine silica- and alumina-based substrates. For silica we explored the behavior of PMA-d3 on Cab-O-Sil silica, both in its native and hydrophobic form. For alumina we have probed the behavior on both alumina powder and also anopore membranes. We find that the dynamics of the adsorbed polymer depends on the nature of the substrate.