Graded interfaces of polymers on silica
The dynamics of polymers at interfaces are important in a variety of applications, especially where those applications depend on mechanical or surface properties. Surface properties of interfacial species, like polymers used in composites, are not easily measured macroscopically because the interfacial layers are so thin. Microscopic techniques, especially spectroscopic ones, have been successful at probing these interfaces. Spectroscopic techniques can be sensitive to very small amounts of material on the surface and many of these have been reviewed with special emphasis on their use in composite interfaces. (1) We have used deuterium NMR to study the segmental dynamics of specifically labeled polymers on surfaces. The use of this technique applied to thin organic films has been reviewed. (2,3) In particular, we report studies of poly(vinyl acetate)-d3 (PVAc-d3) (4) and poly(methyl acrylate)-d3 (PMA-d3) (5-7) on silica. We find that there exists a motional gradient in the polymers perpendicular to the surface. This motional gradient is a function of the molecular weight and adsorbed amount of polymer.
F. D. Blum, "Graded interfaces of polymers on silica," Silica 2001 ICSI-CNRS, Institut de Chimie des Surfaces et Interfaces, Jan 2001.
National Science Foundation (U.S.)
Article - Conference proceedings
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