Dynamics of Poly(Vinyl Acetate)-d₃ on Silica

Robert D. O'Connor
Frank D. Blum, Missouri University of Science and Technology
Gu Xu, Missouri University of Science and Technology

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Poly(vinyl acetate) (PVAc) is an important polymer in applications because of both its bulk and surface characteristics. Its chain architecture gives it a low Tg and, generally, good qualities for processing and applications, which include paints, adhesives, thin films and surface coatings. In this study, we investigate the surface dynamics of PVAc absorbed onto silica with deuterium nuclear magnetic resonance (2H NMR). For dynamics studies, 2H NMR is an excellent technique because it uses an innocuous probe that can report on correlation times (τc) from approximately 10-8 s to 10 s. We report the use of two-dimensional exchange NMR (2D-X) and a side-chain methyl-d3 probe to investigate surface dynamics with τ c s in the range of 10-6 to over 1 s.