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The Shull Group |
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45. "Study of the Surface Adhesion of Pressure-Sensitive Adhesives by Atomic Force Microscopy and Spherical Indenter Tests", Paiva, A.; Sheller, N.; Foster, M.D.; Crosby, A.J.; Shull, K.R. Macromolecules, 33, 1871 (2000). (Collaboration with Prof. Mark Foster's group at the University of Akron).
Abstract: Atomic force microscopy allows observation of the adhesive surface and characterization of the adhesive behavior on a nanoscale level, providing new and important information about the behavior of pressure-sensitive adhesives (PSAs). In this research PSAs consisting of poly(ethylene propylene) and the n-butyl ester of abietic acid are studied. Results of nanoindentation measurements indicate two different types of behavior: a viscoelastic behavior in the tackifier-rich domains and a more highly dissipative response in the matrix with a gradual transition behavior in areas close to the interfaces between the domains and the matrix. The adhesive energy appears to be dictated predominantly by the tackifier-rich domains.