Abstract
Abstract Surfaces of model coatings consisting of poly (methyl methacrylate) (PMMA) and poly(ethyl acrylate) (PEA) were analyzed by use of a Wilhelmy plate/microbalance apparatus. When plotted against the PMMA weight per cent, the force extrapolated from the advancing tensiogram exhibits an increasing trend superimposed with a transitional behavior in the form of a valley. In contrast, the force extrapolated from the receding tensiogram shows a decreasing trend, with the transitional behavior taking the form of a peak. A theoretical model based on surface deformation at the solid—liquid contact line has been proposed to explain the observed phenomena. The peaks and valleys in particular may relate to the surface glass transition temperature.
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