Contact angle measurements with three different liquids were performed on: (i) butyl rubber PB 101‐3 (Polysar Ltd.) and (ii) Dow Corning 236 dispersion. Contact angles were measured at different temperatures within the range from 23°C (room temperature) to 120°C. The surface tensions, γsv, of the polymeric coatings at each temperature were calculated from the contact angles. The temperature coefficients of the surface tensions, dγsv/dT, i.e., the surface entropies, were established for the temperature range covered.
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Budziak et al. (1991) studied this question.
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