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By J. D. Andrade (auth.), J. D. Andrade (eds.)

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Table 9. 8 aUnits in dyne/cm 2 b Units in % cUnits in dyne/cm 2 Contact-angIe-induced deformation can lead to relatively large errors in contact angle for low modulus and high-water-content gels. Rusanov expressed the connection between the contact angles on flat and deformed surfaces and calculated the dependence of l:!. cos 8' on cos Eb under certain condi tions. (9) In Eq. (15), cos 8 and cos 8 ' are rather complex functions o of surface characteristics. 8'for the polymer system under study is performed.

15) works. So, the extent of deformation is somewhat different according to the systems used in contact angle measurements. 3-4 FORTES'S TREATMENT Both Lester(15) and Rusanov(16) admitted that the pressure change between the solid regions contacted by two liquids occurs at the interfacial layer between the two liquids, with a definite thickness of the order of molecular dimensions. Since the pressure distribution within the interfacial layer is not known from theory, they assumed a uniform pressure in this layer, with a value that can be calculated from equilibrium considerations.

Good, A theory for the estimation of surface and interfacial energies. I. Derivation and application to interfacial tension, J. Phys. Chem. 61, 904 (1957). s. Wu, Caculation of interfacial tension in polymer sy,stem, J. Polym. Sci. C 34,19 (1971). S. Wu, J. Adhesion 5, 39 (1973). T. Matsunaga and Y. Ikada, Dispersive component of surface free energy of hydrophilic polymers, J. Colloid Interface Sci. 84, 8 (1981). 31. 32. 33. 34. 35. 36. 37. 38. 39. H. S. Jhon, Temperature dependence of contact angle at polymer-water interface, J.

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