Abstract
The London dispersive component of surface free energy γ s d and the nondispersive interactions with polar liquids W I sw n were determined for hydrophilic polymers S, that is, cellulose, poly(vinyl alcohol) (PVA), and poly(methylmethacrylate) (PMMA). On applying the geometric-mean relation 2(γ s dγ w d) 1 2 to the dispersive interaction with W I sw d, the γ s d values were found to be 30, 29, and 37 erg·cm −2 for cellulose, PVA, and PMMA, respectively. Each of them is completely independent of the nature of the testing liquids W, indicating that the geometric-mean equation is appropriate for representing the dispersive interaction. On the contrary, such a geometricmean expression is shown to be inapplicable to the nondispersive interactions. It is suggested that Fowkes' approach, in which intermolecular forces are regarded to be dominated by dispersion force interactions and electron donor-acceptor interactions, is more reasonable than the popular approach.
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