The total surface tension of thiodiglycol was determined experimentally, and its surface tension
components were estimated: γLW = 42 ± 1 mJ m-2, γ+ = 1.1 ± 0.5 mJ m-2, and γ- = 25.0 ± 0.5 mJ m-2.
The Lifshitz−van der Waals component was estimated from experimental values of thiodiglycol/n-alkane
interfacial tensions, measured by the pendant drop method. The γ+ and γ- were estimated using the
additional information of the contact angle of thiodiglycol on a solid substrate with known surface energy
components. Three polymeric substrates were used independently with this purpose: PS, SAN2, and
PMMA. The most consistent set of values was obtained using PMMA. The final establishment of the
values for the surface tension components of thiodiglycol involved a trial and error procedure where the
parameters were slightly changed to reproduce the previously calculated surface energy components of
the three polymer substrates. This study reinforced the idea that the estimation of the surface free energy
components of a liquid (or solid) is highly dependent on the calculation method and on the systems used
to perform the calculations.
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