Estimation of the Surface Tension Components of Thiodiglycol

Abstract

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.

Estimation of the Surface Properties of Styrene-Acrylonitrile Random Copolymers from Contact Angle Measurements

“…The surface tension components presented in Table 2 for water, diiodomethane, and glycerol were taken from the literature and the surface tension components of thiodiglycol were previously determined by us (35).…”

“…The dynamic advancing contact angle is the angle ob- (35) served when the triple phase contact line (TPCL) is forced to advance on the dry solid surface. When this movement is stopped the TPCL is allowed to achieve an equilibrium configuration, and the contact angle observed at that time is denominated static advancing contact angle (SACA).…”

“…The films produced did not show any glass transition depression relative to the polymers, in the form of granules, that were used as starting materials. The quality of the films obtained using the procedure described above was checked by optical and atomic force microscopy (32).…”

Water-Induced Hydrophobicity of Soy Protein Materials Containing 2,2-Diphenyl-2-hydroxyethanoic Acid

“…TDG (bp = 164−166 °C, mol wt = 122.19, and density = 1.182 g/cc) and DPHEAc (mp = 149−151 °C, mol wt = 228.25) were purchased from Sigma and were used as received. The Lifshitz-van der Waals component for TDG has been reported to be 42 ± 1 mJ m −2 . Long chain alkyl silane [C n H 2 n +1 Si (OCH 3 ) 3 , n = 11, mol wt = 286, bp = 118 °C] was provided by New Silicon Material Co., Ltd., in Wuhan University.…”

On the interfacial behavior of ionic liquids: Surface tensions and contact angles

“…(1).This assumption is valid when both phases are non-polar and may be a good estimate when only one of them is polar. An alternative method to determine the surface tension components of a liquid is based on the knowledge of liquid-liquid interfacial tensions between that liquid and a series of test liquids showing a wide spectrum of polarities [8]. However, this method can not be applied in our case due to the high miscibility of ionic liquids with both polar and non-polar test liquids.…”