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Comparatively Speaking: Wetting vs. Superwetting
By: Anthony J. O'Lenick Jr., Siltech LLC
Posted: February 2, 2011
page 2 of 3
1. There is no necessary relationship between superspreading on the hydrophobic surface Parafilm and the Draves skin wetting test.
2. The low surface tension of the wetting solution at a short time (< 0.2 sec) is one of the critical conditions for good Draves skin wetting, whereas a low equilibrium surface tension (< 21 mN/m) is a necessary but not sufficient condition for superspreading on Parafilm.
3. Synergism in superspreading is possible with additives having the proper hydrophobicity.
4. Synergism and antisynergism in superspreading are not caused by a further change in the surface tension of the solution.
5. Synergism in superspreading is probably related to the molecular attractive interaction between trisiloxane surfactants and additives.