Dynamic Wetting of Filaments in Solutions

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Abstract
Measurements of a velocity which is characteristic of the dynamic wetting behavior of a filament entering vertically into a liquid bath have been made for nylon 66 and polypropylene filaments in a variety of solutions. This velocity, the "rise-canceling velocity," is the linear rate of movement of the filament at which the dynamic contact angle is increased to 90°. The hydrodynamic and surface properties of the solutions were varied by changing the nature of the solvent and solute, the temperature, the concentration, and the molecular weight of the solute. The rise-canceling velocity is controlled by surface interactions when the surface tension of the solution is well above the critical surface tension of the polymer. When liquids show complete wettability, the rise-canceling velocity reflects changes in the viscosity of the liquid. Intermediate situations exist in which both factors appear to be influencing this aspect of dynamic wetting.

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