Repellency of Textile Assemblies

Abstract

In a series of studies on the relation between the wettability of textile assemblies and their structures, we measured apparent equilibrium contact angles (ϕ_e ) of mono filament nylon and polyester mesh screens to several ethylene glycol derivatives. As a novel measure of wettability of textile assemblies, apparent critical penetration tension (γc^app) has been defined as the surface tension of a liquid that can just penetrate such assemblies. The γ _C ^app values of nylon and polyester screens were 42 ~ 43 and 43 ~ 45 mN / m, respectively, determined by plotting cos ϕ_e against γ_L and extrapolating to cos ϕ(δ), where δ is a critical contact angle determined from a filament radius and the filament spacing. The values of γ_C ^app were practically independent of the geometric structure of mesh screens, and very close to the critical surface tensions γ_C obtained by Zisman plots. We also examined wetting of mesh screens with an aqueous surfactant solution.

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