Wetting of cork by polymeric adhesives

Abstract

The cohesion of cork agglomerates is determined by the strength of the adhesive joint established between the polymeric adhesive and the cork particles. The ability of adhesives to form good joints depends, among other factors, on the wetting of cork by the adhesives. The main objective of this research was to study the behaviour of adhesive drops deposited on cork substrates through measurements of contact angles and their time dependence. Several polyurethane prepolymers were tested to establish a correlation between the wetting characteristics and the chemical structure and physical properties of the adhesives. The effect of the morphology of cork on the interfacial properties was also investigated. The initial contact angles were related to the chemical nature of the adhesive. The kinetics of the wetting process were found to depend mainly on the viscosity of the adhesive.

Unraveling the Complex Interfacial Properties of Cork-Based Materials in Their Use as Wine Stoppers

“…This is slightly lower than that obtained by Teixeira et al, who obtained values between 60 and 80 mJ•m −2 , depending on the binder used. 11,19 However, this study does not report the standard deviations of the different adhesion works and does not allow for consideration of the heterogeneity brought by the cork surface.…”

“…Another approach by capillary rise measurement was found to be a suitable method for characterizing this material, leading to a reliable surface tension of 22.6 (±1.2) mN·m –1 . In parallel, only a few studies have also focused on the wetting properties of polyurethane binders on the cork surface, by comparing the surface properties of several binders of different chemical natures. ,, Furthermore, the wettability of coating agents on cork has never been studied in detail.…”

“…18 In parallel, only a few studies have also focused on the wetting properties of polyurethane binders on the cork surface, by comparing the surface properties of several binders of different chemical natures. 11,19,20 Furthermore, the wettability of coating agents on cork has never been studied in detail.…”