WETTABILITY STUDY ON NATURAL RUBBER SURFACES FOR APPLICATIONS AS BIOMEMBRANES

This manuscript reports an experimental study on surfaces of natural rubber membranes modified by incorporation of calcium phosphate particles. In particular, we focused on the wettability, a subject for biological aspects. Five surfaces of natural rubber (NR) membranes (pure, polymer-bioceramic composite (NR-CaP) and three modified surfaces subjected to a simulated body fluid (NR-SBF)) were produced and characterized by confocal Raman-spectroscopy, AFM, SEM and XPS and the results were correlated with the wetting properties. Seven liquids (water, formamide, di-iodomethane, ethylene glycol, hexadecane, simulated body fluid and human blood droplets) were used in different experimental sections. Static and dynamic contact angle measurements were conducted to obtain the solid-liquid tensions, work of adhesion and depinning forces. The incorporation of CaP particles in the polymer decreases the roughness and increases the interfacial adhesion, and there was no dependence between the morphology and equilibrium...