Pectin/microwax composites for surface coating and protection

A novel coating for surface protection of artwork was investigated by the development of biofilms based on pectin matrix filled with halloysite/wax microspheres. Firstly, we prepared Pickering emulsion (PE) of wax/halloysite by following the protocol reported in our previous works. Then, Pectin (PEC) was added to the Pickering emulsions. The dispersion was observed by digital microscope, which evidenced that the sizes of the wax droplets is affected by the biopolymer addition. The physico-chemical properties of the film, which was obtained by the solvent casting method, were investigated by water Contact Angle experiments, UV–vis Spectroscopy and Dynamic mechanical analysis (DMA). Transparency analysis and the effects of the halloysite/wax microspheres on the hydrophobic/hydrophilicity character of the biofilm proved that the nanocomposite system represents a promising coating for surface protection. Pure pectin and pectin/microwax films were investigated by DMA analysis to determine their tensile properties. The proposed coating is environmentally friendly and a good strategy for the protection of stone artwork's surfaces.