Bionanocomposites are formed through the electrostatic interactions of exfoliated clay nanoparticles initially dispersed in an aqueous solution with chitosan macromolecules that are gradually charged in the course of a progressive pH decrease by chemical acidulating agent to exclude the phase separation.Chitosan is a product of the de-acetylation of chitin, which is the second abundant organic compound on Earth after cellulose. Although this polysaccharide presents a huge renewal resource of biomass, of which annual production in nature reaches 100 billion tonnes, it is still almost unutilized, being a biopolymer of significant versatility and promise. 1-3 Clay is a natural mineral that is widely used for making various materials and in many industrial processes. Clay nanoparticles of smectite-type, such as montmorillonite and saponite, dispersed into polymers remarkably improve their material properties including strong reinforcing, increased heat resistance, decreased gas permeability and flammability. 4,5 Their effect is observed after exfoliation into
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