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Synergistic effect of the sequential intercalation of three types of surfactants in the exfoliation degree of bentonite clay in films of cassava

2018; Elsevier BV; Volume: 266; Linguagem: Inglês

10.1016/j.molliq.2018.07.012

1873-3166

Mayra Kerolly Sales Monteiro, Victor Rafael Leal de Oliveira, Francisco Klebson Gomes dos Santos, Eduardo Lins de Barros Neto, Ricardo Henrique de Lima Leite, Édna Maria Mendes Aroucha, Karyn Nathallye de Oliveira Silva,

biodegradable polymer synthesis and properties

A method of obtaining exfoliated nanocomposite films based on biopolymers has been reported. The method is based on the incorporation of modified bentonite clay by mixing surfactants into a biodegradable matrix. The biopolymer used was cassava starch, which has a high hydrophilicity, which makes it less desirable than synthetic polymers, when used as a film matrix for coating. The improvement of this was proposed with the formation of a nanocomposite matrix by the high exfoliation of the modified bentonite clay used as reinforcement material. The degree of exfoliation of the sequential modification in bentonite with three surfactants throughout the cassava starch film was investigated by XRD, FTIR, AFM, SEM, OM and contact angle. The physicochemical properties of the nanocomposite films were analyzed for water vapor permeability, ductility, opacity, thermal stability and water solubility. Finally, the clay modified in the presence of the three surfactants was the reinforcement material that contributed the most to the physical/chemical properties of the control starch film, among which it reduced 90.6% of the water vapor permeability, as well as 77.43% of the maximum dissolution.