A New Ozonated Cassava Film with the Addition of Cellulose Nanofibres: Production and Characterization of Mechanical, Barrier and Functional Properties

Abstract

In this study cassava starch modified by ozone technology and cellulose nanofibres were used to produce films. These nanocomposites were produced by casting technique using non-modified and ozonated cassava starches, glycerol and, water reinforced with cellulose nanofibres (NCF) at 1%, 2%, and 5%. Films were characterized in terms of mechanical, barrier and functional properties, morphology, opacity and the sealing ability. In general, ozonated cassava films result in increased mechanical properties, water vapour permeability, and hydrophilicity. The addition of cellulose nanofibres, in certain conditions, improved these properties due to the NCF dispersion in the polymeric matrix. However, the formation of agglomerates in higher concentrations (2% and 5%) was visible by SEM images. In specific, the addition of 1% of NCF to the 60 min ozonated film increased the Tensile Strength and the Young Modulus in ~ 117% and ~ 137%, respectively, and decreased the water vapour permeability in ~ 47%, in comparison to the non-modified film without NCF. In conclusion, the addition of NCF to ozonated cassava films improved their properties aiming specific application showing to be an interesting alternative for packaging industries in different areas.