CONICET | Buscador de Institutos y Recursos Humanos

Functional properties of corn starch based films were improved through the incorporation of nanoclay (Montmorillonite). Nanoclay was incorporated in the polymer matrix through two different methodologies and films were formed by casting. Effect of elaboration methodology and nanoclay concentration on physicochemical properties of films was studied. Depending on elaboration method, intercalated and exfoliated nanocomposites films were obtained. FTIR spectra showed a strong interaction between montmorillonite and starch molecules. Opacity was dependent on nanoclay dispersion method used. Water vapor solubility and permeability decreased with increasing montmorillonite content and they were affected by dispersion method. Water diffusion was only dependent on nanoclay content due to the increase in the diffusion path tortuosity caused by the nanoparticles. Results showed that incorporation of 5% of montmorillonite through adequate dispersion method, improved water resistance and barrier properties of corn starch based films. Nanoparticles reduced the properties damage caused by the increase in moisture content on these hydrophilic films.