INVESTIGADORES
MANFREDI liliana Beatriz
congresos y reuniones científicas
Título:
Starch based nanocomposites
Autor/es:
V. P. CYRAS; L. B. MANFREDI; A. VÁZQUEZ
Lugar:
Buenos Aires, Argentina
Reunión:
Congreso; XXII Interamerican Congress of Chemical Engineering y Congreso Argentino de Ingeniería Química; 2006
Institución organizadora:
Asociación Argentina de Ingenieros Químicos
Resumen:
Glycerol–plasticized starch/clay composites films were prepared from potato starch/montmorillonite aqueous suspensions by casting, with two percentages of clay (2 and 5% wt/wt), to study the effect of the nanoclay in the properties of starch. The dispersion of clay in the films was analyzed by X-ray diffraction. It was observed that the 001 diffraction peak of clay was shift to lower angles in the nanocomposites patterns. These results indicated that there was an increment in the interlayer distance of clay in the nanocomposites providing strong evidence that the clay nanolayer formed a disordered intercalated structure without reach a complete exfoliation. An improvement in the thermal resistance of starch with the addition of clay was observed by means of thermogravimetric analysis. This effect was due to the fact that the clay acts as heat barrier enhancing the overall thermal stability of the system.    The absorption of humidity by the nanocomposites was measured in an environment with a 75% of constant relative humidity. It was observed that the maximum of water uptake was reduced by the addition of clay to the starch due to the structure formed between the molecules of starch and the montmorillonite. The hydrophilic character of the materials seems not to be the main parameter affecting the equilibrium moisture uptake.