Artículos de revistas
Physico-Mechanical Properties of Biodegradable Starch Nanocomposites
Garcia, Nancy Lis; Ribba, Laura Gabriela; Dufresne, Alain; Aranguren, Mirta Ines; Goyanes, Silvia Nair; Physico-Mechanical Properties of Biodegradable Starch Nanocomposites; Wiley VCH Verlag; Macromolecular Materials and Engineering (print); 294; 3; 3-2009; 169-177
Garcia, Nancy Lis
Ribba, Laura Gabriela
Aranguren, Mirta Ines
Goyanes, Silvia Nair
Nanocomposites of cassava starch reinforced with waxy starch nanocrystals were prepared. They showed a 380% increase of the rubbery storage modulus (at 50 °C) and a 40% decrease in the water vapor permeability. X-ray spectra show that the composite was more amorphous than the neat matrix, which was attributed to higher equilibrium water content in the composites. TGA confirmed this result and its thermal derivative suggested the formation of hydrogen bonding between glycerol and the nanocrystals. The reinforcing effect of starch nanocrystals was attributed to strong filler/matrix interactions due to the hydrogen bonding. The decrease of the permeability suggests that the nanocrystals were well dispersed, with few filler/filler interactions.