versión impresa ISSN 0100-4042
GARCIA, Patrícia Salomão et al. Citric acid as multifunctional agent in blowing films of starch/PBAT. Quím. Nova [online]. 2011, vol.34, n.9, pp. 1507-1510. ISSN 0100-4042. http://dx.doi.org/10.1590/S0100-40422011000900005.
Citric acid was used as a compatibilizer in the production of starch and PBAT films plasticized with glycerol and processed by blow extrusion. Films produced were characterized by WVP, mechanical properties, FT-IR-ATR and SEM. WPV ranged from 3.71 to 12.73×10-11 g m-1 s-1 Pa-1, while tensile strength and elongation at break ranged from 1.81 to 7.15 MPa and from 8.61 to 23.63%, respectively. Increasing the citric acid concentration improved WVP and slightly decreased film resistance and elongation. The films micrographs revealed a more homogeneous material with the addition of citric acid. However, the infrared spectra revealed little about cross-linking esterification reaction
Palabras llave : starch; polyester; compatibilization.