“Relathionship between Structure and Properties of Modified Potato Starch Biodegradables Films”.

CYRAS, VIVIANA P.; TOLOSA ZENKLUSEN, M.CAROLINA; VAZQUEZ, ANALÍA

JOURNAL OF APPLIED POLYMER SCIENCE

John Wiley and Sons, Ltd

Lugar: New York; Año: 2006 vol. 101 p. 4313 - 4319

0021-8995

Potato starch was gelatinized in the presence of water and varying amounts of glycerol, at 90°C.  Starch/glycerol films were prepared by casting, with water.  The addition of glycerol produces a decreasing in the crystallinity of the starch in the films.  Starch was acetylated (with acetic acid and anhydride) and maleated (with maleic anhydride).  Differential scanning calorimetric (DSC) analysis revealed decrease in the glass transition temperature (Tg) with the chemical modification.  The starch modification on the equilibrium moisture content was determined at 25ºC. The esterifications produce a decrease in the maximum moisture sorption.