title: Comparative study of processing methods for starch/gelatin films.
abstract: In this work, the influence of processing methods on the properties of starch/gelatin films plasticized with glycerol and sorbitol is reported. Four different processing techniques: casting; pressing; pressing followed by blowing and extrusion followed by blowing were evaluated. Bioplastics prepared by casting were homogeneous and transparent with lower opacity and water vapor permeability (WVP) values when compared to films prepared by other techniques. Among the cast films studied, those with 3% lipophilic starch, in 1:1 proportions and plasticized with sorbitol, showed lower WVP values and higher tensile strength (TS). Films obtained by pressing and blowing showed little expansion during blow, had cracks in the surface, low TS and higher WVP. These films were the only samples to show crystallinity as determined by thermal analysis and X-ray diffraction. In conclusion, different processing techniques have significantly affected the properties of these films.
authors: School of Chemical Engineering, Department of Polymer Technology, State University of Campinas, UNICAMP, P.O. Box 6066, 13083-970 Campinas, SP, Brazil. farayde@yahoo.com.br
authors: Farayde M
authors: FM
authors: Fakhouri
authors: Daryne
authors: D
authors: Costa
authors: Fábio
authors: F
authors: Yamashita
authors: Silvia M
authors: SM
authors: Martelli
authors: Rodolfo C
authors: RC
authors: Jesus
authors: Katlen
authors: K
authors: Alganer
authors: Fernanda P
authors: FP
authors: Collares-Queiroz
authors: Lucia H
authors: LH
authors: Innocentini-Mei
mesh_terms: D005780:Gelatin / Q000737:chemistry*; D005990:Glycerol / Q000737:chemistry; D008422:Materials Testing / Q000379:methods; D010539:Permeability; D010969:Plastics / Q000138:chemical synthesis / Q000737:chemistry; D012995:Solubility; D013012:Sorbitol / Q000737:chemistry; D013213:Starch / Q000737:chemistry*
chemical_list: D010969:Plastics; D013012:Sorbitol; D005780:Gelatin; D013213:Starch; D005990:Glycerol