Improvement of properties of glycerol plasticized starch films by blending with a low ratio of polycaprolactone and/or polyethylene glycol. (May 2016)

• Record Type: Journal Article
• Authors: Ortega-Toro, Rodrigo; Muñoz, Amparo; Talens, Pau; Chiralt, Amparo
• Is Part Of: Food hydrocolloids. Volume 56(2016:May)
• Page Start: 9
• Page End: 19
• Publication Date: 2016-05
• Subjects: Corn starch -- Polycaprolactone -- Polyethylene glycol -- Compression moulding; Cornstarch (PubChem CID: 24836924) -- Polycaprolactone (PubChem SID: 85240250) -- Polyethylene Glycol (PubChem CID: 174 ethylene glycol) -- Glycerol (PubChem CID: 753) -- water (PubChem CID: 952) -- Diphosphorus pentoxide (PubChem CID: 14812) -- Magnesium nitrate (PubChem CID: 25212); Hydrocolloids -- Periodicals; Food additives -- Periodicals; Colloïdes -- Périodiques; Aliments -- Additifs -- Périodiques; Colloids; Food additives; Periodicals; Electronic journals; 664.06
• DOI: 10.1016/j.foodhyd.2015.11.029
• Languages: English
• ISSNs: 0268-005X

Abstract

Abstract: The effect of the melt blending of polycaprolactone (PCL) (5 and 10 wt. %) and polyethylene glycol (PEG 4000 D) (2 wt. %) with corn thermoplastic starch (with 30% glycerol) on film properties was studied through the characterization of the structural, thermal and physical properties of the films obtained by compression moulding, after 1 and 5 storage weeks. PCL and PEG decreased the glass transition temperature of starch, whereas no changes in PCL melting properties were observed. Starch films could incorporate 5% PCL without a notable phase separation, leading to more stretchable and stable films. Blend films with 10% PCL showed clear phase separation, without any improved tensile properties, but with lower water vapour permeability. In ternary systems, PEG reduced the PCL-starch affinity, enhancing phase separation, whereas it did not improve the film properties with respect to starch films. Graphical abstract: Highlights: Polycaprolactone at 5% in starch films was dispersed without a notable phase separation. Addition of 5% polycaprolactone improved stretchability and stability of starch films. Addition of polyethylene glycol to starch–polycaprolactone blends promoted phase separation.