title: Mechanical and barrier properties of starch-based films plasticized with two- or three component deep eutectic solvents.
abstract: The aim of this work was to prepare two- and three-components deep eutectic solvents (DES) and investigate their potential as starch plasticizers. Starch/DES films were prepared via casting method. Mechanical properties, water vapor- and oxygen transmission rates were measured; additionally contact angle and moisture sorption were determined and FTIR analysis was applied on the films. Native potato starch and hydroxypropylated and oxidized starch (HOPS) with common plasticizers (e.g. polyols, urea) and DES were studied. Moreover, influence of three methods of DES introduction and concentration of plasticizer on the films properties were compared. HOPS films were prepared by two methods: as non-cured and cured samples. Some of DESs containing citrate anion exhibited crosslinking ability of polysaccharide matrix. Non-cured HOPS/DES films exhibited more favourable mechanical and barrier properties than cured analogue films. Samples prepared with unmodified potato starch had higher mechanical and barrier properties than films made with HOPS. Starch-based films plasticized with novel DESs with parallel crosslinking activity exhibited satisfactory mechanical and barrier properties.
authors.affiliation: West Pomeranian University of Technology, Polymer Institute, ul. Pulaskiego 10, 70-322 Szczecin, Poland; Department of Chemical Engineering and Chemical Sciences, Karlstad University, SE-651 88, Sweden. Electronic address: mzdanowicz@zut.edu.pl.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Zdanowicz
authors.affiliation: Department of Chemical Engineering and Chemical Sciences, Karlstad University, SE-651 88, Sweden.
authors.forename: Caisa
authors.initials: C
authors.lastname: Johansson
keywords: Barrier properties; Crosslinking; Deep eutectic solvent; Mechanical properties; Plasticizer; Starch