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Research article - Peer-reviewed, 2014

Impact of the Coating Process on the Molecular Structure of Starch-Based Barrier Coatings

Menzel, Carolin; Koch, Kristine

Abstract

Molecular analysis of starch structure can be used to explain and predict changes in physical properties, such as water vapor and oxygen barrier properties in packaging materials. Solution casting is a widely used technique to create films from starch formulations. This study compared the molecular properties of these standard films with those of experimental coatings applied to paper in laboratory-scale and pilot-scale trials, with all three techniques using the same starch formulation. The results revealed large differences in molecular structure, i.e., cross-linking and hydrolysis, between films and coatings. The main differences were due to the shorter drying time allowed to laboratory-scale coatings and the accelerated drying process in pilot trials owing to the high energy output of infrared dryers. Furthermore, surface morphology was highly affected by the coating technique used, with a rougher surface and many pinholes occurring in pilot-scale coatings, giving lower water vapor permeability than laboratory-scale coatings. (C) 2014 Wiley Periodicals, Inc.

Keywords

biopolymers & renewable polymers; coatings polysaccharides; properties and characterization; structure property relations

Published in

Journal of Applied Polymer Science
2014, volume: 131, number: 23
Publisher: WILEY-BLACKWELL

Authors' information

Menzel, Carolin
Swedish University of Agricultural Sciences, Department of Food Science
Swedish University of Agricultural Sciences, Department of Food Science

UKÄ Subject classification

Food Science
Polymer Chemistry

Publication Identifiers

DOI: https://doi.org/10.1002/app.41190

URI (permanent link to this page)

https://res.slu.se/id/publ/66696