Deformation mechanisms of plasticized starch materials

• Published in: Carbohydrate polymers Vol. 114; pp. 450 - 457
• Main Authors: Mikus, P.-Y., Alix, S., Soulestin, J., Lacrampe, M.F., Krawczak, P., Coqueret, X., Dole, P.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 19.12.2014; Elsevier
• Subjects: Applied sciences; Chemical Sciences; Engineering Sciences; Exact sciences and technology; Materials; Mechanical behavior; Mechanics; Mechanics of materials; Natural polymers; Physicochemistry of polymers; Plastic deformation; Plasticized starch; Polymers; Starch and polysaccharides; Volumetric deformation; Mechanical behavior; Plasticized starch; Plastic deformation; Volumetric deformation; Stress strain relation; Glycerol; Long term variation; Experimental study; Mechanism; Tensile stress; Plasticizer; Concentration effect; Mannitol; Oside polymer; Wheat starch; Elongation (mechanics); plasticized starch; mechanical behavior; plastic deformation; volumetric deformation
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2014.06.087

•Mechanical behavior of plasticized starch in function of the plasticizer amount.•Mechanical behavior of plasticized starch in function of the plasticizer type.•Mechanical behavior of plasticized starch in function of the physical aging.•Plasticization quality, phase separation and retrogradation of starch. The aim of this paper is to understand the influence of plasticizer and plasticizer amount on the mechanical and deformation behaviors of plasticized starch. Glycerol, sorbitol and mannitol have been used as plasticizers. After extrusion of the various samples, dynamic mechanical analyses and video-controlled tensile tests have been performed. It was found that the nature of plasticizer, its amount as well as the aging of the material has an impact on the involved deformation mechanism. The variations of volume deformation could be explained by an antiplasticization effect (low plasticizer amount), a phase-separation phenomenon (excess of plasticizer) and/or by the retrogradation of starch.