Deformation mechanisms of plasticized starch materials

P. Mikus (1, 2, 3) , S. Alix (1, 2) , J. Soulestin (1, 2, 4) , M.F. Lacrampe (1, 2, 4) , P. Krawczak (2, 1, 4) , X. Coqueret (5) , P. Dole (3)

1 TPCIM - Département Technologie des Polymères et Composites & Ingénierie Mécanique
2 Mines Douai EMD - École des Mines de Douai
3 URCA - Université de Reims Champagne-Ardenne
4 IMT Lille Douai - Ecole nationale supérieure Mines-Télécom Lille Douai
5 ICMR - Institut de Chimie Moléculaire de Reims - UMR 7312

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.

Mots clés: plasticized starch; mechanical behavior; volumetric deformation; plastic deformation

Domaines: Polymères; Sciences de l'ingénieur [physics]; Mécanique des matériaux [physics.class-ph]; Matériaux

P. Mikus, S. Alix, J. Soulestin, M.F. Lacrampe, P. Krawczak, et al.. Deformation mechanisms of plasticized starch materials. Carbohydrate Polymers, 2014, 114, pp.450 - 457. ⟨10.1016/j.carbpol.2014.06.087⟩. ⟨hal-01773174⟩