TY - JOUR
T1 - Influence of ionic plasticizers on the processing and viscosity of starch melts
AU - Decaen, Paul
AU - Rolland-Sabaté, Agnès
AU - Colomines, Gaël
AU - Guilois, Sophie
AU - Lourdin, Denis
AU - Della Valle, Guy
AU - Leroy, Eric
N1 - Funding Information:
We are grateful for the Financial support provided by the LIMPONAN project funded by the “Région de Pays de la Loire” Council .
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2020/2/15
Y1 - 2020/2/15
N2 - Maize starch was plasticized by glycerol, choline chloride ([Chol][Cl]) and ionic liquids (Choline acetate ([Chol][Ace]), 1-Ethyl-3-methylimidazolium Chloride ([EMIM][Cl]) and 1-Ethyl-3-methylimidazolium acetate ([EMIM][Ace]). Melt rheology at 120 °C was assessed with a twin-screw micro-compounder used for processing small quantities (8−10 g), and with a capillary rheometer with pre-shearing (Rheoplast). Qualitative agreement was found between shear viscosities obtained by both rheometry devices, showing the interest of the micro-compounder for screening of plasticizers’ influence. The lower shear viscosity values were obtained in presence of [EMIM][Ace] whereas [Chol][Cl] led to the largest ones. Rather than processing induced macromolecular degradation, the glass transition temperature depressing effect of the plasticizers was found to better explain viscosity differences. This underlines the strong influence of the nature of the plasticizers on starch melt rheology. Finally, results from extensional viscosity shows the specific influence of [EMIM][Ace], suggesting that this plasticizer could be particularly relevant for thermoplastic starch processing.
AB - Maize starch was plasticized by glycerol, choline chloride ([Chol][Cl]) and ionic liquids (Choline acetate ([Chol][Ace]), 1-Ethyl-3-methylimidazolium Chloride ([EMIM][Cl]) and 1-Ethyl-3-methylimidazolium acetate ([EMIM][Ace]). Melt rheology at 120 °C was assessed with a twin-screw micro-compounder used for processing small quantities (8−10 g), and with a capillary rheometer with pre-shearing (Rheoplast). Qualitative agreement was found between shear viscosities obtained by both rheometry devices, showing the interest of the micro-compounder for screening of plasticizers’ influence. The lower shear viscosity values were obtained in presence of [EMIM][Ace] whereas [Chol][Cl] led to the largest ones. Rather than processing induced macromolecular degradation, the glass transition temperature depressing effect of the plasticizers was found to better explain viscosity differences. This underlines the strong influence of the nature of the plasticizers on starch melt rheology. Finally, results from extensional viscosity shows the specific influence of [EMIM][Ace], suggesting that this plasticizer could be particularly relevant for thermoplastic starch processing.
KW - Extrusion
KW - Glass transition
KW - Macromolecular degradation
KW - Rheology
KW - Thermoplastic starch
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U2 - 10.1016/j.carbpol.2019.115591
DO - 10.1016/j.carbpol.2019.115591
M3 - Article
C2 - 31887855
AN - SCOPUS:85075817029
VL - 230
JO - Carbohydrate Polymers
JF - Carbohydrate Polymers
SN - 0144-8617
M1 - 115591
ER -