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Leroy E.,Laboratoire Of Genie Des Procedes Environnement Agroalimentaire | Jacquet P.,Laboratoire Of Genie Des Procedes Environnement Agroalimentaire | Coativy G.,Laboratoire Of Genie Des Procedes Environnement Agroalimentaire | Coativy G.,French National Institute for Agricultural Research | And 2 more authors.
Carbohydrate Polymers | Year: 2012

An ionic liquid (1-butyl-3-methyl imidazolium chloride [BMIM]Cl) was used as a plasticizer in starch, zein and their blends; and compared to glycerol, a classical plasticizer of starch. Thermoplastic plasticized biopolymer materials were obtained by melt processing using a twin screw microcompounder. Such a device allows simulating a twin screw extrusion process on small batches of a few grams, and to evaluate the necessary specific mechanical energy input for native starch destructurization; and the final apparent melt viscosity. Both were shown to be significantly reduced for starch in presence of [BMIM]Cl (compared to glycerol), while zein processing behavior was less sensitive to the plasticizer used. This induces significant starch/zein viscosity ratio differences, which affect melt mixing of the starch zein blends. In starch rich blends, this results in smaller zein aggregates in the case of [BMIM]Cl. The characterization of the materials indicates that, compared to glycerol, the use of [BMIM]Cl leads to less hygroscopicity, a more efficient plasticization of both starch and zein phases and a compatibilization of starch/zein blends. © 2012 Elsevier Ltd. All rights reserved.


Leroy E.,Laboratoire Of Genie Des Procedes Environnement Agroalimentaire | Decaen P.,Laboratoire Of Genie Des Procedes Environnement Agroalimentaire | Decaen P.,French National Institute for Agricultural Research | Jacquet P.,Laboratoire Of Genie Des Procedes Environnement Agroalimentaire | And 5 more authors.
Green Chemistry | Year: 2012

Deep eutectic solvents (DES) based on choline chloride and hydrogen bond donors are shown to be efficient functional additives for thermoplastic starch, able to act as efficient plasticizers, water uptake inhibitors, and as compatibilizers in the case of blends with a hydrophobic phase. One of the DES tested also prevents the recrystallization of starch. Although such properties can also be obtained with an imidazolium chloride ionic liquid, DES present the advantage of being environmentally friendly and potentially cheaper. Their wide potential in terms of formulation, by adjusting the nature and content of the hydrogen bond donor, opens new perspectives for the development of efficient starch based biodegradable plastics and composites. © 2012 The Royal Society of Chemistry.

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