Thermoplastic processing of protein-based bioplastics : chemical engineering aspects of mixing, extrusion and hot molding
2003
Pommet, Marion | Redl, Andreas | Morel, Marie Helene, M. H. | Domenek, Sandra | Guilbert, Stephane | Unité de Technologie des céréales et des agropolymères (MONTP UTCA) ; Institut National de la Recherche Agronomique (INRA) | Amylum Europe N.V. ; Partenaires INRAE
Times Cited: 19 7th World Conference on Biodegradable Polymer and Plastics JUN 04-08, 2002 PISA, ITALY
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Show more [+] Less [-]English. Proteins, as heteropolymers, offer a large range of possible interactions and chemical reactions. The thermoplastic behavior of proteins has been studied in order to produce bioplastics by thermal or thermornechanical processes such as mixing, extrusion or hot molding. The extrusion trials were performed by using a co-rotating twin-screw extruder, recording torque, temperature and die pressure. Batch mixing was done in a two blade counter-rotating mixer, with continuous recording of torque and product temperature. Proteins were alternatively extruded, mixed or hot molded under a large range of processing conditions. Protein aggregation during each process was estimated from the accumulation of SDS-insoluble protein fraction. Protein aggregation evidences a cross-linking reaction the activation energy of which was dependent on the thermoplastic process used. The increase in network density appears to be induced by the severity of the treatment: temperature and shear strongly affect the structural characteristics of the protein-based bioplastics.
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