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Use of starch granules melting to control the properties of bio-flour filled polypropylene and poly(butylene succinate) composites: Mechanical properties

Tran T., Lee B.H., Yang H.S., Chotineeranat S., Sriroth K., Kim H.J.. 2011. Starch - Stärke, 63 (10) : p. 637-648.

The feasibility and industrial potential of using bio-flours from tropical crop residues, in particular starch containing bio-flours, for the manufacture of bio-composites was investigated. Polypropylene (PP) and poly(butylene succinate) (PBS) were compounded with bio-flours from pineapple skin (P) and from non-destarched (CS) and destarched (C) cassava root by twin-screw extrusion. In CS composites, two levels of starch granules melting were achieved by adjusting the extrusion temperature, enabling control of morphological and mechanical properties. The use of bio-flours reduced tensile strength by 26-48% and impact strength by 14-40% when the proportion of bio-flour was increased to 40% w/w, while flexural strength initially increased upon addition of bio-flours, before decreasing at higher loads. The use of compatibilizers, in particular maleic anhydride-polypropylene (MAPP) in PP composites with 30% bio-flour resulted in tensile strength similar to non-compatibilized composites with 10% bio-flour (34-35?MPa). MAPP also increased flexural strength to higher levels than pure PP, resulting in a stronger, but less flexible material. (Résumé d'auteur)

Mots-clés : légume racine; farine non céréalière; propriété technologique; extrusion; propriété mécanique; manioc; manihot esculenta; ananas comosus; polypropylène; polymère; amidon industriel; amidon; résidu de récolte; produit non alimentaire; thaïlande

Thématique : Traitement des produits agricoles non alimentaires; Traitement des déchets agricoles

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