Dynamic and capillary shear rheology of natural fiber-reinforced composites

Abstract : An extended dynamic and capillary rheological study of molten flax and sisal polypropylene (PP) composites was performed. Fiber concentration varied from 20 to 50 wt% and shear rate from 0.1 rad s-1 to 10,000 sŽ-1. Maleic anhydride-grafted-PP was used as compatibilizer; it strongly reduces PP and composite viscosity. Composites are yield-stress shear-thinning fluids with solid-like behavior being more pronounced at high fiber content. Composites do not obey Cox-Merz rule, which was explained by different macrostructures of the molten composites in parallel plates and capillary die geometries: random fiber orientation versus strong alignment in the flow direction, respectively. Theories describing the viscosity of suspensions of solid particles were applied to the composites studied and rheological parameters and maximal packing fiber volume fraction were calculated.
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Contributeur : Magalie Prudon <>
Soumis le : jeudi 14 mars 2013 - 15:25:54
Dernière modification le : lundi 25 novembre 2019 - 14:42:06

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Nicolas Le Moigne, Martien van den Oever, Tatiana Budtova. Dynamic and capillary shear rheology of natural fiber-reinforced composites. Polymer Engineering and Science, Wiley-Blackwell, 2013, 53 (12), pp.2582-2593. ⟨10.1002/pen.23521⟩. ⟨hal-00800842⟩



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