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Twin-screw extrusion impact on natural fibre morphology and material properties in poly(lactic acid) based biocomposites

Gamon, Guillaume and Evon, Philippe and Rigal, Luc Twin-screw extrusion impact on natural fibre morphology and material properties in poly(lactic acid) based biocomposites. (2013) Industrial Crops and Products, 46. 173-185. ISSN 0926-6690

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Official URL: http://dx.doi.org/10.1016/j.indcrop.2013.01.026

Abstract

Natural fibres from miscanthus and bamboo were added to poly(lactic acid) by twin-screw extrusion. The influence of extruder screw speed and of total feeding rate was studied first on fibre morphology and then on mechanical and thermal properties of injected biocomposites. Increasing the screw speed from 100 to 300 rpm such as increasing the feeding rate in the same time up to 40 kg/h helped to preserve fibre length. Indeed, if shear rate was increased with higher screw speeds, residence time in the extruder and blend viscosity were reduced. However, such conditions doubled electrical energy spent by produced matter weight without significant effect on material properties. The comparison of four bamboo grades with various fibre sizes enlightened that fibre breakages were more consequent when longer fibres were added in the extruder. Longer fibres were beneficial for material mechanical properties by increasing flexural strength, while short fibres restrained material deformation under heat by promoting crystallinity and hindering more chain mobility.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at http://dx.doi.org/10.1016/j.indcrop.2013.01.026
HAL Id:hal-00790824
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
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Deposited By: Philippe EVON
Deposited On:21 Feb 2013 10:39

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