Macroscopic analysis of interfacial properties of flax/PLLA biocomposites |
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Authors: | Antoine Le Duigou Peter Davies Christophe Baley |
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Affiliation: | 1. LIMATB (Laboratoire d’Ingénierie des Matériaux de Bretagne), Université de Bretagne Sud, F – 56321 Lorient CEDEX, France;2. IFREMER, Brest Centre, Materials and Structures Group, F – 29280 Plouzané CEDEX, France |
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Abstract: | This study presents results from a study of the mechanical behaviour of flax reinforced Poly(l-Lactic Acid) (PLLA) under in-plane shear and mode I interlaminar fracture testing. Slow cooling of the unreinforced polymer has been shown to develop crystalline structure, causing improvement in matrix strength and modulus but a drop in toughness. The in-plane shear properties of the composite also drop for the slowest cooling rate, the best combination of in-plane shear performance and delamination resistance is noted for an intermediate cooling rate, (15.5 °C/min). The values of GIc obtained at this cooling rate are higher than those for equivalent glass/polyester composites. These macro-scale results have been correlated with microdroplet interface debonding and matrix characterization measurements from a previous study. The composite performance is dominated by the matrix rather than the interface. |
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Keywords: | A. Fibres A. Polymer matrix composites (PMCs) B. Interface B. Interfacial strength B. Delamination |
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