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Abstract
AbstractMaleated styrene–ethylene–butylene–styrene triblock copolymer (SEBS‐g‐MA)/polypropylene 20/80 and SEBS/PP 20/80 blends reinforced with 30 wt% short glass fibres (SGF) were prepared by extrusion and subsequent injection moulding. The impact strength and fracture toughness of the hybrid composites were measured with the instrumented Charpy drop‐weight impact test and essential work of fracture (EWF) method. Drop‐weight impact measurements showed that the SGF/SEBS/PP composite exhibits higher impact strength than the SGF/SEBS‐g‐MA/PP hybrid at low impact speeds. Fibre pull‐out was responsible for the improved impact energy of the SGF/SEBS/PP composite subject to low impact velocity. At high impact speeds, the impact energy of the SGF/SEBS‐g‐MA/PP hybrid was slightly higher than that of the SGF/SEBS/PP composite. This was attributed to localized plastic deformation occurring in the fibre–matrix interfacial region. However, the EWF method revealed that the toughness of the SGF/SEBS‐g‐MA/PP hybrid was lower than that of the SGF/SEBS/PP composite. The effect of maleic anhydride (MA) functional groups grafted to SEBS on the fracture behaviour of the SGF/SEBS/PP hybrid composite is discussed.© 2002 Society of Chemical Industry
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