Novel cork-polymer composites reinforced with short natural coconut fibres : effect of fibre loading and coupling agent addition

摘要

Composites from high density polyethylene filled with cork powder and coconut short fibres, in two differentratios, were prepared in a twin-screw extruder followed by compression moulding process. Themain motivation of this work was to improve the mechanical performance without compromising theuse of high weight percentage of natural component used in the preparation of cork-based composites.The morphology of the hybrid composites were more homogeneous in the presence of the coupling agent(CA) displaying enhanced fibre–matrix adhesion. Moreover, the use of CA based on maleic anhydride promotesa mechanical reinforcement effect on the tensile properties, including the elongation at break. Theaddition of coconut fibre resulted on an increase of 27% in elastic modulus and 47% in the tensile strengthwhen compared with the unreinforced cork-based (50–50) wt.% composite. This work clearly shows thatthe addition of 10 wt.% of short-coconut fibres, randomly distributed, can be effectively used as reinforcingstrategy of cork-based composite materials, preferably in the presence of 2 wt.% of CA.