Olive stone flour from solid-waste was used as reinforcement polypropylene composite

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The usefulness of olive stone flour (OSF) from the solid residue of the olive oil extraction as a reinforcement for the preparation of a cost-effective polypropylene-based composite was investigated.

The lignocellulosic filler consisted of acicular particles with a broad size distribution ranging from about 50 to 400 μm, and is composed of lignin, hemicelluloses, and cellulose.

Composites with filler loading up to 70 wt% were prepared using a melt processing and injection molding.

The evolution of the mechanical performance, impact properties, and water absorbance of the composites as a function of the filler content were investigated.

The addition of a maleated polypropylene (MAPP) coupling agent at a level of 5%, with respect to the filler, was shown to be essential in bringing about a reinforcing effect.

A steady increase in the modulus along with a preservation in the tensile strength was observed up to a content of 60% OSF.

The obtained results have confirmed the viability of OSF as cheap reinforcing filler for the PP matrix; thus, opening new perspectives for the use of this agricultural by-product.

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