Hybrid composites based on polyethylene and coir/oil palm fibers

In this work, hybrid composites were produced by blending oil palm fibers with coir fibers and high-density polyethylene for fixed fiber content (40wt%). The composites were manufactured by twin-screw extrusion followed by compression molding. In particular, the effect of coupling agent (maleated polyethylene) concentration (0, 2, and 4wt%) was investigated. From the composites obtained, the morphological, structural, and thermal properties were evaluated via scanning electron microscopy, Fourier transformed-infrared spectrometry, and thermogravimetric analysis. The effect of fiber ratio and compatibilization on mechanical performances was studied in tension, flexion, torsion, and impact. The results showed that the compatibilized composites have better fiber dispersion/distribution (homogeneity) due to chemical bonding leading to good interfacial adhesion. All the mechanical properties increased with the presence of fibers and compatibilizer, with non-hybrid composites of coir and oil palm fibers exhibiting the highest and lowest moduli, respectively.