Abstract
AbstractFour biofiber materials were compared against wood flour for their ability to act as reinforcing fillers in melt‐blended composites with polypropylene as the matrix polymer. The four materials were a waste wood composite (mixture of plywood, particleboard, and fiberboard), kenaf core, a waste jute–polyester composite panel, and waste newspaper. The composites were prepared either by extrusion or by blending in a high intensity thermokinetic mixer (K‐mixer), and mechanical properties were determined on injection molded specimens. Although some property differences were observed compared to wood flour/polypropylene composites, it appeared that any of the four materials might substitute for wood flour if local supply and cost circumstances offered advantages. However, waste newspaper clearly provided the best balance of mechanical properties relative to the other three test materials or wood flour. Relative to wood flour, waste newspaper filler increased unnotched impact by over 30 percent and flexure and tensile strengths by about 25 percent.
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