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This study evaluated reinforcing effect of waste lignocellulosic material (bagasse) and nano-SiO 2 powder on physical and mechanical properties of nano-biocomposites. In the specimen preparation, three levels of nanoSiO 2 (0, 2, and 5 wt%) and 40 wt% of fibers were used. In order to increase the interphase adhesion, polyethylene grafted with maleic anhydride was added as a coupling agent to all composites studied. The results showed that while tensile, flexural, and hardness properties were moderately improved by adding bagasse fibers and increasing nano-SiO 2 (NDS) content, Izod impact strength decreased dramatically, but fibers filled composite with 5 wt% nanoSiO 2 showed similar impact strength value to pure HDPE specimen. Natural fibers and increasing levels of nanoSiO 2 particles led to an upward trend for water absorption, while thickness swelling sharply increased and leveled off with adding these fillers. The results of study demonstrate positive effects of waste lignocellulosic material and nanoSiO 2 particles on physical and mechanical properties of composites.

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