Effect of lubricant on mechanical and rheological properties of compatibilized PP/sawdust composites

► The concomitant use of lubricant and compatibilizer reduces mechanical properties. ► Studies on the action of lubricant and compatibilizer allow evaluation of optimal concentrations in composites. ► Compatibilizers act as lubricant in composites reinforced with natural fibers. ► Composites with high concentrations of natural fibers should contain lubricants.