Abstract This article contributes to the understanding of biobased and biodegradable polyhydroxybutyrate (PHB) bionanocomposites melt processed by pre-industrial methods such as extrusion injection molding reinforced weight contents 1 3 wt% cellulose nanocrystals (CNC) derived from waste streams paper industry. Ultrasonic treatment was used for dispersion CNC, which followed transmission electr...