The main advantage of PHBs over other types of biodegradable polymers is it s biodegradability under both aerobic and anaerobic conditions,such as buried in soil, immersed in activated sludge, and submerged in sea water. It has been reported that PHB could be used as a nucleating agent for the PLA matrix. Tanese et al. demonstrated that the polymeric material based on PHB and cellulose fibers have good physical and mechanical characteristics, being suitable for packaging industry. Graupner and Mussig also reported that cellulose fiber-reinforced PLA and PHB composites have become increasingly interesting with regard to their biodegradability and mechanical characteristics . PHB is miscible
cellulose and it is expected to encapsulate the single cellulose nanofibers and prevent re-aggregation and formation of strong hydrogen bonds as the water is evaporated during melt compounding. For these reasons, a novel carrier system using PHB to create compatibility between the CNF suspension and a biodegradable PLA matrix and resulting composites are biodegradable materials and commonly investigated for food packaging applications .