Scientists from Korea performed an experiment to fabricate castor oil/PCL based bio-polyurethane foam reinforced with nano cellulose. PU foam based on biomaterials 
was investigated to replace traditional petroleum-based polyol. Polyols were synthesized from castor oil (CO) and polycaprolactone (PCL). In addition, the effects of the nanocellulose on the thermal and mechanical properties of CO-based PU foam were investigated.
Results showed that addition of the nanocellulose could be an effective way to improve the mechanical and thermal properties of PU foams.