The wider practical application of biodegradable polymers has been restricted because of their disadvantages

such as high cost

slow crystallization

slow degradation rate

poor mechanical properties

and thermal instability. The fabrication of biodegradable polymer nanocomposites is one of the most effective methods to modify biodegradable polymers. Based on the recent studies on the modification of biodegradable polymers in our lab

this review summarizes the recent progress of poly(L-lactic acid) (PLLA) and poly (ε-caprolactone) (PCL) based nanocomposites by incorporating polyhedral oligomeric silsesquioxanes (POSS) with different functional groups as nanofillers. It has been found that POSS can enhance the crystallization and hydrolytic degradation processes and improve the mechanical properties of both PLLA and PCL effectively.