Using nanocrystalline cellulose(NCC) and surface acylated NCC were used as strengthening agents,a newpolylactic acid(PLA) based composite membranes were prepared which can be used as biodegradable food packaging materials.The performance of the composite membranes were tested to investigate the effects of acylation modification on the composite membranes.NCC do have reinforce barrier properties on PLA,but not so obviously because of its bad dispensionin PLA,the reunion of NCC also resulting in the reduction...