It was proposed that due to the formation of fibril network within the matrix, there was effective increment in tensile strength, and Young’s modulus, especially at higher concentrations of CNF. The addition of CNF was also effective to improve water vapor barrier of the films (2.66 to 1.67 g.mm/kPa.h.m2). The water vapor permeability was significantlydecreasedwhenCNFwasincorporatedatloadingsofatleast 10%(10g/100g).