Study on structure film properties of polyvinylidene chloride modified by nano- Si O_2 and beeswax

In this study,in order to improve film- forming and water- blocking properties of PVDC,sodium dodecyl sulfate was used as surfactant to modify nano- Si O_2 so as to increase its aqueous stability and then modify PVDC together with beeswax.The result showed that the most nano- Si O_2 and beeswax concentration were 0.12 g /100 m L and 0.45 g /100 m L,respectively.Nano- Si O_2 and beeswax could decrease viscosity and coating transmittance of PVDC significantly( p < 0.05) and also could improve coating mechanical behavior of PVDC( p < 0.05).Nano- Si O_2 and beeswax could fill in PVDC molecule gap and make the film smooth with the result of scanning electron microscopy.Therefore,nano- Si O_2 and beeswax could improve coating mechanical,barrier properties of PVDC and then applied to food preservation.