Lignin nano-particles/sodium alginate composite film was prepared by casting method with aim of solving the problems of low mechanical properties and poor barrier properties of sodium alginate film.The effects of volume ratios of lignin nano-particles on the properties of composite film were discussed.The results showed that the thermal stability and ultraviolet absorbance of composite film was improved,whereas its equilibrium moisture content and water vapor permeability were significantly reduced with increasing the content of lignin nano-particles in the composite film.The water vapor permeability was only 1/3 of the controlling samples after 24 h.The barrier performance of the composite film to the ultraviolet and gas was improved after addition of lignin nano-particles,making it to be a potential candidate applied in the fields of agricultural products preservation such as fruits and vegetables.
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