Preparation and properties of propolis /nano-silica composite film

Technological parameters using gelatin as base material to make evenly spread propolis /nano- silica composite film were optimized with the right amount of propolis and nano-silica.The influence of the added amount of gelatin, propolis and nano-silica on tensile strength, elongation, transmittance, water vapor permeability, oxygen permeability and carbon dioxide permeability of the composite film, were firstly investigated by single factor experiments, and the data were then analyzed by the methd of principal component analysis.The results indicated that excellent comprehensive performance of the film was obtained by the formula that the added amount of gelatin, propolis and nano-silica were 2g /100 mL, 1.5g /100 mL and 0.03 g /100 mL, respectively.