Effect of Ultraviolet Irradiation on Performance of Propolis/Nano Silica Composite Film
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Abstract:
The effect of ultraviolet (UV) irradiation on the quality indexes-TS (tensile strength), E (elongation), T (transmittance), S (solubility), WVP (water vapor permeability), and OP (oxygen permeability)-of propolis/nano silica composite film was investigated. The TS and S values of the film increased to a maximum and subsequently declined, while E and OP values decreased gradually and then increased; T and WVP values decreased and bottomed out gradually upon irradiation. The TS value of the film treated with UV irradiation for 12 h improved by 3.07 MPa, and a UV treatment of 16 h resulted in an increase of 5.68 in the S value as compared to that of the untreated control. Additionally, decreases of 2.88%, 4.33%, 5.26%, 2.13 g/(cm·s·Pa) and 0.5 cm3/(m2·24 h·0.1 MPa) in the E, T, S, WVP, and OP values respectively, were observed. Multiple index analysis of the test results by principal component and cluster analysis simultaneously indicated that the composite film showed good overall performance when the irradiation time was 16 h, which was in line with the results of the single factor experiment. Therefore, the optimal processing time of propolis/nanosilica composite film could be confirmed by principal component and cluster analysis.
