Antimicrobial food package
a technology of food package and antimicrobial agent, which is applied in the field of antimicrobial package, can solve the problems of reducing the quality of food, limiting the shelf life of food, and increasing the risk of food-borne illness to the consumer, and achieves the effect of prolonging the shelf life of packaged cometible items
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example 1
[0043]A polystyrene-b-poly(ethylene oxide) (PS-b-PEO) diblock copolymer was purchased from Polymer Source and used without further purification (number-average molecular weight, Mn, PS=42 kg mol−1, Mn, PEO=11.5 kg mol−1, Mgw / Mn=1.07, Mw: weight-average molecular weight). Microscopic glass substrates were cleaned by ultrasonication in ethanol and toluene for 30 min each and dried under a nitrogen stream. PS-b-PEO was dissolved in toluene to yield 0.9 wt % polymer solution at room temperature and this solution was aged for 12 hours.
[0044]The PS-b-PEO thin film was fabricated by spin coating the polymer solution at 3000 rpm for 30 sec on Si wafer. The film was exposed to toluene / water (50:50, v / v) mixed vapour placed at the bottom of a closed vessel kept at 50° C. for 1 h to induce mobility and allow microphase separation to occur. Separate reservoirs were used for each solvent to avoid azeotropic effects. The resultant phase separated film was immersed in ethanol at 40° C. for 15 h. F...
example 2
[0045]A polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) diblock copolymer was purchased from Polymer Source and used without further purification (number-average molecular weight, Mn, PS=24 kg mol−1, Mn, PEO=9.5 kg mol−1, Mw / Mn=1.06, Mw: weight-average molecular weight). A polymethylmethacrylate (PMMA) 400 micron thick film was cleaned by immersion in ethanol and ultrasonicated in the same solvent for 10 min. The film then dried under a nitrogen stream. PS-b-P4VP was dissolved in toluene to yield 0.5 wt % polymer solution at room temperature and was ultrasonicated for 10 min to ensure dispersion of the polymer. The PS-b-P4VP thin film was fabricated by spin coating the polymer solution at 3000 rpm for 30 sec on Si wafer. The film was exposed to toluene vapour placed at the bottom of a closed vessel kept at 50° C. for 2 h to induce chain mobility and allow microphase separation to occur. The film was immediately removed and placed in a similar arrangement so that the film was exposed...
example 3
[0046]The same PS-b-P4VP diblock copolymer described in example 2 was used here. A sheet (30 cm×30 cm) of aluminized polyvinylchloride food was cleaned by exposing to a UV / ozone mixture for 10 min. PS-b-P4VP was dissolved in toluene to yield 0.25 wt % polymer solution at room temperature and was ultrasonicated for 10 min to ensure dispersion of the polymer.
[0047]The PS-b-P4VP thin film was fabricated by dip coating the sheets into the polymer solution and removing when a knife edge was drawn across the film to remove excess solution. The sheet was exposed to toluene vapour by placing the sheet on a self-supporting gauze support 1 cm above the bottom of a tray containing toluene. The tray was covered and sealed with a steel lid. All solvent treatments were a room temperature for a period of 2 h. The sheet was removed and placed in a similar arrangement so that the film was exposed to ethanol vapour for 20 min. The sample was removed and placed into ethanol containing 0.25 weight perc...
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