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FTIR spectra of untreated poly(ethylene) film (thick line) and polyethylene film impregnated with wlanut husk extract (thin line). The spectrum for the impregnated film is offset by 10%. Polyethylene peaks are highlighted. The walnut husk‐impregnated film was produced using supercritical carbon dioxide with an ethanol modifier and a walnut husk to ethanol mass ratio of 1.00
