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FTIR spectra of neat PE and PE containing different compounds at different photo-oxidation exposure time. (a) neat PE; (b) 2 wt.% Ca stearate; (c) 3 wt.% Ca stearate ;(d) 2 wt.% Vitamin E; (e) 3 wt.% Vitamin E; (f) 2 wt.% Ferulic Acid; (g) 3 wt.% Ferulic Acid.
