AbstractPolyethylene films were irradiated in air by ultraviolet light. 2,4‐Dinitrophenylhydrazine was reacted on the irradiated films. The changes in amounts of carbonyl groups and 2,4‐dinitrophenynlhydrazones formed in the films were inferred by comparing their absorptions in the infrared and ultraviolet spectra, respectively. It seems that the contents of carbonyl groups formed in the amorphous regions in the high‐density polyethylene films by the irradiation were larger than the contents of carbonyl groups formed in the amorphous regions in the low‐density polyethylene films. The decreases in contact angles of water on the high‐density polyethylene films by the irradiation were larger than the decreases in the contact angles on the low‐density polyethylene films. The amounts of 2,4‐dinitrophenylhydrazones formed in the irradiated high‐density polyethylene films were less than the amounts of 2,4‐dinitrophenylhydrazones formed in the irradiated low‐density
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