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Formation of 2,4‐dinitrophenylhydrazones in high‐density polyethylene film irradiated with ultraviolet light
Author(s) -
Kato Koichiro
Publication year - 1975
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1975.070190404
Subject(s) - polyethylene , irradiation , low density polyethylene , materials science , ultraviolet , amorphous solid , high density polyethylene , contact angle , photochemistry , ultraviolet light , polymer chemistry , infrared , chemical engineering , chemistry , organic chemistry , composite material , optics , optoelectronics , physics , nuclear physics , engineering
Polyethylene 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 polyethylene films.