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Radiation grafting of acrylic acid and N ‐vinyl imidazole onto polyethylene films for lead‐ion removal: A two‐dimensional correlation infrared spectroscopy investigation
Author(s) -
Al Lafi Abdul G.,
Ajji Z.
Publication year - 2017
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.44781
Subject(s) - grafting , infrared spectroscopy , polyethylene , steric effects , acrylic acid , polymer chemistry , polymer , imidazole , spectroscopy , materials science , infrared , chemistry , organic chemistry , copolymer , physics , quantum mechanics , optics
Two‐dimensional infrared (IR) correlation spectroscopy was used to follow the γ‐radiation grafting of N ‐vinyl imidazole (VIm) and acrylic acid onto polyethylene films. Grafting was confirmed by the appearance of new characteristic IR bands at 1715, 1735, 1475, and 1405 cm −1 , which were assigned to carboxylic groups and the stretching vibrations of aromatic CN and CN bonds, respectively. The adsorption of lead ions by the grafted polymer increased with the degree of grafting, and it showed a tendency to be altered by both the chemical structure of the matrix polymer and the steric hindrance of Pb 2+ ions. The previous two factors decreased the basic chelating group activity, imposed steric constraints on the formation of complexes between the Pb 2+ and VIm groups, and controlled the coordination of Pb 2+ with the COO − groups. IR spectroscopy combined with two‐dimensional correlation spectroscopy provided a powerful tool for investigating the interactions between heavy metals and functional groups. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44781.