Abstract
ABSTRACTTwo‐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 Pb2+ ions. The previous two factors decreased the basic chelating group activity, imposed steric constraints on the formation of complexes between the Pb2+ and VIm groups, and controlled the coordination of Pb2+ 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.
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