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Iron chelating polypropylene films: Manipulating photoinitiated graft polymerization to tailor chelating activity
Author(s) -
Roman Maxine J.,
Tian Fang,
Decker Eric A.,
Goddard Julie M.
Publication year - 2014
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.39948
Subject(s) - chelation , acrylic acid , polymerization , polymer chemistry , photoinitiator , chemistry , metal , carboxylic acid , materials science , nuclear chemistry , organic chemistry , copolymer , monomer , polymer
Transition metals, especially iron, enhance the oxidative degradation of lipids. Nonmigratory metal chelating active packaging can inhibit lipid oxidation and meet consumer demand for ‘cleaner' labels. Recently, the development of iron chelating films prepared by photoinitiated graft polymerization of acrylic acid on polypropylene (PP‐ g ‐PAA) was reported. The objective of this study was to tailor the chelating activity of PP‐ g ‐PAA by manipulating graft conditions. Carboxylic acids graft density and PAA graft thickness increased with graft time and acrylic acid concentration, with carboxylic acids density of up to 143 ± 32 nmol cm −2 , PAA graft thickness of ∼6–18 μm, and ligand (carboxylic acid) to metal (Fe 2+ ) binding ratio of ∼4–5. Reducing photoinitiator graft density decreased this ratio to ∼2–2.5, suggesting that graft chain density influences chelating activity. This work demonstrates the ability to tailor chelating activity of PP‐ g ‐PAA with potential applications in active packaging, chelation therapy, and water purification. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39948.