Abstract
Active packaging materials with surface immobilized metal chelating ligands were prepared by laminated photografting technique. The resulting materials presented transition metal scavenging properties with potential application in non-migratory antioxidant active packaging materials. Photografting of functional polymer ligands is typically performed in an oxygen-free environment, requiring a nitrogen inerting step, which limits potential industrial scale-up. Laminated photografting eliminates the need for nitrogen inerting by sandwiching the monomer solution between base material and an oxygen barrier layer. In this study, we demonstrated the ability to synthesize metal chelating active packaging materials, previously prepared by standard batch photografting, using a laminated photografting technique. The polypropylene-graft-poly(acrylic acid) and polypropylene-graft-poly(hydroxamic acid) chelating films prepared by laminated photografting presented similar surface chemistry as those reported previously, as characterized by infrared spectroscopy, and presented ferric ion chelating capacity of 182 ± 29 and 89 ± 10 nmol/cm2, respectively, at pH 5.0. The reported laminated photografting represents a coating technology with potential for adaptation to roll-to-roll manufacture of metal chelating films on an industrial scale.
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Acknowledgments
This project was supported by Agriculture and Food Research Initiative Grant No. 2012-67017-30157 from the USDA National Institute of Food and Agriculture, Improved Processing Technologies (A1351). We also thank Maxine J. Roman in our research group for her input in this project.
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Lin, Z., Decker, E.A. & Goddard, J.M. Preparation of metal chelating active packaging materials by laminated photografting. J Coat Technol Res 13, 395–404 (2016). https://doi.org/10.1007/s11998-015-9767-z
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DOI: https://doi.org/10.1007/s11998-015-9767-z