In this study, we present a facile approach for the development of a non-migratory antioxidant film via photografting of a conducing polymer (p-anisidine (PA)) onto polypropylene (PP). Initially, the surface of the PP film was functionalized via UV grafting (365 nm) of glycidyl methacrylate (GMA) in the presence of benzophenone (BP) into the methanol or mixed solvents (methanol and water). The addition of 40 v/v% of water into the coating solution led to an increase in grafting density, a reduction in UV-irradiation time, and changes in the grafting morphology. Scanning electron microscopy and atomic force microscopy were used in the identification of the breath figure array structure and brush-like grafting configuration on the surface of the films that were grafted in the mixed solvent (40 v/v % water). Subsequently, PA was immobilized onto the PP-g-GMA films via a ring-opening reaction wherein the PP-g-GMA films developed in the mixed solvent (40 % water) immobilized a higher amount of PA (2.114 ± 0.0013 μM), compared with those developed in methanol (1.760 ± 0.0070 μM). Fourier-transform infrared spectroscopy and solid state 13C nuclear magnetic resonance showed the chemical structure of the grafted surface and identified the grafting mechanism. Moreover, PP-g-GMA-g-PA films presented a strong free-radical scavenging activity using the DPPH assay. Furthermore, cyclic voltammetry analysis exhibited strong oxidation and reduction potential peaks, which proved the antioxidant activity of the films. Therefore, this newly developed free-radical scavenging film can be used as a non-migratory antioxidant film for a variety of applications, such as biomedical, cosmetic, and packaging.
Bibliographical noteFunding Information:
This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) [grant number 2020R1A2B5B01001797 ].
© 2020 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Surfaces, Coatings and Films
- Organic Chemistry
- Materials Chemistry