Shedden, Devon and Atkinson, Kristen M. and Cisse, Ibrahim and Lutondo, Shin and Roundtree, Tyshawn and Teixeira, Michilena and Shertok, Joel and Mehan, Michael and Thompson, Gregory K. and Gupta, Surendra K. and Takacs, Gerald A. (2020) UV Photo-Oxidation of Polybenzimidazole (PBI). Technologies, 8 (4). p. 52. ISSN 2227-7080
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Abstract
Since polybenzimidazole (PBI) is often used in the aerospace industry, high-temperature fuel cells, and in redox flow batteries, this research investigated the surface modification of PBI film with 253.7 and 184.9 nm UV photo-oxidation. As observed by X-ray photoelectron spectroscopy (XPS), the oxygen concentration on the surface increased up to a saturation level of 20.2 ± 0.7 at %. With increasing treatment time, there were significant decreases in the concentrations of C-C sp2 and C=N groups and increases in the concentrations of C=O, O-C=O, O-(C=O)-O, C-N, and N-C=O containing moieties due to 253.7 nm photo-oxidation of the aromatic groups of PBI and reaction with ozone produced by 184. 9 nm photo-dissociation of oxygen. Because no significant changes in surface topography were detected by Atomic Force Microscopy (AFM) and SEM measurements, the observed decrease in the water contact angle down to ca. 44°, i.e., increase in hydrophilic, was due to the chemical changes on the surface.
Item Type: | Article |
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Subjects: | West Bengal Archive > Multidisciplinary |
Depositing User: | Unnamed user with email support@westbengalarchive.com |
Date Deposited: | 10 Apr 2023 06:39 |
Last Modified: | 12 Aug 2024 11:48 |
URI: | http://article.stmacademicwriting.com/id/eprint/475 |