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UV Photo-Oxidation of Polybenzimidazole (PBI)

1
Plasma Laboratory, School of Chemistry and Materials Science, Rochester Institute of Technology, Rochester, NY 14623, USA
2
Xerox Analytical Services, Xerox Corporation, Webster, NY 14580, USA
3
Department of Mechanical Engineering, Rochester Institute of Technology, Rochester, NY 14623, USA
*
Author to whom correspondence should be addressed.
Technologies 2020, 8(4), 52; https://doi.org/10.3390/technologies8040052
Received: 1 September 2020 / Revised: 5 October 2020 / Accepted: 7 October 2020 / Published: 9 October 2020
(This article belongs to the Section Innovations in Materials Processing)
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. View Full-Text
Keywords: polybenzimidazole (PBI); UV photo-oxidation; UV-Vis photoabsorption spectrum of PBI; surface modification polybenzimidazole (PBI); UV photo-oxidation; UV-Vis photoabsorption spectrum of PBI; surface modification
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MDPI and ACS Style

Shedden, D.; Atkinson, K.M.; Cisse, I.; Lutondo, S.; Roundtree, T.; Teixeira, M.; Shertok, J.; Mehan, M.; Thompson, G.K.; Gupta, S.K.; Takacs, G.A. UV Photo-Oxidation of Polybenzimidazole (PBI). Technologies 2020, 8, 52. https://0-doi-org.brum.beds.ac.uk/10.3390/technologies8040052

AMA Style

Shedden D, Atkinson KM, Cisse I, Lutondo S, Roundtree T, Teixeira M, Shertok J, Mehan M, Thompson GK, Gupta SK, Takacs GA. UV Photo-Oxidation of Polybenzimidazole (PBI). Technologies. 2020; 8(4):52. https://0-doi-org.brum.beds.ac.uk/10.3390/technologies8040052

Chicago/Turabian Style

Shedden, Devon, Kristen M. Atkinson, Ibrahim Cisse, Shin Lutondo, Tyshawn Roundtree, Michilena Teixeira, Joel Shertok, Michael Mehan, Gregory K. Thompson, Surendra K. Gupta, and Gerald A. Takacs 2020. "UV Photo-Oxidation of Polybenzimidazole (PBI)" Technologies 8, no. 4: 52. https://0-doi-org.brum.beds.ac.uk/10.3390/technologies8040052

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