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Open AccessArticle

Branched Sulfonimide-Based Proton Exchange Polymer Membranes from Poly(Phenylenebenzopheneone)s for Fuel Cell Applications

1
Department of Applied Chemistry, Konkuk University, Chungju 27478, Korea
2
Department of Liberal Art, Konkuk University, Chungju 27478, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Metin Uz
Membranes 2021, 11(3), 168; https://doi.org/10.3390/membranes11030168
Received: 1 February 2021 / Revised: 22 February 2021 / Accepted: 23 February 2021 / Published: 27 February 2021
(This article belongs to the Special Issue Electrically Conductive Membranes)
Improved proton conductivity and high durability are now a high concern for proton exchange membranes (PEMs). Therefore, highly proton conductive PEMs have been synthesized from branched sulfonimide-based poly(phenylenebenzophenone) (SI-branched PPBP) with excellent thermal and chemical stability. The branched polyphenylene-based carbon-carbon backbones of the SI-branched PPBP membranes were attained from the 1,4-dichloro-2,5-diphenylenebenzophenone (PBP) monomer using 1,3,5-trichlorobenzene as a branching agent (0.1%) via the Ni-Zn catalyzed C-C coupling reaction. The as-synthesized SI-branched PPBP membranes showed 1.00~1.86 meq./g ion exchange capacity (IEC) with unique dimensional stability. The sulfonimide groups of the SI-branched PPBP membranes had improved proton conductivity (75.9–121.88 mS/cm) compared to Nafion 117 (84.74 mS/cm). Oxidation stability by thermogravimetric analysis (TGA) and Fenton’s test study confirmed the significant properties of the SI-branched PPBP membranes. Additionally, a very distinct microphase separation between the hydrophobic and hydrophilic moieties was observed using atomic force microscopic (AFM) analysis. The properties of the synthesized SI-branched PPBP membranes demonstrate their viability as an alternative PEM material. View Full-Text
Keywords: proton exchange membrane; sulfonimide; nickel catalyzed polymerization; ion exchange capacity; dimensional stability; proton conductivity proton exchange membrane; sulfonimide; nickel catalyzed polymerization; ion exchange capacity; dimensional stability; proton conductivity
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MDPI and ACS Style

Sutradhar, S.C.; Yoon, S.; Ryu, T.; Jin, L.; Zhang, W.; Kim, W.; Jang, H. Branched Sulfonimide-Based Proton Exchange Polymer Membranes from Poly(Phenylenebenzopheneone)s for Fuel Cell Applications. Membranes 2021, 11, 168. https://doi.org/10.3390/membranes11030168

AMA Style

Sutradhar SC, Yoon S, Ryu T, Jin L, Zhang W, Kim W, Jang H. Branched Sulfonimide-Based Proton Exchange Polymer Membranes from Poly(Phenylenebenzopheneone)s for Fuel Cell Applications. Membranes. 2021; 11(3):168. https://doi.org/10.3390/membranes11030168

Chicago/Turabian Style

Sutradhar, Sabuj C.; Yoon, Sujin; Ryu, Taewook; Jin, Lei; Zhang, Wei; Kim, Whangi; Jang, Hohyoun. 2021. "Branched Sulfonimide-Based Proton Exchange Polymer Membranes from Poly(Phenylenebenzopheneone)s for Fuel Cell Applications" Membranes 11, no. 3: 168. https://doi.org/10.3390/membranes11030168

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