Novel aromatic proton-exchange polyelectrolytes via polyacylation of pre-sulfonated monomers

Zhang, Zhenghui; Wu, Liang; Xu, Tongwen

doi:10.1039/c2jm31660a

Cited by 38 publications

(39 citation statements)

References 22 publications

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“…[14] The latter group demonstrated that post-functionalized sPPPs afford tough membranes possessing considerable electrochemical properties, and the group has made significant contributionst owards total polymerm orphological characterization. [15,53,54] Recently,o ur group reported the synthesis of ap refunctionalized,t etrasulfonated oligophenylene monomer based on the originalb is-tetracyclone( BTC), [55] which was used to preparea series of functionalized sPPP homopolymers and oligomers with ap recisely defined molecular structure. [16,[49][50][51] Unfortunately,d espite promising initial reports,a ccording to the published literature the overall synthetic strategy had several limitations.F irst, polymerization of the PPP backbone yielded aw ide range of molecular weights (M w = 12 300-172 000 Da) with dispersities ()r anging from 1.9-4.0.…”

Section: Introductionmentioning

confidence: 99%

Sulfophenylated Terphenylene Copolymer Membranes and Ionomers

et al. 2018

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The copolymerization of a prefunctionalized, tetrasulfonated oligophenylene monomer was investigated. The corresponding physical and electrochemical properties of the polymers were tuned by varying the ratio of hydrophobic to hydrophilic units within the polymers. Membranes prepared from these polymers possessed ion exchange capacities ranging from 1.86 to 3.50 meq g−1 and exhibited proton conductivities of up to 338 mS cm−1 (80 °C, 95 % relative humidity). Small‐angle X‐ray scattering and small‐angle neutron scattering were used to elucidate the effect of the monomer ratios on the polymer morphology. The utility of these materials as low gas crossover, highly conductive membranes was demonstrated in fuel cell devices. Gas crossover currents through the membranes of as low as 4 % (0.16±0.03 mA cm−2) for a perfluorosulfonic acid reference membrane were demonstrated. As ionomers in the catalyst layer, the copolymers yielded highly active porous electrodes and overcame kinetic losses typically observed for hydrocarbon‐based catalyst layers. Fully hydrocarbon, nonfluorous, solid polymer electrolyte fuel cells are demonstrated with peak power densities of 770 mW cm−2 with oxygen and 456 mW cm−2 with air.

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Section: Introductionmentioning

confidence: 99%

Sulfophenylated Terphenylene Copolymer Membranes and Ionomers

et al. 2018

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“…All these reagents were used as received unless otherwise stated. Eaton's reagent (P 2 O 5 /CH 3 SO 3 H mixture at a weight ratio of 1/10) and disodium SBP were prepared according to the literature …”

Section: Methodsmentioning

confidence: 99%

“…

W U = (W_{w e t} - W_{d r y}) / W_{d r y} \times 100 %

L S R = (L_{w e t} - L_{d r y}) / L_{d r y} \times 100 %

where W dry and L dry were the weight and length of dry membrane while W wet and L wet were those of wet membrane. Ionic conductivity of membranes was measured using a standard four‐electrode AC impedance technique on a PGSTAT302N autolab (Metrohm China) as described in previous report . The impedance was determined using galvanostatic mode with AC current amplitude of 0.1 mA over a frequency range from 10 6 to 50 Hz.…”

Section: Methodsmentioning

confidence: 99%

“…Perfluorosulfonated polymers such as Nafion® as standard commercial PEMs, however, have some inherent drawbacks such as high methanol permeability and high cost, thus intriguing great efforts on alternative polymers . Owing to high chemical and thermal stability, low methanol permeability, and inexpensive cost, sulfonated poly(ether ketone)s (SPEKs) have been extensively investigated as base materials for PEMs . Early SPEKs were mainly prepared by postsulfonation on electron‐rich arenes of poly(ether ketone)s, which suffered from poor control of sulfonation and side reactions such as crosslinking or even degradation .…”

Section: Introductionmentioning

confidence: 99%

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Poly(ether ketone)s bearing pendent sulfonate groups via copolyacylation of a sulfonated monomer and isomeric AB‐type comonomers

Zhang

2013

J. Polym. Sci. Part A: Polym. Chem.

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Poly(ether ketone)s bearing pendent sulfonate groups (SPEK‐x/y/z) have been successfully synthesized via copolyacylation of a presulfonated monomer SBP and two isomeric AB‐type self‐condensable comonomers, that is, 4‐phenoxybenzoic acid (p‐POBA) and 3‐phenoxybenzoic acid (m‐POBA). Proton‐exchange membranes (PEMs) with precisely controlled ion‐exchange capacity (IEC) and high strength can be readily prepared from these ionomers. PEMs prepared from p‐POBA other than m‐POBA exhibit much higher dimensional stability and proton conductivity at elevated temperature above 60 °C, showing prominent isomeric (para vs. meta) effects of polymer structural units. Furthermore, properties of PEMs prepared from p‐POBA are optimized by tuning IEC. SPEK‐1.0/2.2/0 with an IEC of 1.84 mmol g−1 exhibits acceptable swelling, much higher proton conductivity, and lower methanol permeability than commercial Nafion 115, implying potential application in direct methanol fuel cells. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 200–207

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“…4. All the membranes exhibit a certain amount of weight loss (o10% of the total) below 100 1C, which is attributed to the loss of absorbed water [27]. Compared with EQPPO-SiO 2 , the second starting decomposition temperature of H-EQPPO-SiO 2 (194 1C), which ascribes to the degradation of quaternary ammonium groups [23], is higher than that of EQPPOSiO 2 for more regular dense morphology.…”

Section: Thermal Stabilitiesmentioning

confidence: 96%

Novel aromatic proton-exchange polyelectrolytes via polyacylation of pre-sulfonated monomers

Cited by 38 publications

References 22 publications

Sulfophenylated Terphenylene Copolymer Membranes and Ionomers

Sulfophenylated Terphenylene Copolymer Membranes and Ionomers

Poly(ether ketone)s bearing pendent sulfonate groups via copolyacylation of a sulfonated monomer and isomeric AB‐type comonomers

Anion exchange membranes from hot-pressed electrospun QPPO–SiO2 hybrid nanofibers for acid recovery

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