Polybenzimidazole block sulfonated poly(arylene ether sulfone) ionomers

Ng, Feifei; Bae, Byungchan; Miyatake, Kenji; Watanabe, Masahiro

doi:10.1039/c1cc12266e

Cited by 24 publications

(26 citation statements)

References 22 publications

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“…There are a few other attempts to achieve nanostructural control, which were reported recently, including (multi)block copolymer synthesis and generally, a positive effect on the conductivity was found but no detailed structural information (e.g. domain size) was provided so far [10][11][12]. Inspired by recent attempts to use graft copolymers to induce microphase-separated structures for organic-electronics applications [13], we aim to synthesize poly[2,2!-(m-phenylene)-5,5!bibenzimidazole] (PBI) based graft-copolymers that can undergo microphase separation.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured poly(benzimidazole) membranes by N-alkylation

Dominguez

Grygiel

Weber

2014

Express Polym. Lett.

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Abstract. Modification of poly(benzimidazole) (PBI) by N-alkylation leads to polymers capable of undergoing microphase separation. Polymers with different amounts of C 18 alkyl chains have been prepared. The polymers were analyzed by spectroscopy, thermal analysis, electron microscopy and X-ray scattering. The impact of the amount of alkyl chains on the observed microphase separation was analyzed. Membranes prepared from the polymers do show microphase separation, as evidenced by scattering experiments. While no clear morphology could be derived for the domains in the native state, evidence for the formation of lamellar morphologies upon doping with phosphoric acid is provided. Finally, the proton conductivity of alkyl-modified PBI is compared with that of pure PBI, showing that the introduction of alkyl side chains does not result in significant conductivity changes.

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Section: Introductionmentioning

confidence: 99%

Nanostructured poly(benzimidazole) membranes by N-alkylation

Dominguez

Grygiel

Weber

2014

Express Polym. Lett.

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“…An efficient proton conductive material with high thermal stability was developed by Miyatake, Watanabe and coworkers utilizing multiblock (AB) n -type copolymers containing poly(arylene ether sulfone) block appending protogenic sulfonated group (A) and robust hydrophobic polybenzimidazole (PBI) block (B) in an alternating arrangement. 46 For efficient proton conduction, the formation of continuous ionic transporting pathways is required. The transporting pathways can likely be constructed by well-developed phase separation between the hydrophilic and hydrophobic blocks of the multiblock copolymer.…”

Section: Abc-type Multiblock Moleculesmentioning

confidence: 99%

Bioinspired multi-block molecules

Muraoka

2016

Chem. Commun.

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Multiblock motifs occur in proteins such as silk, elastin and ion channels. These motifs are advantageous to develop the characteristic mechanical properties through the formation of segregated intermolecular assemblies, and utilized to construct cylindrical channels in a membrane by folding and assembly with intra- or intermolecular interactions. As nature shows such elegant examples of multiblock molecules exerting sophisticated functions, synthetic multiblock molecules and copolymers have gained increasing attention as emerging structural motifs for realizing unique properties and functions. Recent notable examples of synthetic multiblock molecules and copolymers are highlighted, where linear molecules not only undergo folding elaborately but also form controlled and compartmentalized self-assemblies to realize characteristic functions in solution, the crystalline state, and membranous media.

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“…Many PBI variants containing a range of structural and functional moieties have been examined to further explore the effects of polymer structure on membrane properties . Among these, several copolymer systems have been evaluated to extensively investigate how their properties change with respect to composition . In this work, sequence isomerism in a unique copolymer system is evaluated.…”

Section: Introductionmentioning

confidence: 99%

Investigation of sequence isomer effects in AB-polybenzimidazole polymers

Gulledge

Chen

Benicewicz

2013

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

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In the present work, a unique series of random polybenzimidazole (PBI) copolymers consisting of the recently reported novel isomeric AB‐PBI (i‐AB‐PBI) and the well known AB‐PBI were synthesized. The i‐AB‐PBI incorporates additional linkages (2,2 and 5,5) in the benzimidazole sequence when compared with AB‐PBI. Random copolymers, varying in composition at 10 mol % increments, were synthesized to evaluate the effects of sequence isomerism in the polymer main chain without altering the fundamental chemical composition or functionality of a polymer chain consisting of 2,5‐benzimidazole units. Polymer solutions were prepared in polyphosphoric acid (PPA) and cast into membranes using the sol–gel PPA process. The resulting polymers were found to have high inherent viscosities (>2.0 dL/g) and showed elevated membrane proton conductivities (∼0.2 S/cm) under anhydrous conditions at 180 °C. Fuel cell performance evaluations were conducted, and an average output voltage ranging from 0.5 to 0.60 V at 0.2 A/cm2 was observed for hydrogen/air at an operational temperature of 180 °C without applied backpressure or humidification. Herein, we report for the first time glass transition (Tg) temperatures for AB‐PBI, i‐AB‐PBI, and an anomalous Tg effect for the series of randomized PBIs. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 619–628

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Polybenzimidazole block sulfonated poly(arylene ether sulfone) ionomers

Cited by 24 publications

References 22 publications

Nanostructured poly(benzimidazole) membranes by N-alkylation

Nanostructured poly(benzimidazole) membranes by N-alkylation

Bioinspired multi-block molecules

Investigation of sequence isomer effects in AB-polybenzimidazole polymers

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