A property trend study of polybenzimidazole using molecular modeling

Iwamoto, Nancy

doi:10.1002/pen.760340509

Cited by 11 publications

(9 citation statements)

References 1 publication

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“…PBI loses its compressive strength at increased water content, which could be due to weakened van der Waals forces and hydrogen bonding interactions as a consequence of polymer swelling. Iwamoto et al [104] investigated the relationship between the tensile strength of PBI as a function of water content. They found that 10% water absorption resulted in a 25–30% decrease in the tensile strength.…”

Section: Pbi-based Composite Membranesmentioning

confidence: 99%

Composite Membranes for High Temperature PEM Fuel Cells and Electrolysers: A Critical Review

et al. 2019

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Polymer electrolyte membrane (PEM) fuel cells and electrolysers offer efficient use and production of hydrogen for emission-free transport and sustainable energy systems. Perfluorosulfonic acid (PFSA) membranes like Nafion® and Aquivion® are the state-of-the-art PEMs, but there is a need to increase the operating temperature to improve mass transport, avoid catalyst poisoning and electrode flooding, increase efficiency, and reduce the cost and complexity of the system. However, PSFAs-based membranes exhibit lower mechanical and chemical stability, as well as proton conductivity at lower relative humidities and temperatures above 80 °C. One approach to sustain performance is to introduce inorganic fillers and improve water retention due to their hydrophilicity. Alternatively, polymers where protons are not conducted as hydrated H3O+ ions through liquid-like water channels as in the PSFAs, but as free protons (H+) via Brønsted acid sites on the polymer backbone, can be developed. Polybenzimidazole (PBI) and sulfonated polyetheretherketone (SPEEK) are such materials, but need considerable acid doping. Different composites are being investigated to solve some of the accompanying problems and reach sufficient conductivities. Herein, we critically discuss a few representative investigations of composite PEMs and evaluate their significance. Moreover, we present advances in introducing electronic conductivity in the polymer binder in the catalyst layers.

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Section: Pbi-based Composite Membranesmentioning

confidence: 99%

Composite Membranes for High Temperature PEM Fuel Cells and Electrolysers: A Critical Review

et al. 2019

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“…Although high water uptake improves proton conductivity, excessive absorbed water can deteriorate the membrane's mechanical strength, chemical stability, and dimensional stability due to the weakened hydrogen bonding interactions and Van der Waals forces caused by polymer swelling [35,87]. It has been reported that the tensile strength of the membrane decreases by about 25-30% with the addition of 10% water [88].…”

Section: Other Important Parametersmentioning

confidence: 99%

A Review of Recent Developments and Advanced Applications of High-Temperature Polymer Electrolyte Membranes for PEM Fuel Cells

et al. 2021

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This review summarizes the current status, operating principles, and recent advances in high-temperature polymer electrolyte membranes (HT-PEMs), with a particular focus on the recent developments, technical challenges, and commercial prospects of the HT-PEM fuel cells. A detailed review of the most recent research activities has been covered by this work, with a major focus on the state-of-the-art concepts describing the proton conductivity and degradation mechanisms of HT-PEMs. In addition, the fuel cell performance and the lifetime of HT-PEM fuel cells as a function of operating conditions have been discussed. In addition, the review highlights the important outcomes found in the recent literature about the HT-PEM fuel cell. The main objectives of this review paper are as follows: (1) the latest development of the HT-PEMs, primarily based on polybenzimidazole membranes and (2) the latest development of the fuel cell performance and the lifetime of the HT-PEMs.

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“…The water absorption of PBI is comparable to that of cotton (16%) and the absorbed water in PBI does not leave until the temperatures are well above 150 o . 2,4 Two possible molecular mechanisms are identified to be responsible for the high moisture absorption. The first is induced by two water molecules that are attached to each imidazole ring; the second is due to one water molecule that is attached to neighboring imidazole rings on adjacent polymer chains.…”

Section: Introductionmentioning

confidence: 99%

“…3 The absorbed moisture also influences the electrical insulation resistance and dielectric properties. 4 In addition, PBI can also be used as excellent thermal resistant coatings with a low friction surface for protection from mechanical abrasion, low coefficient of thermal expansion (similar to aluminum), high thermal and electrical insulation, and exceptional corrosion resistance to chemical attack in a wide range of substrate.…”

Section: Introductionmentioning

confidence: 99%

A comparative experimental study of the hygroscopic and mechanical behaviors of electrospun nanofiber membranes and solution‐cast films of polybenzimidazole

Жолобко

Zhou

et al. 2020

J of Applied Polymer Sci

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This article reports a comparative experimental study of the hygroscopic and mechanical behaviors of electrospun polybenzimidazole (PBI) nanofiber membranes and solution-cast PBI films. Aselectrospun nonwoven PBI nanofiber mats (with the nanofiber diameter of ~250 nm) were heat-pressed under controlled temperature, pressure and duration for the study; lab-made solution-cast PBI films and commercially available PBI films (the PBI Performance Product Inc., Charlotte, NC ) were used as the control samples. Thermogravimetric and micro-tensile tests were utilized to characterize the hygroscopic (moisture absorption) and mechanical properties of the PBI nanofiber membranes at varying heat-pressing conditions, which were further compared to those of solution-cast PBI films. Experimental results indicated that the PBI nanofiber membranes carried slightly higher thermal stability and less hygroscopic properties than those of solution-cast PBI films. In addition, heat-pressing conditions significantly influenced the mechanical properties of the resulting PBI nanofiber membranes. The stiffness and tensile strength increase with increasing either the heat-pressing pressure or duration, and relevant mechanisms were explored. The present study provides a rational understanding of the hygroscopic and mechanical behaviors of electrospun This article is protected by copyright. All rights reserved. This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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A property trend study of polybenzimidazole using molecular modeling

Cited by 11 publications

References 1 publication

Composite Membranes for High Temperature PEM Fuel Cells and Electrolysers: A Critical Review

Composite Membranes for High Temperature PEM Fuel Cells and Electrolysers: A Critical Review

A Review of Recent Developments and Advanced Applications of High-Temperature Polymer Electrolyte Membranes for PEM Fuel Cells

A comparative experimental study of the hygroscopic and mechanical behaviors of electrospun nanofiber membranes and solution‐cast films of polybenzimidazole

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