From polybenzimidazoles to polybenzimidazoliums and polybenzimidazolides

Abstract

<p>New and emerging technologies for electrochemical energy conversion processes and challenging separations have been major drivers for the tremendous development of new polybenzimidazole chemistries and materials in recent years.</p>

Performance and stability comparison of Aemion™ and Aemion+™ membranes for vanadium redox flow batteries

“…Several authors reported the use of either acid doped polybenzimidazole (PBI) or modied versions of PBI, which have shown excellent selectivity, low self-discharge and thus high coulombic efficiency values up to nearly 100%. [16][17][18][19] A remaining challenge is the stability of current AEMs in the challenging environment of high concentrations of sulfuric acid as well as the highly oxidative VO 2 + species. Recently several groups have made tremendous efforts to improve the performance and stability of ionomers through methods such as crosslinking 18,20,21 and ionomer blending.…”

Preparation of High Strength and Toughness Aramid Fiber by Introducing Flexible Asymmetric Monomer to Construct Misplaced‐Nunchaku Structure

“…In addition, the design of hydrogen bonding to improve tensile strength of materials has received extensive attention in recent years. [ 17–19 ] 2‐(4‐aminophenyl)‐5‐aminobenzimidazole (PABZ), a diamine with benzimidazole ring, was introduced into PPTA as a monomer by Russian researchers. [ 20 ] The abundant hydrogen bonding sites on the benzimidazole ring greatly enhance the hydrogen bonding interaction in the aramid fiber and increase the tensile strength of PPTA by 20%.…”

Preparation of Large Conjugated Polybenzimidazole Fluorescent Materials and Their Application in Metal Ion Detection

“…According to the literature [ 33 , 34 , 35 ], 20 mL polyphosphoric acid (PPA) and 3,3′-diaminobenzidine 1 were added into a 50 mL flask and heated at 160 °C for 2 h. After they were completely dissolved, 3.0 mmol trans -butenedioic acid ( E -BA) 2 was added, and the mixture was heated to 170 °C for 48 h. After cooling to room temperature, the pH was adjusted to alkaline with NaOH solution, and then a blue–black solid was obtained by the filtration.…”