Synthesis and properties of sulfonated poly(arylene ether)s containing azole groups

Abstract

Random and multiblock sulfonated poly(arylene ether sulfone)s (SPEs) containing various azole groups such as oxadiazole and triazole were synthesized and characterized for fuel cell application. Successful preparation of SPE membranes depended on the structure of azole groups, which affected solubility of precursors and the resulting SPEs. Although oxadiazole groups were incorporated into hydrophobic component, they were found to be hydrophilic to give higher proton conductivity. Introduction of oxadiazole groups into random SPE gave comparable proton conductivity to that of Nafion NRE at >60% relative humidity at 80 °C. Block copolymer structure further increased the proton diffusion coefficient without increasing ion exchange capacity. Hydrolytic and oxidative stability of the SPE membranes was affected by both hydrophilic and hydrophobic components. Oxadiazole groups gave negative impact on hydrolytic and mechanical stability to the SPE membranes. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011

The Synthesis of Poly(ethylene glycol) (PEG) Containing Polymers via Step-Growth Click Coupling Reaction for CO2Separation

“…The reason of enhanced thermal stability is the high amount of aromatic triazole units on the main chain of the polymer. Heteroaromatic rings such as triazole and oxadiazole are well‐known structures having high thermal stabilities . In the case of SGCC‐5, the thermal stability was similar to SGCC‐(1‐3) polymers according to the temperatures of 5%, 10%, and maximum weight losses.…”

“…Heteroaromatic rings such as triazole and oxadiazole are well-known structures having high thermal stabilities. [37][38][39] In the case of SGCC-5, the thermal stability was similar to SGCC-(1-3) polymers according to the temperatures of 5%, 10%, and maximum weight losses. However, it has much higher char yield compared to other polymers, which is one of the most important parameters of thermal stability.…”

Preparation and Characterization of Phosphoric Acid-doped Blend Membrane Composed of Sulfonated Poly(arylene ether sulfone) and Polybenzimidazole for Fuel Cell Application

“…All other chemicals were purchased from Kanto Chemical Co. (Tokyo, Japan) and were used as received. 3,3'-Disulfonate-4,4'-difluorodiphenyl sulfone (SFDPS) sodium salt was synthesized as reported previously [8,9]. Nafion 117 (Du Pont Co. Ltd, Tokyo, Japan) was used as the control membrane.…”

“…SPAES was synthesized by reference to previous papers [8,9]. A 50 mL three-neck round-bottomed flask was charged with SFDPS (1.430 g, 3.120 mmol), FPS (0.340 g, 1.337 mmol), BP (0.830 g, 4.457 mmol), and potassium carbonate (1.905 g, 13.78 mmol).…”

“…On the other hand, aromatic hydrocarbon polymer electrolyte membranes have also been actively developed as alternatives for the conventional PFSA membranes. These aromatic hydrocarbon polymers including sulfonated polyimide (SPIs) [5][6][7], sulfonated poly(arylene ether sulfone)s (SPAESs) [8,9], and sulfonated polyphenylenes (SPPs) [10] have advantages in their low environmental load and low production cost as well as their high thermal and mechanical stabilities. However, these membranes often lead the drastical proton conductivity drop under low humidity or dry conditions due to desorption of water from the membranes.previous study, we revealed that the PA-SPI/PBI membrane provided a new proton transport pathway between phosphoric acid and sulfonic acid groups in addition to the conventional proton hopping among phosphoric acid groups at low humidity [11,12].…”