Linear sulfonated polyimides containing polyhedral oligomeric silsesquioxane (POSS) in main chain for proton exchange membranes

Wu, Zhongying; Zhang, Shujiang; Li, Hui; Yu, Liang; Qi, Zhigang; Xu, Yixuan; Tang, Yiyao; Gong, Chenliang

doi:10.1016/j.jpowsour.2015.04.174

Cited by 55 publications

(25 citation statements)

References 70 publications

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“…Many efforts have been made to improve the thermal and mechanical properties of polyimides containing POSS [101,[119][120][121][122][123][124][125][126][127][128][129]. Wu et al [130] synthesized a novel polyimide with B-POSS in the main chains ( Figure 13). Different POSS content in the main chain was realized via a multi-step reaction methodology to obtain a series of linear semiaromatic sulfonated polyimides.…”

Section: Polyimide Possmentioning

confidence: 99%

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Progress in the Synthesis of Bifunctionalized Polyhedral Oligomeric Silsesquioxane

et al. 2019

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Polyhedral oligomeric silsesquioxane (POSS) has been considered as one of the most promising nanofillers in academic and industrial research due to its unique multifunctional nanostructure, easy functionalization, hybrid nature, and high processability. The progress of POSS has been extensive, particularly applications based on single- or multiple-armed POSS. In polymer hybrids, in order to enhance the properties, bifunctional POSS has been incorporated into the backbone chain of the polymer. This review summarizes recent developments in the synthesis, modification, and application of bifunctional POSS-containing composite materials. This includes amino-POSS, hydroxyl-POSS, aromatic ring-POSS, ether-POSS, and vinyl groups-POSS and their applications, exemplified by polyurethanes (PUs) and polyimides (PIs). In addition, the review highlights the enhancement of thermal, mechanical, and optical properties of the composites.

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Section: Polyimide Possmentioning

confidence: 99%

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confidence: 99%

Progress in the Synthesis of Bifunctionalized Polyhedral Oligomeric Silsesquioxane

et al. 2019

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“…Of the many alternative polymers available, we focus on silicone‐based polymers as potentially durable new materials for PEMs. In general, silicone‐based polymers have high chemical and heat resistance compared to conventional hydrocarbon polymers, making them potentially beneficial for use in PEMs 23,24 . In addition, silicone polymers are much cheaper than conventional fluorinated Nafion‐related ionomers.…”

Section: Introductionmentioning

confidence: 99%

Silicone‐containing polymer blend electrolyte membranes for fuel cell applications

Hwang

Kondō

Kikuchi

et al. 2020

J of Applied Polymer Sci

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Polymer electrolyte membranes are developed from blends of chemically durable silicone‐containing epoxy (Si‐Epoxy) and proton conducting sulfonic polyimide (SPI). A charge‐transfer (CT) complex is formed between electron‐donating dihydroxynaphthalene units in Si‐Epoxy, and electron‐accepting naphthalenediimide units in SPI, as confirmed via X‐ray diffraction and visible spectroscopy. The blend membranes show comparable mechanical strength to Nafion 211, but the elongation to break is much lower, indicating better resistance to deformation under strain stress, attributed to CT complex formation. The chemical durability of the blend membranes was much higher than pure SPI according to Fenton's test, also attributed to CT complex formation. Meanwhile, the proton conductivity is dependent on the sulfonic acid content of the SPI, which in turn affects the fuel cell performance. The maximum proton conductivity was measured to be 23.1 mS cm−1 at 80°C and 90 %RH for a 1:1 blend, and the membranes were successfully incorporated into PEFCs.

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“…However, high methanol permeability of Nafion makes it unsuitable for use in DMFCs and encourages the development of alternative proton conductive polymers. 11,12 Acid-functionalized aromatic hydrocarbon polymers, such as sulfonated poly(arylene sulfone)s, 13,14 sulfonated poly(arylene ketone)s, 15,16 sulfonated polyimides, 17,18 and sulfonated poly(benzimidazole)s, 19,20 have been investigated as substitutes for Nafion due to their high thermal, excellent mechanical property, high proton conductivity, and acceptable cost.…”

Section: Introductionmentioning

confidence: 99%

Chemically stable thioether cross-linked membranes derived from sulfonated poly(arylene ether ketone)s for direct methanol fuel cells

Yang

Wei

et al. 2017

High Performance Polymers

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A series of thioether cross-linked membranes based on sulfonated poly(arylene ether ketone)s containing propenyl groups were prepared to solve the problem of high methanol permeability for proton electrolyte membrane in direct methanol fuel cells (DMFCs). For this purpose, 4,4′-thiobisbenzenethiol was selected as cross-linker, and the cross-linked structure was formed via thiol-ene click chemical reaction between propenyl and thiol groups. Compared with pristine membrane, the thioether cross-linked membranes exhibited improved mechanical properties and dimensional stabilities. As the cross-linker increased, the swelling ratio decreased from 11.01% to 8.64% at 20°C and from 15.18% to 10.69% at 80°C. Furthermore, the modified membranes exhibited reduced methanol permeability coefficients (down to 4.03 × 10−7 cm2 s−1), which was nearly half of the pristine membrane (7.66 × 10−7 cm2 s−1). Due to the thioether units, the cross-linked membranes showed enhanced oxidative stabilities, and the longest elapsed time in Fenton’s reagent was 225 min, which was 2.5 times longer than that of pristine polymeric membrane. Although the proton conductivity decreased upon the addition of cross-linker agent, the selectivity value increased due to the lower methanol permeability. Thus, all the results implied that the thioether cross-linked membranes were promising alternative materials for DMFCs application.

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Linear sulfonated polyimides containing polyhedral oligomeric silsesquioxane (POSS) in main chain for proton exchange membranes

Cited by 55 publications

References 70 publications

Progress in the Synthesis of Bifunctionalized Polyhedral Oligomeric Silsesquioxane

Progress in the Synthesis of Bifunctionalized Polyhedral Oligomeric Silsesquioxane

Silicone‐containing polymer blend electrolyte membranes for fuel cell applications

Chemically stable thioether cross-linked membranes derived from sulfonated poly(arylene ether ketone)s for direct methanol fuel cells

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