Hexyl quaternary ammonium- and fluorobenzoyl-grafted SEBS as hydrophilic–hydrophobic comb-type anion exchange membranes

Munsur, Abu Zafar Al; Lee, Junghwa; Chae, Ji Eon; Kim, Hyoung‐Juhn; Park, Chi Hoon; Nam, Sang Yong; Kim, Tae Hyun

doi:10.1016/j.memsci.2021.120029

Cited by 41 publications

(35 citation statements)

References 51 publications

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“…Although sc DQPPO AEMs show inferior mechanical properties to those of QPPO-40; once increasing IECs, the star cross-linked AEMs maintain high mechanical properties by limiting the swelling degree of the membranes. Compared with some reported AEMs, − the elongation at break is very small for the cross-linked AEMs (<25%); however, the mechanical properties of sc DQPPO-40 are sufficient for fuel cells application.…”

Section: Resultsmentioning

confidence: 79%

Poly(phenylene oxide)-Based Anion Exchange Membranes Having Linear Cross-Linkers or Star Cross-Linkers

Han

Zhang

Kang

et al. 2022

ACS Appl. Energy Mater.

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Linear cross-linked and star cross-linked anion exchange membranes (AEMs) are reported in this work, namely, lcQPPO (linear cross-linked quaternized poly(2,4-dimethyl-1,4-phenylene oxide) (PPO)) and scDQPPO (star cross-linked quaternized PPO) . Compared with original quarternized PPO (QPPO), cross-linked AEMs show a restrained swelling degree. But, due to the hindrance of a cross-linking polymer matrix, lcQPPO membranes show decreased ionic conductivity. For scDQPPO, its wide and connective ion channels are beneficial to the conduction of OH–, exhibiting increased ionic conductivity. Besides, the aggregated and cross-linked polymer networks in scDQPPO enhance the chemical stability and mechanical properties of the AEMs. Specifically, for scDQPPO-40, a high OH– conductivity of 100.7 mS cm–1 and a low swelling degree of 20.7% are achieved at 80 °C. The tensile strength and elongation at break of wet scDQPPO-40 at 25 °C are 16.7 MPa and 18.0%. After immersing in 1 M NaOH at 80 °C for 30 days, the loss of ionic conductivity and weight for scDQPPO-40 is 24.2 and 14.8%, with the degradation of tensile strength and elongation at break of 22.2% and 26.7%, respectively. On the basis of the membrane, a fuel cell performance of 0.577 W cm–2 is demonstrated at 60 °C, while, for QPPO-40 and lcQPPO-60, their fuel cell peak power densities are only 0.250 and 0.215 W cm–2.

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Section: Resultsmentioning

confidence: 79%

Poly(phenylene oxide)-Based Anion Exchange Membranes Having Linear Cross-Linkers or Star Cross-Linkers

Han

Zhang

Kang

et al. 2022

ACS Appl. Energy Mater.

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“…(b) Infrared spectra of SEBS-C16D60-DMHP- X ( X = 20–40%) membrane before and after natron. (c) Comparison of the alkali resistance of AEMs. ,− ,,,,, …”

Section: Resultsmentioning

confidence: 99%

“…literature. 9,[11][12][13]16,22,30,32,50 This is because the heteroatomfree structure of SEBS helps improve the alkali resistance of the membrane, and the introduction of N heteroalicyclic cations with larger steric hindrance can effectively reduce the attack of OH − ions. 51,52 Therefore, in general, the SEBS-C16D60-DMHP-40% membrane has better alkali resistance.…”

Section: Thermal Stability Of Polymeric Membranesmentioning

confidence: 99%

“…It was found that the ionic conductivity of the SEBS-C16D60-DMHP-40% membrane decreased by only 10.29% after soaking for 1400 h. At the same time, we compared the alkaline resistance of the AEM in this work with the data of previous work (Figure 8c) and found that the alkaline resistance of the SEBS-C16D60-DMHP-40% membrane was superior to the results that are reported in most literature. 9,[11][12][13]16,22,30,32,50 This is because the heteroatomfree structure of SEBS helps improve the alkali resistance of the membrane, and the introduction of N heteroalicyclic cations with larger steric hindrance can effectively reduce the attack of OH − ions. 51,52 Therefore, in general, the SEBS-C16D60-DMHP-40% membrane has better alkali resistance.…”

Section: Thermal Stability Of Polymeric Membranesmentioning

confidence: 99%

“…AEMs are mainly composed of a polymer backbone and cations . Common polymer frameworks are polyphenylene oxide (PPO), polysulfone (PSF), polybenzimidazole (PBI), polystyrene (PS), poly(styrene–ethylene/butene–styrene) (SEBS), and so on. − However, some studies have shown that due to working under alkaline conditions, the polymer backbone containing heteroatoms is easily attacked by OH – , resulting in extremely poor chemical stability, while the pure carbon chain polymer backbone without heteroatoms can enhance the alkaline resistance of AEMs very well. , Due to the special structure of alternating soft and hard and the characteristics of the full carbon chain skeleton, SEBS is very helpful to construct an obvious microphase separation structure and improve alkali stability and has shown a huge application potential in the research of AEMs.…”

Section: Introductionmentioning

confidence: 99%

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Anion Exchange Membranes Based on Styrene–Ethylene/Butene–Styrene Consist of Two Grafting Forms: N Heterocyclic Cations with Alkyl Intervals and Flexible Long Hydrophobic Side Chains

Wang

Zhang

Sang

et al. 2023

ACS Appl. Energy Mater.

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In view of the problems of poly(styrene–ethylene/butene–styrene) (SEBS) being difficult to dissolve and poor mechanical properties, a series of SEBS-C16D60-DMHP-X (X represents the cationic graft ratio, 20–40%) anion exchange membranes (AEMs) have been prepared. Graft hydrophobic long chains were applied onto the SEBS skeleton to change its solubility, introducing hydrophobic long chains to help construct microphase separation structures and improve ion conductivity (up to 110.22 mS cm–1). The combination of the rigid ring structure in the ring cation with an alkyl spacer and the toughness of the SEBS skeleton, as well as the free folding of alkyl chains, greatly improved the mechanical properties of the AEM, and the swelling ratio of the membrane is well controlled (25.31%, at 80 °C). The alkaline resistance (conductivity decreased only 10.29% after 1400 h of immersion at 80 °C in 2 M NaOH solution) also continuously increased. The structure of this AEM will provide a very meaningful reference for the development of AEMs.

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Polyolefin‐Based Anion Exchange Membranes with Superior Performance and Long‐Term Durability for Green Hydrogen Production

Roggi,

Guazzelli,

Agonigi

et al. 2023

Macro Chemistry & Physics

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In this work, a commercially available styrene‐butadiene block copolymer is functionalized with vinyl benzyl chloride (VBC) via solution free‐radical polymerization to obtain g‐VBC‐x graft copolymers. The molar content of VBC, also named functionalization degree (FD) or x, of g‐VBC‐x is varied in the range 10–27 mol%, simply by varying the concentration of VBC monomer in the feed or the reaction time. The g‐VBC‐x copolymers are used to prepare films by solution casting that are converted into anionic exchange membranes (AEMs) by heterogeneous quaternization reaction with trimethylamine (TMA). The membranes are extensively characterized to assess their thermal, mechanical, and ex‐situ electrochemical properties. The best performing AEMs having an FD of 20% and 27% are tested in an AEM single‐cell electrolyzer. Both of them are found to retain their original conductivity after more than 40 and 100 days, respectively. In particular, the membrane with the higher FD is characterized by the best in‐situ performance both in terms of ionic conductivity and cell potential.

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Hexyl quaternary ammonium- and fluorobenzoyl-grafted SEBS as hydrophilic–hydrophobic comb-type anion exchange membranes

Cited by 41 publications

References 51 publications

Poly(phenylene oxide)-Based Anion Exchange Membranes Having Linear Cross-Linkers or Star Cross-Linkers

Poly(phenylene oxide)-Based Anion Exchange Membranes Having Linear Cross-Linkers or Star Cross-Linkers

Anion Exchange Membranes Based on Styrene–Ethylene/Butene–Styrene Consist of Two Grafting Forms: N Heterocyclic Cations with Alkyl Intervals and Flexible Long Hydrophobic Side Chains

Polyolefin‐Based Anion Exchange Membranes with Superior Performance and Long‐Term Durability for Green Hydrogen Production

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