Enhanced ion conductivity of sulfonated poly(arylene ether sulfone) block copolymers linked by aliphatic chains constructing wide-range ion cluster for proton conducting electrolytes

Lee, Kyu Ha; Chu, Ji Young; Vinothkannan, Mohanraj; Kim, Ae Rhan; Song, Min Ho; Yoo, Dong Jin

doi:10.1016/j.ijhydene.2020.07.197

Cited by 70 publications

(34 citation statements)

References 58 publications

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“…These high hydration numbers would facilitate the water transmission through the membrane for CPC application enhancing its breathability. However, these λ's would be too elevated for fuel cell applications since it could retard the movement of the protons in the membrane, some recommended values reported are around 12, 45 which are significantly lower than those obtained for SIBS‐PIL's membranes.…”

Section: Resultsmentioning

confidence: 88%

Sulfonated poly(styrene‐isobutylene‐styrene) grafted with hexyl‐ and butyl‐imidazolium chloride ionic liquids

Barrios‐Tarazona

Suleiman

2021

Journal of Polymer Science

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In this work, novel sulfonated poly(ionic liquid)s block-copolymers based on poly(styrene-isobutylene-styrene) (SIBS) are synthesized for chemical protective clothing (CPC) applications. The synthesis consists of the chloromethylation of SIBS, followed by the incorporation of N-alkylimidazole through chemical grafting, and concluding with sulfonation of the resulting compound. Properties of the membranes are determined as a function of different N-alkylimidazoles (butylimidazole and hexylimidazole) and sulfonation levels (7-23 mol%). Results show that the incorporation of imidazole and sulfonic groups increases the thermal stability of SIBS as well as its water absorption capabilities. The interaction between the ionic moieties in the polymeric matrix allows the formation of hydrophilic nanochannels, which promote the transport of permeants through the membrane. The high water vapor transmission rate (above 2000 g m À2 day À1 ) and values of selectivity (~50) demonstrate that the breathability of the synthesized membrane is improved while blocking the passage of dimethyl methylphosphonate (simulant of agent Sarin). The above mentioned observations suggest that sulfonated SIBS-PIL's membranes are potential materials for CPC applications.

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Section: Resultsmentioning

confidence: 88%

Sulfonated poly(styrene‐isobutylene‐styrene) grafted with hexyl‐ and butyl‐imidazolium chloride ionic liquids

Barrios‐Tarazona

Suleiman

2021

Journal of Polymer Science

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“…the Fenton's test is widely accepted to evaluate the oxidation stability of proton exchange membranes. [22] In Figure 3, which shows the oxidation stability of HBP-b-xBPSBP and c-HBP-b-0.5BPSBP during the Fenton's test at 25 °C, all the membranes show good oxidation stability with residual weight above 95%. The c-HBP-b-0.5BPSBP possesses the highest oxidation stability with 99.2% residual mass, HBP-b-0.7BPSBP with 98.7% residual mass, HBP-b-0.6BPSBP the next with 97.5% residual mass, and HBP-b-0.5BPSBP the least with 95.6% residual mass.…”

Section: Oxidation Stabilitymentioning

confidence: 99%

Synthesis and Characterization of Poly(5’‐hexyloxy‐1’,4‐biphenyl)‐b‐poly(2’,4’‐bispropoxysulfonate‐1’,4‐biphenyl) with High Ion Exchange Capacity for Proton Exchange Membrane Fuel Cell Applications

Jin

Yue

Yan

et al. 2022

Chemistry An Asian Journal

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Proton exchange membrane (PEM) is pivotal for proton exchange membrane fuel cells (PEMFCs). In the present work, a block copolymer with hydrophilic alkyl sulfonated side groups and hydrophobic flexible alkyl ether side groups, poly(5'-hexyloxy-1',4-biphenyl)-b-poly(2',4'-bispropoxysulfonate-1',4-biphenyl) (HBP-b-xBPSBP), is designed and synthesized by copolymerization of the hydrophilic and hydrophobic oligomers. The oligomers are synthesized via a Pd-catalyzed Suzuki cross-coupling of 1,3-dibromo-5-hexyloxybenzene, and 3,3'-[(4,6-dibromo-1,3phenylene)bis(oxy)]bis(propane-1-sulfonate) or 1,4-bis(4,4,5,5tetramethyl-1,3,2-dioxaborolan-2-yl)benzene. The good solubility and film-forming characteristics are achieved via the introduction of flexible hexyloxy side groups, and high ion exchange capacity (IEC) is achieved via the introduction of high density of alkyl sulfonated side groups. The HBP-b-0.5BPSBP has the highest IEC of 3.17 mmol/g, the highest proton conductivity of 43.5 mS/cm at 95 °C and 90% relative humidity (RH) and low methanol permeability of 6.45 × 10 À 7 cm 2 /s. Meanwhile, crosslinked HBP-b-xBPSBP exhibits promising water uptake, swelling ratio and low methanol permeability. These characteristics are attributed to the crosslinked structure and the hydrophilic/hydrophobic nanophase separation morphology promoted by the poly(mphenylene) main chains, flexible alkyl ether groups, and alkyl sulfonated side groups.

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“…So, many researchers turned to developing alternatives to Nafion ® . Many fluorine-containing [ 12 , 13 ] and non-fluorinated polymers have been developed.…”

Section: Introductionmentioning

confidence: 99%

A Robust Composite Proton Exchange Membrane of Sulfonated Poly (Fluorenyl Ether Ketone) with an Electrospun Polyimide Mat for Direct Methanol Fuel Cells Application

Cheng

Ren

et al. 2021

Polymers

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As a key component of direct methanol fuel cells, proton exchange membranes with suitable thickness and robust mechanical properties have attracted increasing attention. On the one hand, a thinner membrane gives a lower internal resistance, which contributes highly to the overall electrochemical performance of the cell, on the other hand, strong mechanical strength is required for the application of proton exchange membranes. In this work, a sulfonated poly (fluorenyl ether ketone) (SPFEK)-impregnated polyimide nanofiber mat composite membrane (PI@SPFEK) was fabricated. The new composite membrane with a thickness of about 55 μm exhibited a tensile strength of 35.1 MPa in a hydrated state, which is about 65.8% higher than that of the pristine SPFEK membrane. The antioxidant stability test in Fenton’s reagent shows that the reinforced membrane affords better oxidation stability than does the pristine SPFEK membrane. Furthermore, the morphology, proton conductivity, methanol permeability, and fuel cell performance were carefully evaluated and discussed.

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Enhanced ion conductivity of sulfonated poly(arylene ether sulfone) block copolymers linked by aliphatic chains constructing wide-range ion cluster for proton conducting electrolytes

Cited by 70 publications

References 58 publications

Sulfonated poly(styrene‐isobutylene‐styrene) grafted with hexyl‐ and butyl‐imidazolium chloride ionic liquids

Sulfonated poly(styrene‐isobutylene‐styrene) grafted with hexyl‐ and butyl‐imidazolium chloride ionic liquids

Synthesis and Characterization of Poly(5’‐hexyloxy‐1’,4‐biphenyl)‐b‐poly(2’,4’‐bispropoxysulfonate‐1’,4‐biphenyl) with High Ion Exchange Capacity for Proton Exchange Membrane Fuel Cell Applications

A Robust Composite Proton Exchange Membrane of Sulfonated Poly (Fluorenyl Ether Ketone) with an Electrospun Polyimide Mat for Direct Methanol Fuel Cells Application

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