Sulfonated Poly(Arylene Ether Sulfone) and Perfluorosulfonic Acid Composite Membranes Containing Perfluoropolyether Grafted Graphene Oxide for Polymer Electrolyte Membrane Fuel Cell Applications

Lim, Min-Young; Kım, Kihyun

doi:10.3390/polym10060569

Cited by 17 publications

(5 citation statements)

References 55 publications

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“…A trifluorotoluene/butyl acetate mixture was used as the reaction medium because trifluorotoluene or other fluorinated solvents (such as methoxyperfluorobutane) alone could not dissolve LASQ but could dissolve FP-COOH, while in contrast, butyl acetate alone did not dissolve FP-COOH but dissolved LASQ. Triethylamine was chosen as the catalyst because tetrabutylammonium bromide (TBAB) 43 caused LASQ to degrade while 4-dimethylaminopyridine 44 was not as efficient and could not be as easily removed from the reaction mixture as triethylamine. A reaction temperature of 105 °C was identified because the extent of the reaction was low when 70 °C was used, and we wanted to avoid using a reaction temperature higher than the boiling point of trifluorotoluene.…”

Section: Synthesis and Characterization Of M-lasq-fpmentioning

confidence: 99%

Facile Preparation of a Transparent and Rollable Omniphobic Coating with Exceptional Hardness and Wear Resistance

Lai

Liu

2022

ACS Appl. Mater. Interfaces

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The encapsulating film for the touchscreen of a foldable smartphone consists of a flexible polymer layer covered by a hard coating and an antismudge coating, and the two coating layers are currently deposited via separate steps. This paper reports the preparation of a bilayer bifunctional coating via the deposition of a single polymer mixture. The base material for the coating is a ladder-like polysilsesquioxane (LASQ) that is derived from the sol−gel chemistry of 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane. Reacting a limiting amount of the liquid antismudge agent FP-COOH, which is a perfluorinated poly(propylene oxide) bearing a terminal carboxyl group, with LASQ yields m-LASQ-FP, a mixture of unreacted LASQ, and a graft copolymer LASQ-FP. m-LASQ-FP at a fluorine mass fraction of 6.0% is photocured to yield a coating with a surface energy of 12.3 ± 1.5 mJ/m 2 . At a thickness of 40 μm, the coating has at 500 nm a transmittance of >99% measured against its glass substrate, a remarkable nanoindentation hardness H value of 1.4 GPa, and a pencil hardness of > 9H. After being abraded for 300 strokes under a pressure of 26 kPa with steel wool, the coating exhibits no noticeable degradation in its ink contraction properties. At a thickness of 10 μm on a poly(ethylene terephthalate) film, the coating can undergo inward (on the inner surface of the bend) and outward bending to radii <1 and <2 mm, respectively, without cracking. Aside from being a superb candidate as a protective antismudge coating for foldable smartphones, this marvelous material should also have many other applications.

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Section: Synthesis and Characterization Of M-lasq-fpmentioning

confidence: 99%

Facile Preparation of a Transparent and Rollable Omniphobic Coating with Exceptional Hardness and Wear Resistance

Lai

Liu

2022

ACS Appl. Mater. Interfaces

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“…Among the various PEMs, sulfonated poly(ether ether ketone) (SPEEK) has attracted great attention due to its good mechanical strength, high chemical stability, and low cost [ 4 , 5 , 6 ]. Generally, high proton conductivity can be achieved when SPEEK has a high degree of sulfonation (DS) [ 7 , 8 ], while the high DS also results in high water uptake, leading to poor dimensional stability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Proton Conductivity in Sulfonated Poly(ether ether ketone) Membranes by Incorporating Sodium Dodecyl Benzene Sulfonate

et al. 2019

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It is of great importance to improve the proton conductivity of proton exchange membranes by easy-handling and cost-efficient approaches. In this work, we incorporated a commercially obtained surfactant, sodium dodecyl benzene sulfonate (SDBS), into sulfonated poly(ether ether ketone) (SPEEK) through solution casting to prepare SPEEK/SDBS membranes. When no more than 10 wt % SDBS was added, the SDBS was well dissolved into the SPEEK matrix, and the activation energy for the proton transfer in the SPEEK/SDBS membranes was greatly reduced, leading to significant enhancement of the membrane proton conductivity. Compared with the SPEEK control membrane, the SPEEK/SDBS membrane with 10 wt % SDBS showed a 78% increase in proton conductivity, up from 0.051 S cm−1 to 0.091 S cm−1, while the water uptake increased from 38% to 62%. Moreover, the SPEEK/SDBS membrane exhibited constant proton conductivity under a long-term water immersion test.

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“…The one at 832 cm À1 without any indication of ring bending near 690 cm À1 confirms the presence of sulfonic groups at the para position of the benzene ring. 39,35 No significant shifts were observed for the PAES A or B copolymers signals; however, a redshift was observed on two SIBS 88 signals. The peak at 1123 shifted to 1105 cm À1 and the one at 1033 to 1023 cm À1 when the SIBS 88 ratio on the blends was increased.…”

Section: Fourier-transform Infrared Spectroscopymentioning

confidence: 90%

High‐performance blended membranes based on poly(arylene ether sulfone) and sulfonated poly(styrene‐isobutylene‐styrene) for direct methanol fuel cell applications

Ramos‐Rivera

Suleiman

2021

J of Applied Polymer Sci

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In this study, two series of poly(arylene ether sulfone)s (PAES) with hydrophobic blocks made of 4,4 0 -dihydroxyphenyl (BP) and 2,2-bis(4-hydroxyphenyl) propane (BPA) were synthesized. The copolymers were prepared by a coupling reaction between decafluorobiphenyl (DFBP) end-capped nonsulfonated block (PAES A or B) and sulfonated block (SPAES B). The reactive behavior of DFBP facilitates the low-temperature coupling reaction (below 105 C). The final copolymers were blended at distinct weight percent ratios (0, 20, 30, and 40) with poly(styrene-b-isobutylene-b-styrene) (SIBS) at a sulfonation level of 88% to obtain strong and flexible membranes. Morphological, thermal stability, and conduction properties of the resulting membranes were measured and reported here. Results suggest that phase segregation between hydrophobic and hydrophilic domains occurs below 1 meq. g À1 ion exchange capacity. These membranes have low water absorption and high thermal stability. Incorporating SIBS 88 into the blend added elastomeric behavior enhancing transport properties and additional ionic domains, achieving proton conductivities of 0.21 S cm À1 for BPA-based membranes at 50 C (40% SIBS 88). The selectivity of the studied membranes surpasses Nafion ® 117, making them strong candidates for proton exchange membranes in direct methanol fuel cell applications.

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Sulfonated Poly(Arylene Ether Sulfone) and Perfluorosulfonic Acid Composite Membranes Containing Perfluoropolyether Grafted Graphene Oxide for Polymer Electrolyte Membrane Fuel Cell Applications

Cited by 17 publications

References 55 publications

Facile Preparation of a Transparent and Rollable Omniphobic Coating with Exceptional Hardness and Wear Resistance

Facile Preparation of a Transparent and Rollable Omniphobic Coating with Exceptional Hardness and Wear Resistance

Enhanced Proton Conductivity in Sulfonated Poly(ether ether ketone) Membranes by Incorporating Sodium Dodecyl Benzene Sulfonate

High‐performance blended membranes based on poly(arylene ether sulfone) and sulfonated poly(styrene‐isobutylene‐styrene) for direct methanol fuel cell applications

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