Well-defined block copolymer ionomers and their blend membranes for proton exchange membrane fuel cell

Erdogan, Tuba; Ünveren, Elif Erdal; İnan, Tülay Yılmaz; Birkan, Burak

doi:10.1016/j.memsci.2009.07.048

Cited by 32 publications

(13 citation statements)

References 47 publications

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“…For this purpose, PMMA-b-PS BCs of different molar mass were partially sulfonated with a degree of sulfonation (DS) of 34 % and subjected to solvent vapor annealing (SVA) (THF vapors) and TA, to obtain hexagonal-packed cylinders, hexagonally perforated lamellas, and lamellar structures. Erdogan et al synthesized two PMMA-b-PS BCs with a high PS content (88 and 93 mol %) [16]. These polymers were partially sulfonated (DS<30 %) and subsequently used to prepare physical blends of PMMA-b-sPS/ poly(vinylidene fluoride).…”

Section: Introductionmentioning

confidence: 99%

Self-Assembly Investigations of Sulfonated Poly(methyl methacrylate-block-styrene) Diblock Copolymer Thin Films

Piñón-Balderrama

Leyva‐Porras

Olayo-Valles

et al. 2019

Advances in Polymer Technology

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Poly(methyl methacrylate-block-styrene) block copolymers (BCs) of low dispersity were selectively sulfonated on the styrenic segment. Several combinations of degree of polymerization and volume fraction of each block were investigated to access different self-assembled morphologies. Thin films of the sulfonated block copolymers were prepared by spin-coating and exposed to solvent vapor (SVA) or thermal annealing (TA) to reach equilibrium morphologies. Atomic force microscopy (AFM) was employed for characterizing the films, which exhibited a variety of nanometric equilibrium and nonequilibrium morphologies. Highly sulfonated samples revealed the formation of a honeycomb-like morphology obtained in solution rather than by the self-assembly of the BC in the solid state. The described morphologies may be employed in applications such as templates for nanomanufacturing and as cover and binder of catalytic particles in fuel cells.

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Section: Introductionmentioning

confidence: 99%

Self-Assembly Investigations of Sulfonated Poly(methyl methacrylate-block-styrene) Diblock Copolymer Thin Films

Piñón-Balderrama

Leyva‐Porras

Olayo-Valles

et al. 2019

Advances in Polymer Technology

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“…The thermal stability of the copolymer and sulfonated copolymers were investigated by TGA in nitrogen, and the result is shown in Figure 7. The thermogravimetric behavior of a polymer depends on its structure and the type of substituent in the main chain 31. All sulfonated membranes exhibited a typical two‐step degradation pattern.…”

Section: Resultsmentioning

confidence: 99%

Vinyl‐addition type norbornene copolymer containing sulfonated biphenyl pendant groups for proton exchange membranes

Chen

Liu

et al. 2012

J of Applied Polymer Sci

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The vinyl addition type copolymer poly(butoxymethylene norbornene-co-biphenyl oxyhexamethyleneoxymethylene norbornene) (P(BN/BphN)) was synthesized by using bis-(b-ketonaphthylimino)nickel(II)/B(C 6 F 5 ) 3 catalytic system. P(BN/BphN) was sulfonated to give sulfonated P(BN/BphN) (SP(BN/BphN)) with concentrated sulfuric acid (98%) as sulfonating agent in a component solvent. The ion exchange capacity (IEC), degree of sulfonation (DS), water uptake, and methanol permeability of the SP(BN/BphN)s were increased with the sulfonated time. The methanol permeability of the SP(BN/BphN) membranes was in the range of 1.8 Â 10 À7 to 7.5 Â 10 À7 cm 2 /s, which were lower than the value 1.3 Â 10 À6 cm 2 /s of Nafion V R 115. The proton conductivity of SP(BN/BphN) membranes increased with the increase of IEC values, temperature, and water uptake. Water uptake of the SP(BN/BphN) membranes was lower than that of Nafion V R 115 and leads to low proton conduction. Microscopic phase separation occurred in SP(BN/BphN) membrane and domains containing sulfonic acid groups were investigated by SEM and TEM. SP(BN/BphN) membranes had good mechanical properties, high thermal stability, and excellent oxidative stability.

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“…The thermal stability of the copolymer and sulfonated copolymers were investigated by TGA in nitrogen, and the result is shown in Figure 8. The thermo gravimetric behavior of a polymer depends on its structure and the type of substituent in the main chain 28. For all membranes with different DS values, a typical three‐stage weight loss occurred.…”

Section: Resultsmentioning

confidence: 99%

Vinyl‐addition type norbornene copolymers containing flexible spacers and sulfonated pendant groups for proton exchange membranes

Yao

Chen

et al. 2012

J of Applied Polymer Sci

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Novel sulfonated poly(2‐butoxymethylenenorbornene‐co‐2‐(6‐phenoxy‐hexyloxymethylene)‐5‐norbornene [sP(BN/PhHN)] were prepared successfully through vinyl‐addition type polymerization and then sulfonated with concentrated sulfuric acid (98%) as sulfonating agent in a component solvent. The sP(BN/PhHN)‐40 with the maximal degree of sulfonation of 40% can be obtained by controlling the sulfonating reaction time from 8 to 20 h, and a proton conductivity of 3.35 × 10−3 S/cm was achieved at 70°C. The methanol permeabilities of these membranes were in the range from 0.26 to 6.58 × 10−7 cm2/s, which were remarkably lower than Nafion (2.36 × 10−6 cm2/s). TEM analysis revealed that these side‐chain type membranes have a microphase separated structure composed of hydrophilic side‐chain domains and hydrophobic polynorbornene main chain domains. Sulfonated polynorbornene containing soft spacers displayed better properties, such as lower water uptake, high thermal properties, mechanical properties, and low methanol permeability. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Well-defined block copolymer ionomers and their blend membranes for proton exchange membrane fuel cell

Cited by 32 publications

References 47 publications

Self-Assembly Investigations of Sulfonated Poly(methyl methacrylate-block-styrene) Diblock Copolymer Thin Films

Self-Assembly Investigations of Sulfonated Poly(methyl methacrylate-block-styrene) Diblock Copolymer Thin Films

Vinyl‐addition type norbornene copolymer containing sulfonated biphenyl pendant groups for proton exchange membranes

Vinyl‐addition type norbornene copolymers containing flexible spacers and sulfonated pendant groups for proton exchange membranes

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