Fluorinated/non-fluorinated sulfonated polynaphthalimides as proton exchange membranes

Song, Yang; Liu, Chang; Ren, Dianfu; Jing, Liwei; Jiang, Zhenhua; Liu, Baijun

doi:10.1007/s13233-013-1053-2

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…SPI and SPEEK (Figure 1) were prepared in our laboratory. 3,19 Dimethyl sulfoxide (DMSO) and N 0 N-dimethyl acetamide (DMAc) were purchased from Aladdin Reagent Co. Ltd (Shanghai, China). Concentrated sulfuric acid (95-98%) was obtained from Aldrich Chemical Co (Milwaukee, USA).…”

Section: Methodsmentioning

confidence: 99%

“…Recently, we have synthesized a new sulfonated polyimide (SPI) containing -CF 3 groups that possessed good dimensional stability, low methanol permeability, as well as good thermal stability. 19 It will be of interest for us to prepare a new kind of triple-layer membranes based on the high-IEC SPEEK and -CF 3 -containing SPI, which would have a better comprehensive performance over pure SPEEK and SPI.…”

Section: Introductionmentioning

confidence: 99%

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Triple-layer sulfonated poly(ether ether ketone)/sulfonated polyimide membranes for fuel cell applications

Song

Liu

et al. 2013

High Performance Polymers

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A series of triple-layer membranes were prepared based on a sulfonated polyimide (SPI) and a traditional sulfonated poly(ether ether ketone) (SPEEK) polymer matrix. Compared with the single-component membranes (pure SPI and SPEEK), the multicomponent membranes exhibited better comprehensive performance. Interestingly, the triple-layer membranes possessed improved mechanical properties, lower water uptake, and swelling ratio than those of the corresponding blend membranes. When the contents of SPI were 30 and 40%, the triple-layer membranes even had lower methanol permeability (3.42 and 2.61 Â 10 À7 cm 2 s À1 , respectively) than that of the pure SPI membrane (3.51 Â 10 À7 cm 2 s À1 ). The proton conductivity of the triple-layer membranes was in the range of 0.117-0.149 S cm À1 at 100 C. All the results suggest that the triple-layer membranes have sufficiently excellent performance to be applied in fuel cells.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Triple-layer sulfonated poly(ether ether ketone)/sulfonated polyimide membranes for fuel cell applications

Song

Liu

et al. 2013

High Performance Polymers

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“…Due to their unique chemical structure and outstanding properties, polyimides (PIs) have attracted much attention and been widely used as high-strength structural materials, high-temperature resistant films, high-efficiency separation membranes, low- k insulators, and flexible copper clad laminates. 1 –9 Recently, many efforts have been focused on the modifications of the PIs with the improvement of their specific properties without deterioration of their excellent thermal and mechanical properties. Some functional moieties, such as trifluoromethyl (–CF 3 ), sulfonic acid (–SO 3 H), hydroxyl (–OH), and ethynyl groups, were introduced into the PI backbones to enhance the performance of gas permeability, dielectric property, transparency, proton conducting ability, and thermo-mechanical integrity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of the novel polyimides containing cyano and biphenyl moieties

Liu

Shen

et al. 2017

High Performance Polymers

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A series of cyano-functionalized polyimides (CN-PIs) were prepared and derived from a novel diamine monomer having cyano and biphenyl groups. Meanwhile, another series of PIs without cyano groups (H-PIs) were prepared as counterparts for comparison purposes. Both series of PIs exhibited good solvent resistance, good thermal stability, remarkable film-forming ability, and excellent tensile properties. The Tg values of CN-PIs were 260–330°C, which were 10–17°C higher than the corresponding –CN free H-PIs. The CN-PIs exhibited no obvious decomposition below 470°C, and their 5% weight loss temperatures were above 568°C under nitrogen atmosphere. All the CN-PI films had high tensile strength and Young’s moduli, which were related to their rigid backbones and strong interactions between molecular chains. Due to their higher molar polarization, CN-PIs expressed the higher dielectric constants (3.29–3.69 at 1 MHz) in comparison with the corresponding H-PIs. CN-PIs exhibited the improved transparency, and both CN-PIs and H-PIs had better transparency than commercial Kapton® film. Introducing –CN groups could have an effect on the coefficient of thermal expansion and peel strength of the PIs. The peel strength of the PI, which was derived from cyano-functionalized diamine monomer and 4,4′-oxydiphthalic anhydride, could even reach 1.10 N mm-1, suggesting its strong interaction to copper matrix and potential use in flexible circuit board.

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“…[17][18][19] Therefore, we can improve the chemical stability and lifetime of the membranes by suppressing their water uptake and swelling. [20][21][22] Some efforts such as cross linking, porous PTFE reinforcement or improving the hydrophobic properties of the membrane have already been dedicated to suppress membrane swelling and further improve the chemical stability of the membrane. [23][24][25][26][27] In view of the above discussion, advances in materials design such as introducing electron-donating groups ( protecting the ether bond in polymer chains via the conjugation effect) into the SPEEK polymer backbone or restricting water uptake and swelling behaviour of the membrane are expected to improve the chemical stability of the ion exchange membrane.…”

Section: Introductionmentioning

confidence: 99%

Highly stable membranes based on sulfonated fluorinated poly(ether ether ketone)s with bifunctional groups for vanadium flow battery application

Yuan

Duan

et al. 2015

Polym. Chem.

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A facile strategy for fabricating a sulfonated poly (ether ether ketone) ion exchange membrane with high chemical stability, excellent ion selectivity and battery performance is presented. The essence of this strategy lies in the introduction of benzotriflouride bifunctional groups that function as protecting the ether bond (through the conjugation effect of benzene ring) and restricting swelling behaviour of the membrane (resulting from the -CF 3 hydrophobic groups). With introduction of benzotriflouride bifunctional groups, the SFPEEK membrane s exhibited excellent ion selectivity and cell performance under vanadium flow battery (VFB) operation condition, exhibiting columbic efficiency of 98.32% and energy efficiency of 87.74% at a current density of 80 mA cm -2 , which is much higher than commercial Nafion 115 (CE=94.83%, EE=83.25%). A VFB single cell assembled with a SFPEEK membrane shows a stable performance after continuously running more than 1050 cycles, which is by far the longest cycle life reported on sufonated aromatic cation exchange membranes. These results demonstrated that the sulfonated poly (ether ether ketone) ion exchange membranes with benzotriflouride bifunctional groups are promising candidates for VFB systems.

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Fluorinated/non-fluorinated sulfonated polynaphthalimides as proton exchange membranes

Cited by 7 publications

References 34 publications

Triple-layer sulfonated poly(ether ether ketone)/sulfonated polyimide membranes for fuel cell applications

Triple-layer sulfonated poly(ether ether ketone)/sulfonated polyimide membranes for fuel cell applications

Synthesis and properties of the novel polyimides containing cyano and biphenyl moieties

Highly stable membranes based on sulfonated fluorinated poly(ether ether ketone)s with bifunctional groups for vanadium flow battery application

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