Crosslinked electrolytes based on poly(butoxymethylenenorbornene) for proton exchange membrane

Hu, Jianqiang; Hu, Ting; Zhang, Yanyun; Chen, Yiwang; Zhou, Weihua; Xiao, Shuqin; He, Xiaohui

doi:10.1002/app.34990

Cited by 10 publications

(3 citation statements)

References 25 publications

(36 reference statements)

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“…Norbornene and its derivatives are an unusual class of monomers that can be polymerized by various mechanisms forming polymers with different structures of main chains and properties . This feature, along with the ability to synthesize series of norbornenes with a regularly varying structure, has made these compounds attractive for the macromolecular design of polymers with desired properties and for the systematic study of the relationships “polymer structure‐properties.” Depending on the nature of the side substituents and the structure of the main chain, norbornene‐based polymers can have attractive optical properties, low moisture absorption, thermal and chemical stabilities, promising membrane characteristics, etc. Dicyclopentadiene (DCPD) is one of the most readily available norbornene derivatives, which is obtained by dimerization of cyclopentadiene—a component of light fraction of oil pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

Addition Homo‐ and Copolymerizations of Dicyclopentadiene and 5‐n‐Hexylnorbornene in the Presence of Pd‐N‐Heterocyclic Carbene Complexes

Wozniak

Bermesheva

Гаврилова

et al. 2018

Macro Chemistry & Physics

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Herein for the first time addition homopolymerization of dicyclopentadiene (DCPD) and its copolymerization with 5‐n‐hexylnorbornene in the presence of different Pd‐N‐heterocyclic carbene complexes activated by a borate (Na+[B(3,5‐(CF3)2C6H5)4]− (NaBARF)) or methylaluminoxane (MAO) are investigated. It is found that systems based on Pd‐N‐heterocyclic carbene complex in combination with NaBARF or MAO are effective catalysts and a Pd‐N‐heterocyclic carbene complex/NaBARF system allows for the addition polymerization of these monomers in air. The influence of the N‐heterocyclic carbene structure, the nature of cocatalyst, and solvent on the catalyst activity of a system based on Pd‐N‐heterocyclic carbene complex are determined. The properties of the obtained addition polydicyclopentadiene (poly(DCPD)) such as thermal stability, solid‐state structure, and porosity are studied. The synthesized poly(DCPD) possesses Brunauer, Emmett, and Teller surface area as high as 155 m2 g−1 and so addition polymerization of DCPD can be considered as a single‐step and convenient way to synthesize of porous polymers from a norbornene derivative.

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Section: Introductionmentioning

confidence: 99%

Addition Homo‐ and Copolymerizations of Dicyclopentadiene and 5‐n‐Hexylnorbornene in the Presence of Pd‐N‐Heterocyclic Carbene Complexes

Wozniak

Bermesheva

Гаврилова

et al. 2018

Macro Chemistry & Physics

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“…Several groups have explored this route for the preparation of PEMs, however, once again, the conductivity plummets when the temperature approaches the melting point of the polymer at 140 °C . Very recently, the preparation of PEMs based on insertion PNBE has been reported by Wang et al and Liu et al In both cases, the membranes were first cross‐linked by a difunctional imidazole and were doped with phosphoric acid. These membranes are thermally stable up to 280 °C, and exhibit conductivities up to 4 mS cm −1 at 80 °C.…”

Section: Introductionmentioning

confidence: 99%

Copolymers of ethylene and sulfonated norbornene for proton exchange membranes

Daigle¹,

Dube-Savoie

Tavares

et al. 2013

J. Polym. Sci. Part A: Polym. Chem.

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Terpolymers of ethylene, norbornene, and 5-exo norbornene methyl alcohol are prepared using Pd phosphine sulfonates as catalysts. The pendant hydroxyl groups are then transformed into thioacetate groups. Films cast from the resulting polymers are then oxidized by hydrogen peroxide. This green oxidation method is found to quantitatively transform thioacetate groups into sulfonic acids, leading to the formation of sulfonated hydrocarbon ionomers. These ionomers are thermally stable, exhibit increasing conductivity up to 110 C, and have a low water uptake, indicating that these materials are potentially interesting candidates for the preparation of fuel cell membranes. remain a limiting element in the development of this technology. Currently, the most plausible candidate for a massproduced PEM is NafionV R , a perfluorinated polymer with sulfonic acid as pendant group. 1 An unique feature of Nafion is the microphase separation between the hydrophobic backbone and the hydrated sulfonic acid domains, resulting in the formation of water channels for the transport of protons.2 However, this fluorinated ionomer is expensive and its production requires stringent conditions. Additional drawbacks of Nafion include high methanol permeability, low conductivity at temperatures higher than 100 C and at low relative humidity, and poor mechanical stability at elevated temperature. The search for better PEMs for proton exchange fuel cells remains a challenge for scientists despite a plethora of articles regarding this issue.

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“…Recently, much attention has been paid to the fuel cells based on proton exchange membranes because proton exchange membrane fuel cells (PEMFCs) can use hydrogen as feedstock and effectively avoid environmental pollution. 1,2 In addition, PEMFCs have a greater power density and more efficiency in the conversion of chemical to electrical energy in comparison with conventional internal combustion engines. An important limiting factor for development of PEMFCs is how to develop high-quality proton exchange membrane materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of polyacrylonitrile doped PVDF/heteropoly acid composite membranes

Guo

Chen

Kim

2012

High Performance Polymers

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A novel polyacrylonitrile (PAN)/phosphotungstic acid (PWA) doped PVDF composite membrane was successfully prepared by blending electrospinning. Impedance spectroscopy and scanning electron microscopy characterization showed that the electrospun composite membranes possess comparatively higher proton conductivity and well-defined microstructure. In particular, the addition of hydrophilic PAN can effectively improve the water uptake performance of composite membrane and simultaneously no obvious membrane swelling was found. The experimental results showed that excellent composite membranes can be obtained by 30% PAN doping, and more than 30% PAN doping will increase the diameter of composite nanofiber membrane and accelerate the loss of PWA. The production of high-quality composite membranes with optimized PAN and PWA compositions can be achieved, which are promising candidates for proton exchange electrolyte membranes.

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Crosslinked electrolytes based on poly(butoxymethylenenorbornene) for proton exchange membrane

Cited by 10 publications

References 25 publications

Addition Homo‐ and Copolymerizations of Dicyclopentadiene and 5‐n‐Hexylnorbornene in the Presence of Pd‐N‐Heterocyclic Carbene Complexes

Addition Homo‐ and Copolymerizations of Dicyclopentadiene and 5‐n‐Hexylnorbornene in the Presence of Pd‐N‐Heterocyclic Carbene Complexes

Copolymers of ethylene and sulfonated norbornene for proton exchange membranes

Preparation and characterization of polyacrylonitrile doped PVDF/heteropoly acid composite membranes

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