Preparation and properties of ionic cross‐linked sulfonated copolyimide membranes containing pyrimidine groups

Jin, Rizhe; Li, Yuhan; Wang, Xing; Qiu, Xuepeng; Ji, Xiangling; Gao, Lianxun

doi:10.1002/pat.1835

Cited by 13 publications

(4 citation statements)

References 50 publications

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“…Branched and/or cross-linked polymers counteract the hydration-related stresses better than their linear-chain counterparts; such types of SPIs have been reported. ,− Branched and/or cross-linked polymers have typically demonstrated higher degradation stability than their linear equivalents. Another way to reduce the polymer chain tension upon hydration is the use of flexible polyimide chains. − However, although the polymer chain flexibility accommodates the mechanical stresses of water absorption, the flexibility also interferes with the repolymerization of the polyimide backbone (see point h).…”

Section: Non-nafion Spementioning

confidence: 99%

Review of Advanced Materials for Proton Exchange Membrane Fuel Cells

2014

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The scientific community is focused on the development of inexpensive and high-performing membrane materials for proton exchange membrane (PEM) fuel cells (FCs). The major approach to reducing the cost of FCs, which is crucial for the widespread acceptance of FCs as energy sources for various practical applications, is reducing the cost of the membrane. Efforts are being made in the development of advanced polymeric materials, which will satisfy the technical and economic demands of the consumers. Because most alternative membranes are outperformed by Nafion membranes over an entire set of important properties, it may be worthwhile to compromise on certain parameters to develop alternative specialized membranes. This review presents the properties (mainly conductivity and chemical and mechanical stability) of modern solid polymer electrolytes (SPEs) for PEM FCs.

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Section: Non-nafion Spementioning

confidence: 99%

Review of Advanced Materials for Proton Exchange Membrane Fuel Cells

2014

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“…For instance, the highest tensile strength of 52.9 MPa was achieved at the CNTs−C@N content was 1.0 wt %, which was 123.2 % higher than that of SPEEK membrane. This was attributed to the electrostatic attraction between the basic shell polymer on CNTs−C@N and the SPEEK interface, which inhibited chain mobility [25] . Furthermore, CNTs have excellent mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

“…This was attributed to the electrostatic attraction between the basic shell polymer on CNTsÀ C@N and the SPEEK interface, which inhibited chain mobility. [25] Furthermore, CNTs have excellent mechanical properties. Elongation at break of the composite membranes after the CNTsÀ C@N was lower than that of SPEEK membrane.…”

Section: Thermal and Mechanical Properties Of Composite Membranesmentioning

confidence: 99%

Dual Proton Conducting Channels Constructed by Acid‐Base Double‐Shell Carbon Nanotubes to Boost the Proton Conductivity of SPEEK

et al. 2022

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Sulfonated poly(ether ether ketone) (SPEEK) has been widely investigated as a substitution of commercial Nafion as proton exchange membranes (PEMs). However, the disadvantages such as shrinkage of proton transfer channels at high temperature and low humidity conditions cannot be neglected. In this manuscript, the carboxyl and imidazole double‐shelled carbon nanotubes(CNTs−C@N) was incorporated into the SPEEK matrix to fabricate composite PEM (denoted as SPEEK/CNTs−C@N−Y, Y is the percentage composition of CNTs−C@N), serving as one‐dimensional fillers. SPEEK/CNTs−C@N‐1.0 composite membrane performed a higher horizontal proton conductivity (0.302 S/cm) under 80 °C and 100 % relative humidity (RH) compared with original SPEEK membrane 0.181 S/cm. The high proton conductivity could be mainly attributed to the dual proton conducting channel formed by two types of acid‐base pairs, which immensely promote the Grotthuss mechanism. Therefore, SPEEK/CNTs−C@N composite membranes are expected to develop PEMs with high proton conductivity at high temperature and low humidity.

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“…The authors of [26] synthesized a series of sulfonated copolyimides containing pyrimidine groups by copolycondensation of 1,4,5,8-naphthalenetetracarboxylic dianhydride, 2-(4-aminophenyl)-5-aminopyrimidine, and 2,2'-disulfonic acid 4,4'-diaminodipenylether. Due to the protonation of the N atoms of the pyrimidine groups by the protons of the sulfonic acid groups, zwitterion fragments are formed in the macromolecular chain, whose presence imparts the membranes based on these materials with excellent stability in water, improved mechanical properties, and decreased permeability for methanol.…”

Section: Introductionmentioning

confidence: 99%

Sodium p-Styrene Sulfonate–1-Vinylimidazole Copolymers for Acid–Base Proton-Exchange Membranes

Лебедева

Pozhidaev

Малахова

et al. 2020

Membr. Membr. Technol.

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Binary copolymers possessing thermal stability up to 290°C and suitable for the formation of ionexchange membranes have been obtained by free radical copolymerization of sodium p-styrene sulfonate and 1-vinylimidazole with subsequent conversion to the H-form. The composition and structure of the copolymers are confirmed by elemental analysis and IR and NMR spectroscopy. Multicomponent membranes based on the copolymers of sodium p-styrene sulfonate and 1-vinylimidazole have been obtained using poly(vinyl alcohol) crosslinked by oxalic acid as a film-forming agent. It is shown by scanning electron microscopy that the surface and cut of the membranes have a uniform structure. The specific electric conductivity of the membranes with different concentrations of styrene sulfonic acid (20 to 80 mol % in the copolymer) increases with an increase in the fraction of styrene sulfonic acid and is 29.5 to 52.0 mS cm −1 at 80°C. The activation energy of proton transport of the membranes is 12.5 to 15.5 kJ mol −1. The water uptake of the membranes decreases with the increase in the concentration of the basic (imidazole) component in them, which may be associated with the increase in the density of ionic crosslinking due to the acid-base interaction of the sulfo groups and pyridine nitrogen atoms of the imidazole cycle. The formation of acid-base pairs results in the formation of continuous proton transport channels in addition to the sulfonic acid channels, which is confirmed by the high values of specific electric conductivity even in the case of a decrease in the concentration of sulfostyrene in the composition of the membrane. Increasing the concentration of 1-vinylimidazole in the composition of the copolymer from 20 to 80 mol % leads to an increase in the relative elongation at break from 3 to 6%, an increase in the tensile strength at break from 4 to 7 MPa, a decrease in the Young modulus of the membranes from 127 to 102 MPa, and a decrease in the water uptake from 45 to 15.

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Preparation and properties of ionic cross‐linked sulfonated copolyimide membranes containing pyrimidine groups

Cited by 13 publications

References 50 publications

Review of Advanced Materials for Proton Exchange Membrane Fuel Cells

Review of Advanced Materials for Proton Exchange Membrane Fuel Cells

Dual Proton Conducting Channels Constructed by Acid‐Base Double‐Shell Carbon Nanotubes to Boost the Proton Conductivity of SPEEK

Sodium p-Styrene Sulfonate–1-Vinylimidazole Copolymers for Acid–Base Proton-Exchange Membranes

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