Results 1 to 10 of about 11,615 (198)
Imidazolium-Based Sulfonating Agent to Control the Degree of Sulfonation of Aromatic Polymers and Enable Plastics-to-Electronics Upgrading [PDF]
JACS AuThe accumulation of plastic waste in the environment is a growing environmental, economic, and societal challenge. Plastic upgrading, the conversion of low-value polymers to high-value materials, could address this challenge.
Chun-Yuan Lo +13 more
doaj +5 more sources
Ion Selectivity and Stability Enhancement of SPEEK/Lignin Membrane for Vanadium Redox Flow Battery: The Degree of Sulfonation Effect [PDF]
Frontiers in Chemistry, 2018 A membrane of high ion selectivity, high stability, and low cost is desirable for vanadium redox flow battery (VRB). In this study, a composite membrane is formed by blending the sulfonated poly (ether ether ketone) with lignin (SPEEK/lignin), and ...
Jiaye Ye +10 more
doaj +3 more sources
Polysulfone with Different Degrees of Sulfonation: Simple Method with Acetyl Sulfate
Orbital: The Electronic Journal of ChemistryIn this work, the authors present as an innovation, the homogeneous sulfonation of Udel® polysulfone (PSU) with acetylsulfate (ACS) under reflux at 45°C in dichloromethane and inert N2 atmosphere (g) for 1.5 h.
Altamiro Xavier de Souza +9 more
doaj +3 more sources
International Journal of Electrochemical Science, 2016 The sulfonic acid groups in SPEEK proton exchange membranes are belonging to hydrophilic groups, which are generally affect the performance of the proton conductivity, methanol permeability and anti- swelling properties.
Fengying Yu, Jiajie Hu
doaj +3 more sources
Designed Monomers and Polymers, 2017 Direct copolymerization of sulfonated and non-sulfonated difluorodiphenyl sulfones as dihalide monomers with hydroquinone and also 4,4′-(4,4′-sulfonylbis-(1,4-phenylene)bis(oxy)) diphenol as diols led to preparation of two series of poly(arylene ether ...
Majid Pirali-Hamedani +1 more
doaj +4 more sources
The correlation of sulfonation reaction kinetics with the degree of sulfonation (DS) and its effects on microstructure and morphology of electrospun fibers for the membrane of fuel cells. [PDF]
RSC Adv, 2023 Sulfonation is among the frequently used surface modification methods to endow new surface properties on polymer fibers. Direct sulfonation is the simplest chemical modification via incorporation of sulfonate functional groups onto fibers' surfaces at ...
Parreño RP.
europepmc +2 more sources
Advanced Sustainable Systems, 2022 The next generation of green ion selective membranes is foreseen to be based on cellulosic nanomaterials with controllable properties. The introduction of ionic groups into the cellulose structure via chemical modification is one strategy to obtain ...
S. Lander +7 more
semanticscholar +3 more sources
Ionics, 2022 There is a strong belief that sulfonated polyether ether ketone (SPEEK) can be used as an alternative to Nafion membrane in PEMFC applications due to its properties that can vary depending on sulfonation degree (DS). In this study, the temperature of the sulfonation reaction was kept constant at 50 degrees C, and SPEEK membranes were synthesized by ...
Yavuz Yağızatlı +3 more
semanticscholar +5 more sources
Studies on the SPEEK membrane with low degree of sulfonation as a stable proton exchange membrane for fuel cell applications [PDF]
Hydrogen, Fuel Cell & Energy Storage, 2017 Sulfonated poly (ether ether ketone) (SPEEK) with a low degree of sulfonation (DS = 40%) was prepared for proton exchange membrane fuel cells (PEMFC).
Mohammad Javad Parnian +2 more
doaj +2 more sources
IOP Conference Series: Materials Science and Engineering, 2021 This study aims to determine the influence of the amount of Ag2SO4 silver sulfate catalyst and amount of time on the degree of sulfonation in waste-based Styrofoam (polystyrene) into Poly-Styrene Sulfonic Acid (PSSA).
R. Manurung +3 more
semanticscholar +2 more sources