Results 131 to 140 of about 851 (169)

Synthesis and properties of novel copolymers of poly(ether ketone biphenyl ketone ether ketone ketone) and poly(ether ketone sulfone amide)

Journal of Polymer Research, 2014
The monomer containing sulfone and amide linkages, namely N,N'-bis(4-phenoxybenzoyl)-4,4'-diaminodiphenyl sulfone (BPBDAS), was conveniently prepared by the condensation of 4,4′-diaminodiphenyl sulfone with 4-phenoxybenzoyl chloride in N,N-dimethylacetamide (DMAc).
Yu Wang, Pingping Wang, Qiang Xu, Tao Yan, Mingzhong Cai   +4 more
openaire   +1 more source

Sodium sulfonate-functionalized poly(ether ether ketone)s

Macromolecular Chemistry and Physics, 1998
A new monomer, sodium 5,5'-carbonylbis(2-fluorobenzenesulfonate) (1), was synthesized by sulfonation of 4,4'-difluorobenzophenone (2) with fuming sulfuric acid. Poly(ether ether ketone)s containing sodium sulfonate groups were synthesized directly via aromatic nucleophilic substitution from the sodium sulfonate-functionalized monomer 1 and Bisphenol A (
Feng Wang, Tianlu Chen, Jiping Xu
openaire   +1 more source

State of the water in crosslinked sulfonated poly(ether ether ketone)

Journal of Applied Polymer Science, 2012
AbstractWe investigated the material properties of different crosslinked sulfonated poly(aryl ether ketone) membranes, focusing on the effect of the degree of sulfonation and crosslinking density on the water uptake, the physical state of the water, and the pore size distribution within the membranes.
Abdul G. Al Lafi, James N. Hay
openaire   +1 more source

Modification of sulfonated poly(ether ether ketone) with phenolic resin

Polymers for Advanced Technologies, 2007
AbstractSoluble phenol formaldehyde resin containing hydroxymethyl groups has been used to modify sulfonated poly(ether ether ketone) (SPEEK). Modification has been carried out with films containing both the polymers and using dimethyl formamide (DMF) as casting solvent at various temperatures under reduced pressure. Associated solvent and the hydrogen‐
P. C. Deb, L. D. Rajput, V. R. Hande, S. Sasane, A. Kumar   +4 more
openaire   +1 more source

Improved interfacial adhesion in carbon fiber/poly (ether ether ketone) composites with the sulfonated poly (ether ether ketone) sizing treatment

Journal of Applied Polymer Science, 2021
AbstractA water‐soluble sulfonated poly (ether ether ketone) (SPEEK) sizing agent is prepared and applied to improve the interfacial adhesion of carbon fiber/poly (ether ether ketone) (CF/PEEK) composites. The surface morphology, surface roughness, surface chemistries, and surface free energy of SPEEK sized CF are obtained to understand the sizing ...
Yanan Su, Peipei Liu, Deqi Jing, Xinghua Zhang, Shouchun Zhang   +4 more
openaire   +1 more source

Rheology of concentrated sulfonated poly(ether ether ketone) solutions

Journal of Applied Polymer Science, 2013
ABSTRACTSulfonated polyether ether ketone (SPEEK), an ionic polymer, has been shown to be a potential candidate for fuel cell electrolyte as a proton exchange membrane. Rheological behavior of SPEEK solutions is of great interest to understand the molecular associations as well as due to implications in membrane processing.
Manish Gupta, Abhijit P. Deshpande, P. B. Sunil Kumar   +2 more
openaire   +1 more source

Synthesis and characterization of sulfonated poly(ether sulfone ether ketone ketone) for proton exchange membranes

Journal of Applied Polymer Science, 2010
AbstractA series of sulfonated poly(ether sulfone ether ketone ketone) (SPESEKK) with different degree of sulfonation (DS) are prepared by the postsulfonation of PESEKK using chlorosulfonic acid as sulfonating agent and concentrated sulfuric acid as solvent.
Weihua Zhou, Jichun Xiao, Yiwang Chen, Rong Zeng, Shuqin Xiao, Xiaohui He, Fan Li, Caisheng Song   +7 more
openaire   +1 more source

Modification of Sulfonated Poly(Ether Ether Ketone) for DMFC Application

2012
One of the most important challenges that our world will face in the twenty-first century will be continuing to meet the ever-increasing energy needs of its citizens. Global concerns over energy sustainability and environmental impacts of fossil fuels have motivated efforts to improve our energy sources.
Jaafar, Juhana, Ismail, Ahmad Fauzi, Norddin, Mohammad Noorul Anam, Matsuura, Takeshi   +3 more
openaire   +1 more source

Synthesis and properties of poly(aryl ether sulfone ether ketone ketone) (PESEKK)

Journal of Applied Polymer Science, 2005
Abstract4,4′‐bis(Phenoxy)diphenyl sulfone (DPODPS) was synthesized by reaction of phenol with bis(4‐chlorophenyl) sulfone in tetramethylene sulfone in the presence of NaOH. Two poly(aryl ether sulfone ether ketone ketone)s (PESKKs) with high molecular weight were prepared by low temperature solution polycondensation of DPODPS and terephthaloyl chloride
Hong‐Li Wen, Cai‐Sheng Song, Yong‐Fen Tong, Lie Chen, Xiao‐Ling Liu   +4 more
openaire   +1 more source

Ionic crosslinking of imidazolium functionalized poly(aryl ether ketone) by sulfonated poly(ether ether ketone) for anion exchange membranes

Journal of Colloid and Interface Science, 2017
Two N3-substituted imidazoles 1,2-dimethylimidazole and 1-butyl-2-methylimidazole were chosen to functionalize poly(aryl ether ketone), respectively. The generated imidazolium cations could electrostatically react with sulfonate ions of the sulfonated poly(ether ether ketone) forming the ionic crosslinking structure of the membranes.
Yixin, Xu, Niya, Ye, Dengji, Zhang, Jingshuai, Yang, Ronghuan, He   +4 more
openaire   +2 more sources