Sulfonated polymer-based materials, among heterogeneous catalysts, are frequently utilized in chemical transformations due to their outstanding and physical durability. In this regard, a magnetic sulfonated melamine–formaldehyde resin (MSMF) catalyst was successfully prepared from mixture of Fe3O4 nanoparticles two steps. MSMF used as for the one-pot, three-component condensation benzyl pyrazol...

Hydraulic fracturing is widely used to create cracks and increase the size connectivity of existing fractures, leading higher permeability shale rocks production unconventional hydrocarbon sources. The main chemicals in hydraulic fluids can initiate fractures reservoirs by acid induced carbonate dissolution, minimise energy loss during pumping process friction reducer enhanced fluid viscosity. ...

In the title compound, 4-[3-(3-sulfonato-pyridin-1-ium-4-yl)prop-yl]pyridin-1-ium-3-sulfonate, C(13)H(14)N(2)O(6)S(2), the mol-ecule is zwitterionic, with the sulfonic acid proton transfered to the basic pyridine N atom. Also, the structure adopts a butterfly-like conformation with the sulfonate groups on opposite sides of the 'wings'. The dihedral angle between the two pyridinium rings is 83.5...

sulfonated poly (ether ether ketone) (speek) with a low degree of sulfonation (ds = 40%) was prepared for proton exchange membrane fuel cells (pemfc). poly (ether ether ketone) (peek) was sulfonated in concentrated h2so4 under n2 atmosphere and characterized by the hydrogen nuclear magnetic resonance (h-nmr) technique. after preparation of the speek polymer, the obtained polymer was dissolved i...

Developing a coarse-grained force field for polyacrylamide based on quantum mechanics equation of state.

For improving the hydrolytic stability of sulfonated polyimides consisting five membered anhydrides, novel (NSPIs) were prepared via polymerization 3,3?,4,4?-benzophenonetetracarboxylic dianhydride (BTDA), with a diamine monomer pendant sulfonic acid group and 4,4-oxydianiline. Water uptake this NSPI an excellent film-forming ability was almost equal to that Nafion® 117, while their ion exchang...