Dhra, Gulshan published the artcilePolyelectrolyte proton exchange membranes: synthesis and characterization of sulfonated polyimide membranes using novel stilbene-containing diamine, Name: 4-Nitrophenylacetic acid, the publication is Polymer Bulletin (Heidelberg, Germany) (2022), 79(3), 1679-1697, database is CAplus.
A new unsym. diamine, 4-(2-aminophenoxy)-4′-aminostilbene was successfully synthesized and used to synthesize stilbene-containing sulfonated polyimides. 2,2′-Benzidine-disulfonic acid, 1,4,5,8-naphthalene tetracarboxylic dianhydride and different mole ratios of 4-(2-aminophenoxy)-4′-aminostilbene and 2-bis(4-(4-aminophenoxy)phenyl) hexafluoropropane were used for the synthesis of stilbene-containing polyimides with sulfonic acid groups. The synthesized polymers were characterized using various physicochem. characterization techniques such as NMR spectroscopy, IR spectroscopy, differential scanning calorimetry, thermogravimetric anal. and electrochem. impedance spectroscopy. Furthermore, the viscosity, water uptake, ion exchange capacity, swelling ratio, hydrolytic stability, oxidative stability, mech. properties and proton conductivity of the synthesized membranes were also analyzed. Sulfonated polyimide membranes showed a water uptake capacity of 18.93-28.89%, proton conductivity of 0.028-0.039 S cm-1 at 30°C, ion exchange capacity of 1.469 meq g-1 and hydrolytic stability of 40-44 h at 80°C. The solubility of the sulfonated polyimide membranes was improved when unsym. diamine was used to prepare sulfonated polyimides.
Polymer Bulletin (Heidelberg, Germany) published new progress about 104-03-0. 104-03-0 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Carboxylic acid,Benzene, name is 4-Nitrophenylacetic acid, and the molecular formula is C8H7NO4, Name: 4-Nitrophenylacetic acid.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia