Resin‐V: Synthesis and physicochemical studies of a biphenol–guanidine–formaldehyde terpolymer resin

Abstract

A terpolymer resin was synthesized by the condensation of 2,2 0 -dihydroxybiphenyl with guanidine and formaldehyde in the presence of 2M HCl as a catalyst. The resin obtained was characterized on the basis of elemental analysis, infrared spectroscopy, NMR spectroscopy, ultraviolet-visible spectroscopy, and thermogravimetric analysis/differential thermal analysis. The number-average molecular weight was determined by nonaqueous conductometric titration. A thermal study of the resin was carried out to determine its mode of decomposition, activation energy, order of reaction, frequency factor, entropy change, free energy, and apparent entropy change. The FreemanCarroll and Sharp-Wentworth methods were applied for the calculation of the kinetic parameters, and the data from the Freeman-Carroll method were used to determine various thermodynamic parameters. The chelation ion-exchange properties of this resin were studied for Fe 3þ , Cu 2þ , Ni 2þ , Co 2þ , Zn 2þ , Cd 2þ , and Pb 2þ ions. A batch equilibrium method was used in the study of the selectivity of the metalion uptake that involved the measurements of the distribution of a given metal ion between the polymer sample and a solution containing the metal ion. The study was carried out over a wide pH range and in media of various ionic strengths. The terpolymer showed a higher selectivity for Fe 3þ ions than for the other metal ions in this study.

Guanidylated hollow fiber membranes based on brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO) for gold sorption from acid solutions

“…For both APPO-2 and GPPO-2-1.0, the distribution ratio of gold is much higher than that of other metals, which means APPO and GPPO both have selectivity toward gold. The sorption of other metal ions follows the order: Fe(III) > Pb(II) > Cu(II) ≈ Co(II) ≈ Zn(II) > Ni(II) > Mg(II), which is generally in accordance with some reported results [29].…”

Synthetic functionalized terpolymeric resin for the removal of hazardous metal ions: synthesis, characterization and batch separation analysis

“…The other metal ions such as Co 2+ , Zn 2+ , and Pb 2+ found to have lower distribution values. The distribution ratio for all the metal ions depends upon their stability constants of the complexation during the ion‐exchange process . The higher the distribution ratio of the metal ions, higher will be the stability constants of the ligand and metal complexation.…”

“…The distribution ratio for all the metal ions depends upon their stability constants of the complexation during the ion-exchange process. [28][29][30] The higher the distribution ratio of the metal ions, higher will be the stability constants of the ligand and metal complexation. , and Pb 2+ form weak chelates over the wide range of pH variations.…”

Microwave assisted synthesis, characterization and thermoacoustical study of a β-naphthol-guanidine-formaldehyde copolymer resin

“…They are widely used as adhesives, lubricants, coating materials, semiconductors, catalysts, ion exchangers, fire resistant materials and also show antibacterial activity. [12][13][14][15] An ultrasonic study gives information about the nature of molecular interactions in solute-solvent and solvent-solvent mixtures. It is a non-destructive and very effective technique for the investigation of various thermodynamic parameters.…”