Resin I: Synthesis, characterization, and ion‐exchange properties of terpolymer resins derived from 2,4‐dihydroxypropiophenone, biuret, and formaldehyde

Abstract

Terpolymers (2,4-DHPBF) were synthesized by the condensation of 2,4-dihydro-xypropiophenone, biuret, and formaldehyde in the presence of acid catalyst with varying the molar ratio of reacting monomers. Terpolymer composition has been determined on the basis of their elemental analysis and their number-average molecular weight of these resin were determined by conductometric titration in nonaqueous medium. The viscosity measurements were carried out in N,N-dimethyl formamide which indicate normal behavior. IR spectra were studied to elucidate the structure. The terpolymer resin has been further characterized by UV-visible and 1 H-NMR spectra. The newly synthesized terpolymers proved to be selective chelating ion-exchange terpolymers for certain metals. The chelating ion-exchange properties of this terpolymer was studied for Fe (III), Cu (II), Hg (II), Cd (II), Co (II), Zn (II), Ni (II), and Pb (II) ions. A batch equilibrium method was employed in the study of the selectivity of metal ion uptake involving the measurement of the distribution of a given metal ion between the terpolymer 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 (III), Hg (II), Cd (II), and Pb (II) ions than for Cu (II), Co (II), Zn (II), and Ni (II) ions.

Terpolymer resin VIII: Chelation ion‐exchange properties of 2,4‐dihydroxybenzophenone‐oxamide‐formaldehyde terpolymer resins

“…The bands observed at 770–810 cm −1 , 1180–1240 cm −1 , and 1280–1350 cm −1 suggest the presence of methylene bridges 17. In the polymer chain 1,2,3,4,5‐pentasubstitution of aromatic ring is recognized from the bands appearing at 1282, 1179, 1070, 977, and 813 cm −1 , respectively 18…”

Copolymer resin. VII. 8‐hydroxyquinoline‐5‐sulfonic acid–thiourea–formaldehyde copolymer resins and their ion‐exchange properties

“…A similar trend was observed by earlier investigators. 17,22 The results of this study are helpful in selecting the optimum pH for the selective uptake of a metal ion from a mixture of different ions. The selective uptake of the metal ions was studied by the adjustment of the optimum pH of 2.5.…”

Sorption Studies of Terpolymers Based onp-Nitrophenol, Triethylenetetramine, and Formaldehyde

“…The solid was washed; the filtrate and washing were combined and estimated for metal ion content by titration against standard ethylene-diaminetetraacetic acid (EDTA) using appropriate buffer and suitable indicator as reported in Table 1 (29). The amount of metal ion uptake of polymer was calculated from the difference between a blank reading and experimental reading (30 A c c e p t e d M a n u s c r i p t 8 ratios of terpolymer resins and results with eight different metal ions are incorporated in Figure 1 (a-l).…”