Synthesis and ion-exchange studies of resins derived from 2,2′-dihydroxybiphenyl-diamine-formaldehyde

Abstract

Terpolymeric resins (2,2′-DHBPBDF) (DHBP = dihydroxybiphenyl; BD = butylenediamine; F = formaldehyde) were synthesized by the condensation of 2,2′-DHBP, 1,4-BD and formaldehyde in the presence of an acid catalyst with varied molar ratios of reacting monomers. Resin composition was determined on the basis of its elemental analyses. Their number-average molecular weight was determined by conductometric titration in non-aqueous media. The viscosity measurements were carried out in N,N-dimethylformamide at room temperature. Ultraviolet–visible, infrared and proton nuclear magnetic resonance spectral studies were undertaken to elucidate the structure of these resins. The thermal stability and kinetics of the thermal decomposition of these newly synthesized resins have been evaluated on the basis of thermogravimetric analysis and differential thermal analysis. The ion-exchange properties of these resins were studied for different metal ions. A batch equilibrium method was employed to study the selectivity of metal ion uptake. The study was carried out over a wide range of pH and ionic strengths of different electrolytes.

Synthesis, Characterization and Thermal Degradation Study of 2-Nitroso-1napthol- 4, 4’ Diaminodiphenyl Ether-Formaldehyde Terpolymer Resin

“…Third stage of decomposition represents the degradation of -NH side chains with diphenylether ring leads to the gradual mass loss in the temperature range 550 -900 o C.coresponding to the mass loss 99.10% found and 98.93% calculated. The residue left over after complete decomposition was found to be negligible (0.90% found and 1.07% calculated) [22][23][24][25][26]. ©IJRASET (UGC Approved Journal): All Rights are Reserved By using the data obtained from above method, the different thermodynamic parameters like entropy change, free energy change, apparent entropy and frequency factor be calculated and reported in following Table 4 [ [27][28][29].…”