The terpolymeric resins were prepared by base catalyzed polycondensation ofp-hydroxybenzaldehyde, resorcinol and formaldehyde. Resin obtained by molar monomer composition,p-hydroxybenzaldehyde: resorcinol: formaldehyde as 1:1:3 was abbreviated as PHBRF-I and that prepared by 1:2:4 composition was abbreviated as PHBRF-II. These resins were characterized by physicochemical methods such as elemental analysis, UV-Vis, IR and NMR. ion-exchange study was carried out with Cu2+, Zn2+, Ni2+, Co2+, Pb2+& Cd2+by batch equilibrium method. The rate of metal ion uptake by PHBRF-II terpolymeric resin was higher than that of PHBRF-I. Effect of pH and electrolytes under specified condition were also studied. The terpolymeric resins show high selectivity for Cu2+, Zn2+and Co2+as compared to Ni2+, Pb2+, and Cd2+.
The resin DAPT was derived by condensing 2, 6-diaminopyridine (0.1 M) and terphthalic acid (0.1 M) in presence of DCC (Dicyclohexylcarbodiimide). The materials were characterized by using elemental analysis, 1 H NMR, 13 C NMR, FT-IR and UV-Vis spectra. The molecular weight of resin was determined by non aqueous conductometric titration. In the present paper, electrical conductivity properties of the resin DAPT was studied over a wide range of temperatures. The conductivity of DAPT was found to be in the range 0.1379 to 0.1583 µS cm -1 for temperature range 333-423 K. The activation energy of conduction for DAPT was found to be 0.7692 kJmol -1 .
Terpolymeric resin was prepared from m-cresol (0.1M), hexamine (0.05M) and formaldehyde (0.2M) by acid catalyzed polycondensation method using 1M HCl in temperature range of 122-130°C.The resin was abbreviated as m-CHF-I. The molecular weight of terpolymer was determined by non-aqueous conductometric titration technique. The structure of resin was determined by its elemental analysis, UV-VIS, IR, and NMR data. The thermokinetic parameters were determined using Freeman-Carroll (FC) and Sharp Wentworth (SW) method in temperature range (410-485°C).The values of activation energies (Ea), entropy (∆S), and free energies (∆G) were in good agreement . The order of degradation reaction determined by FC method was confirmed by SW method.
Abstract:The resin-I (abbreviated as SAMF-I) was synthesized by polycondensation reaction of sulphanilic acid (0.05 M), melamine (0.05 M) and formaldehyde (0.15 M) in presence of an acid catalyst (1 M HCl). The structure of resin was determined by its elemental analysis, UV-Vis, IR data. Molecular weight of resin was determined by non aqueous conductometric titration. DC conductivity of the terpolymer was studied over a wide range of temperature. The resin was found to show semiconducting behavior since Wilson's law was obeyed. The conductivity of SAMF-I was found to be in the range 3.8x10 -8 to 2.9x10 -8 mho cm -1 for temperature range 303-423 K. The activation energy of conduction for SAMF-I was found to be 0.981 kJmol -1 .
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