Semiconducting behaviour and Thermal study of Terpolymeric Resin Derived from p-Nitrophenol, Resorcinol and Formaldehyde

摘要

The resin PNPRF-I were derived from acid catalyzed polycondensation using 1M HCl at 120-1250C by varying monomer composition ratio. The resin obtained by condensing p-nitrophenol (0.1M), resorcinol (0.2M) and formaldehyde (0.4M) was abbreviated as PNPRF-I. The tentative structure of this resin was determined by elemental analysis, 1H NMR, FT-IR and UV-Vis spectra. The molecular weight determination was carried out by non-aqueous conductometric titration. The conductivity of PNPRF-I were found to be in range 0.0926 x 10-6 to 0.3294 x 10-6 mho cm-1 respectively for temperature range 343-573K. The activation energy of conduction for PNPRF-I were found to be 4.089 kJ mole-1.On the basis of above studies, this polymer can be ranked as semiconductor. The thermokinetic parameters were determined using Freeman-Carroll (FC) and Sharp Wentworth (SW) method in temperature range (228-4630C).The values of activation energies (Ea), entropy (ΔS) and free energies (ΔG) were in good agreement. The order of degradation reaction determined by FC method was confirmed by SW method.