Research Article
Amit N. Guptaa, Vinay V. Hiwas
Abstract
Resin abbreviated as HBSE-II was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.2M), succinic acid (0.1M) and ethylene glycol (0.4M) at 120oC. The molecular weight was determined by non-aqueous conductometric titration. Terpolymer was characterized by elemental analysis, FT-IR, 1H NMR and UV-Visible spectroscopy. Thermokinetic parameters were calculated by using Freeman-Carroll (FC) and Sharp-Wentworth (SW) methods in the temperature range 405-591oC. The values of the activation energy (Ea), frequency factor (A), apparent entropy change (ΔS*) and free energy change (ΔG) were in good agreement. The order of degradation obtained by the FC method was found to be 0.3 which was further confirmed by SW method.