Resin abbreviated as HBSE-I was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.1M), succinic acid (0.1M) and ethylene glycol (0.3M) at 1200C. 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 345-4460C. 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 1.91 which was further confirmed by SW method.
