Amit N. Gupta
Terpolymer abbreviated as HBUE-II was synthesized by polycondensation using monomers p-hydroxybenzaldehyde (0.2M), urea (0.1M) and ethylene glycol (0.4M) in the presence of polyphosphoric acid as catalyst at 120oC. Terpolymer was characterized by elemental analysis, FT-IR, 1H NMR and UV-Visible spectra. Thermokinetic parameters were calculated by using Freeman-Carroll (FC) and Sharp-Wentworth (SW) methods in the temperature range 270°C – 625°C. The values of the activation energy (Ea), frequency factor (A), apparent entropy change (ΔS) and free energy changes (ΔG) were in good agreement. The order of degradation reaction determined by the FC method was confirmed by SW method
