1.
Amit N. Gupta
2.
Vinay V. Hiwase
3.
Ashok B. Kalambe
4.
N. T. Khaty
Abstract
Terpolymer abbreviated as HBUE-I was synthesized by polycondensation using monomers p-hydroxybenzaldehyde (0.1M), urea (0.1M) and ethylene glycol (0.3M) in the presence of polyphosphoric acid as catalyst 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 spectra. Thermokinetic parameters were calculated by using Freeman-Carroll (FC) and Sharp-Wentworth (SW) methods in the temperature range 170-5000C. The values of the activation energy (Ea), frequency factor (A), apparent entropy change (?S*) and free energy change (?G) were in good agreement. The order of degradation reaction determined by the FC method was confirmed by SW method.
Keywords Polycondensation, Apparent Entropy, Free Energy, Thermal Degradation, Order of Degradation, Terpolymer
