Structural and thermal study of terpolymer resin-II derived from p-hydroxybenzaldehyde, succinic acid and ethylene glycol

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.

Author(s): Amit N. Guptaa, Vinay V. Hiwaseb, Ashok B. Kalambec and N. T. Khatyd

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