Journal of Scientific and Technical Research (Sharda University, Noida)

Amit N. Gupta ¹, Vinay V. Hiwase ², Ashok B. Kalambe ³, N. T. Khaty ⁴

Affiliations
1 Department of Applied Chemistry, J. D. College of Engineering & Management, Nagpur, IN
2 Arts, Commerce and Science College, Arvi, Dist., Wardha, IN
3 Department of Chemistry, Institute of Science, R.T. Road, Nagpur, IN
4 Department of Applied Chemistry, Priyadarshini College of Engineering, Nagpur, IN

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 120°C. 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 170-500°C. 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 reaction determined by the FC method was confirmed by SW method.

Keywords

Polycondensation, Apparent Entropy, Free Energy, Thermal Degradation, Order of Degradation, Terpolymer.

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Anita D. Kushwaha ¹, Ashok. B. Kalambe ¹, Vinay V. Hiwase ²

Affiliations
1 Department of Chemistry, Institute of Science, Nagpur-440010, (MS), IN
2 Arts, Commerce and Science College, Arvi-442201, Dist-Wardha, (MS), IN

Abstract

The resin (abbreviated as PNPRF-II) was derived from acid catalyzed polycondensation of p-nitrophenol (0.2M), resorcinol (0.1M) and formaldehyde (0.4M) using 1M HCl at 120-125°C. The tentative structure of this resin was determined by elemental analysis, 1H NMR, FT-IR and UV-Vis spectra. The molecular weight was determined by non-aqueous conductometric titration. The thermokinetic parameters were determined using Freeman-Carroll (FC) and Sharp Wentworth (SW) method in temperature range (217-502°C).The values of activation energies (Ea), entropy (ΔS) and free energies (ΔG) obtained by both method. The order of degradation reaction determined by FC method was confirmed by SW method.

Keywords

Polycondensation, Resin, Terpolymer, Activation Energy, Thermal Degradation.

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