Synthesis, Characterization and Thermal Decomposition of p-Hydroxyacetophenone-aniline-formaldehyde terpolymeric Ligand

Abstract

Terpolymeric ligand, p-hydroxyacetophenone-aniline-formaldehyde (PAF) has been synthesized by the condensation of p-hydroxyacetophenone and aniline with formaldehyde in the presence of an acid catalyst in 1:2:4 molar proportions of the reacting monomers. The characterization of terpolymeric ligand has been done on basis of elemental analysis, IR and ¹H NMR. Thermal decomposition curve shows single decomposition step (270-495 ºC). The Sharp-Wentworth and Freeman-Carroll methods have been used to calculate thermal activation energy and thermal stability. Thermal activation energy (E_a) calculated by Sharp-Wentworth (20.89 KJ/mol) method and Freeman-Carroll (21.08 KJ/mol) method are in good agreement. Thermal decomposition of the terpolymeric ligand has been carried out to determine their mode of decomposition, the activation energy (E_a), order of reaction (n), frequency factor (Z), entropy change (DS), free energy change (DF) and apparent entropy change (S*) on basis of Freeman-Carroll method.