Abstract

Thermal degradation studies of high performance copolymer resin derived from 8-hydroxyquinoline 5-sulphonic acid, semicarbazide and formaldehyde

Author(s): W. B. Gurnule, Jyotsana Khobragade, Mudrika Ahamed

The present investigation deals with the synthesis and thermal degradation studies of resin 8-Hydroxyquinoline 5- sulphonic acid -semicarbazide - formaldehyde derived by the condensation of 8-Hydroxyquinoline 5-sulphonic acid and semicarbazide with formaldehyde in the presence of 2M acetic acid as catalyst with varying molar proportions of reactants. Copolymer composition has been determined on the basis of their elemental analysis. The copolymer has been characterized by UV-visible, FTIR and 1H NMR spectra. The morphology of synthesized copolymer was studied by scanning electron microscopy (SEM). The thermal decomposition behavior of some new copolymers were studied using thermogravimetric analysis in air atmosphere at heating rate of 10 oC/min. Detailed thermal degradation studies of the resin has been carried out to ascertain its thermal stability. The Freeman– Carroll and Sharp– Wentworth methods have been used to calculate activation energy and thermal stability. Thermal activation energy (Ea) calculated with the help of these methods are in agreement with each other. Thermodynamic parameters such as free energy change (ΔF), entropy change (ΔS), apparent entropy change (S*), and frequency factor (z) are also determined on the basis of the TG curves and by using data of the Freeman–Carroll method. Keywords: Thermal degradation, Resin, Thermal stability, Morphology, Characterization, Poly

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