Authors : C. S. Makde1, M. Ahamed1 and W. B. Gurnule2
Page Nos : 761-769
Description :
Polycondensation technique was employed to synthesize copolymer resins of 2,4-dihydroxyacetophenone, adipamide, and formaldehyde in acidic medium with mole proportion of 1:1:2. The copolymer was characterized by ultraviolet, infra-red, nuclear magnetic resonance (1H and 13C) spectroscopy, scanning electron microscopy (SEM) and X- ray diffraction analysis (XRD). The thermal decomposition pattern and the kinetics of thermal decomposition of the copolymers were investigated by thermogravimetric analysis (TGA) in a static nitrogen atmosphere at a heating rate of 10° C/min. Freeman–Carroll, Sharp– Wentworth, Freidman‟s, Chang and Coat Redfern methods have been adopted to evaluate the kinetic and thermodynamic parameters such as thermal activation energies (Ea), order of the reaction (n), entropy change (ΔS), free energy change (ΔF), apparent entropy (S*), and frequency factor
