Authors: R N Singru W B Gurnule
Publish Date: 2010/02/07
Volume: 100, Issue: 3, Pages: 1027-1036
Abstract
The title terpolymer 8HQ5SAMFII is synthesized by the condensation of 8hydroxyquinoline 5sulfonic acid 8HQ5SA and melamine M with formaldehyde F in the presence of acid catalyst and using 213 M proportions of the reacting monomers The synthesized terpolymer resin is then characterized by different physicochemical techniques viz number average molecular mass determination intrinsic viscosity determination and spectral studies like UV–Visible IR 1H NMR and 13C NMR spectra The morphology of synthesized terpolymer was studied by scanning electron microscopy SEM The thermogravimetry of the terpolymer resin prepared in this study has been carried out by nonisothermal thermogravimetry technique in which sample is subjected to condition of continuous increase in temperature at linear rate Thermal study of the resin was carried out to determine their mode of decomposition and relative thermal stabilities Thermal decomposition curves were studied carefully with minute details The FreemanCarroll and SharpWentworth methods have been used in the present investigation to calculate thermal activation energy and different kinetic parameter of the terpolymer resins Thermal activation energy E a calculated with the two abovementioned methods are in close agreement The advantage of FreemanCarroll method is to calculate both the order of reaction n and energy of activation in one single stage by keeping heating rate constant By using data of thermogravimetry various thermodynamic parameters like frequency factor Z entropy change ΔS free energy change ΔF and apparent entropy S have been determined using FreemanCarroll method
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