Abstract
The title terpolymer (8-HQ5-SAMF-IV) synthesized by the condensation of 8-hydroxyquinoline 5-sulphonic acid (8-HQ5-SA) and melamine (M) with formaldehyde (F) in the presence of acid catalyst and using varied 3 : 1 : 5 molar proportions of the reacting monomers. The synthesized terpolymer was characterized by different physicochemical techniques. The thermogravimetric analysis of terpolymer resin prepared in the present study has been carried out by nonisothermal thermogravimetric analysis 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 the mode of decomposition and thermal stability. Thermal decomposition curve was studied carefully with minute details. The Freeman-Carroll and Sharp-Wentworth methods have been used in the present investigation to calculate thermal activation energy and different kinetic parameter of the terpolymer resin. Thermal activation energy () calculated by two above mentioned methods, is in close agreement. The advantage of Freeman-Carroll 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 thermogravimetric analysis, various thermogravimetric parameters like frequency factor (Z), entropy change (ΔS), free energy change (ΔF), and apparent entropy () have been determined using Freeman-Carroll method.
Highlights
The synthesized terpolymer resins, showing versatile applications and properties, attracted the attention of scientist and introduced the recent innovations in the polymer chemistry
Terpolymer resins having good thermal stability have enhanced the scope for development of some polymeric materials
The present paper describes the composition of newly synthesized resin, its characterization by elemental analysis, average molecular weight (Mn), determination of intrinsic viscosity in DMSO, FTIR Spectra, UV-Visible absorption spectra, nuclear magnetic resonance (NMR) spectra, and thermal analysis by applying the Sharp-Wentworth and Freeman-Carroll methods
Summary
The synthesized terpolymer resins, showing versatile applications and properties, attracted the attention of scientist and introduced the recent innovations in the polymer chemistry. These terpolymers can be used as high-energy material [1], ion-exchanger [2], semiconductors [3], antioxidants, fire proofing agent, optical storage data, binders, molding materials, and so forth. The present paper describes the composition of newly synthesized resin, its characterization by elemental analysis, average molecular weight (Mn), determination of intrinsic viscosity in DMSO, FTIR Spectra, UV-Visible absorption spectra, NMR spectra, and thermal analysis by applying the Sharp-Wentworth and Freeman-Carroll methods. Energy of activation (Ea), kinetic parameter namely, Z, ΔS, ΔF, S∗, and order of reaction (n) were determined by applying the Freeman-Carroll method
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