నైరూప్య

Synthesis, Characterization and Thermal Degradation Studies of Copolymer Derived From Sallicyladehyde, Melamine and Formaldehyde

Wasudeo B. Gurnule and Sonali S. Dhote

Copolymer (SMF) has been synthesized using the monomers salicylaldehyde, melamine and formaldehyde in 1 : 1 : 3 molar proportions. The structure of SMF copolymer has been elucidated on the basis of elemental analysis and various physicochemical techniques, i.e. UV-Visible, FT-IR and 'H-NMR spectroscopy. Detailed thermal degradation study of the new copolymer has been carried out to ascertain its thermal stability. Thermal degradation curve is discussed which shows three decomposition steps. The activation energy (Ea) and thermal stability calculated by using the Sharp-Wentworth, Freeman-Carroll and Freidman's methods. Thermodynamic parameters such as entropy change (ΔS), apparent entropy change (S*) and frequency factor (z) have also been evaluated on the basis of the data of Freeman-Carroll method. The order of reaction (n) is found out to be 0.99.