Kurt, Adnan; Koca, Murat published the artcile< Synthesis, characterization and thermal degradation kinetics of pyrazole derived methacrylate polymer, poly(1,3-diphenyl-1H-pyrazol-5-Yl methacrylate)>, Application In Synthesis of 94-02-0, the main research area is polydiphenyl pyrazol methacrylate preparation thermal degradation activation energy; Pyrazole derived polymer; activation energy; reaction mechanism; synthesis and characterization; thermal degradation kinetics.
Since the behavior and properties of macromol. pyrazole derived polymers differ from their small mols., such polymers are in the class of well-defined functional polymers due to the fact that the pyrazole ring contains two π-bonds as well as two hetero atoms in its structure, and this feature makes them important in the fields of scientific and technol. applications. In present study, therefore, we synthesized a new pyrazole derived methacrylate monomer, 1,3-diphenyl-1H-pyrazol-5-yl methacrylate, from the reaction of 1,3-diphenyl-5-pyrazolone with methacryloyl chloride in the presence of triethylamine. After that, its homopolymerization was carried out by free radical polymerization method at 60°C initiated with benzoyl peroxide. Spectral characterizations were achieved by 1H-NMR and FTIR spectroscopies. The kinetics of thermal degradation of the new polymer, poly(1,3-diphenyl-1H-pyrazol-5-yl methacrylate), poly(DPPMA), were investigated by thermogravimetric anal. (TGA) at different heating rates. The initial decomposition temperature of the polymer changed from 216.3°C to 243.5°C depending on the increasing heating rate. The thermal decomposition activation energies in a conversion range of 7-19% were 79.45 kJ/mol and 81.56 kJ/mol by the Flynn-Wall-Ozawa and Kissinger methods, resp. Thermodegrdn. mechanism of the poly(DPPMA) were investigated in detail by using different kinetic methods available in the literature such as Coats-Redfern, Tang, Madhusudanan and Van Krevelen. Among all these methods, the best result was obtained for Coats-Redfern method (E = 90.93 kJ/mol) at the optimum heating rate of 15°C/min for D1 mechanism that is a one-dimensional diffusion type deceleration mechanism.
Acta Chimica Slovenica published new progress about Activation energy. 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, Application In Synthesis of 94-02-0.
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