Investigation of Thermal Degradation Kinetics of Pyrazabole Centered Two-Armed Poly(methyl methacrylate)

Adnan KURT, Handan AYAZ, Ahmet GÜLTEK
1.830 285

Abstract


A series of two armed polymers of methyl methacrylate (PMMA) was synthesized by atom transfer radical polymerization (ATRP) method using 2,6-dibromopyrazabole as initiator and CuBr/2,2’-bipyridine as catalyst system at 100 °C ended different times. Average number molecular weights and molecular weight distributions of polymer series were recorded with GPC technique and thus, polymerization kinetic was determined. Thermal behavior of two-armed PMMA polymerized at 240 minutes was investigated detailed by TGA method at the heating rates of 5, 10, 15, 20 and 25 oC/min. From TGA results, a linear correlation was determined between the heating rate and the thermal stability of the polymer. Decomposition activation energies of polymer were found to be 120,98 kJ/mol and 112,53 kJ/mol by the Flynn-Wall-Ozawa and Kissinger methods, respectively. Some kinetic methods such as Coats-Redfern, Tang and Madhusudanan were used to investigate the thermal degradation mechanisms of polymer. In the light of obtained kinetic data, it was observed that the thermal decomposition mechanism of the pyrazabole centered two-armed PMMA was followed by D2 type deceleration mechanism at 5 °C/min optimum heating rate.


Keywords


Pyrazabole, Atom Transfer Radical Polymerization (ATRP), Thermogravimetric Analysis, Activation Energy.

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References


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