Mevcut çalışmada, kumarin türevli yeni bir monomer olan 3-benzoil kumarin-7-il-metakrilat (BKMA) monomerinin metil metakrilat (MMA) ile farklı bileşimlerde bir seri kopolimeri hazırlandı. Bu amaçla serbest radikal polimerizasyon yöntemi kullanıldı. Spektral karakterizasyonlar FTIR ve 1 H-NMR teknikleri ile başarıldı. Kopolimer sistemlerinin bileşimleri 1 H-NMR spektrumlarından belirlendi. DSC analizinden kopolimer bileşimindeki BKMA oranı %23 seviyesine düştüğünde camsı geçiş sıcaklığında 179 o C'den 165 o C'ye bir azalış görüldü. Poli(BKMA) homopolimeri ve %54 BKMA bileşimli kopolimerin TGA analizinde her iki polimer için başlangıç bozunma sıcaklıkları sırasıyla 321 o C ve 311 o C olarak kaydedildi.
In present study, thermal decomposition studies of a copolymer based the coumarin containing monomer 3-benzoyl coumarin-7-yl-methacrylate (BCMA) and methyl methacrylate [poly(BCMA:0.54-co-MMA:0.46)] were performed by thermogravimetric analysis (TGA). The temperature for maximum rate losses was increased from 384.81 °C to 407.45 °C with the increasing in heating rate from 5 °C/min to 20°C/min. The thermal decomposition activation energies of copolymer in the conversion range of 9% - 21% were resulted to be 212.98 kJ/mol and 210.30 kJ/mol by Kissinger’s and Flynn–Wall–Ozawa methods, respectively. The study of kinetic equations such as Coats-Redfern, Tang, Madhusudanan and Van-Krevelen methods exhibited that the thermal decomposition process of the studied copolymer was followed with a D3 mechanism, a three-dimensional diffusion type deceleration solid state mechanism, at the optimum heating rate of 20 °C/min.
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