Thermal Degradation Kinetics of Poly(3-Benzoyl Coumarin-7-yl- Methacrylate) Homopolymer Containing Coumarin Side Group

Yıl 2017, Cilt: 7 Sayı: 4, 113 - 121, 31.12.2017

Adnan Kurt

Öz

In present study, thermal degradation kinetics of a new methacrylate polymer containing

coumarin side group, poly(3-benzoyl coumarin-7-yl-methacrylate), was investigated in detail. For this purpose,

thermogravimetric analysis (TGA) was performed by applying a controlled heating program at different heating

rates to specific amounts of polymer samples. When the TGA results were examined, it was concluded that the

thermal stability of polymer was higher with increasing the heating rate. Decomposition activation energies of

polymer were calculated as 155.01 kJ mol-1 and 165.29 kJ mol-1 according to Flynn-Wall-Ozawa and Kissinger

methods, respectively. Coats-Redfern method was also used to investigate the thermal decomposition mechanism

of polymer. In the light of obtained kinetic data, it was determined that the thermal decomposition mechanism of

coumarin derived polymer was followed by D1 one dimensional diffusion type deceleration mechanism at 10 °C

min-1 optimum heating rate.

Anahtar Kelimeler

Activation energy, coumarin derived polymer, thermal degradation kinetics, thermal decomposition mechanism

Kumarin Yan Grup İçeren Poli(3-Benzoil Kumarin-7-il-Metakrilat) Homopolimerinin Termal Bozunma Kinetiği

Öz

Yan grup olarak kumarin halkasını barındıran ve yeni bir metakrilat polimeri olan poli(3-benzoil kumarin-

7-il-metakrilat) polimerinin termal bozunma kinetiği mevcut çalışmada detaylıca araştırıldı. Bu amaçla, belirli

miktardaki polimer örneklerine farklı ısıtma hızlarında kontrollü bir ısıtma programı uygulanarak termogravimetrik

analizi (TGA) yapıldı. TGA sonuçları incelendiğinde, ısıtma hızı artışı ile polimerin termal kararlılığının daha

yüksek olduğu sonucuna varıldı. Polimerin termal bozunma aktivasyon enerjisi Flynn-Wall-Ozawa metoduna göre

155.01 kJ mol-1 ve Kissinger metoduna göre ise 165.29 kJ mol-1 olarak hesaplandı. Polimerin termal bozunma

mekanizmasını belirlemek amacıyla Coats-Redfern kinetik metodu kullanıldı. Elde edilen kinetik veriler ışığında

polimerin termal bozunma mekanizmasının optimum 10 °C dak-1 ısıtma hızında D1 tek boyutlu difüzyon tipi

yavaşlama mekanizması üzerinden ilerlediği belirlendi.

Anahtar Kelimeler

Aktivasyon enerjisi, kumarin türevli polimer, termal bozunma kinetiği, termal bozunma mekanizması

Kaynakça

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