Pirazol Temelli Yeni Bir Kopolimerin [poli(1,3-difenil-1H-pirazol-5-il metakrilat-ko-stiren)] Termal Bozunma Kinetiği

Year 2022, Volume: 22 Issue: 3, 517 - 527, 30.06.2022

Adnan Kurt Murat Koca

https://doi.org/10.35414/akufemubid.1114247

Abstract

Mevcut çalışmada, pirazol sübstitüe gruplu 1,3-difenil-1H-pirazol-5-il metakrilat (DPMA) ve stiren (St) birimlerini içeren yeni bir kopolimer [poli(DPMA-ko-St)] sentezlenmiş ve kopolimer sisteminin termal bozunma kinetiği termogravimetrik analiz (TGA) tekniği ile detaylıca araştırılmıştır. Isıtma hızındaki değişime bağlı olarak (5 °C/dak – 20 °C/dak) kopolimerin termal stabilitesinde 252,02 °C'den 274,89 °C'ye bir artış gözlemlenmiştir. Kopolimerin termal bozunma aktivasyon enerjileri, %9 - %21 dönüşüm aralığında, Kissinger ve Flynn-Wall-Ozawa yöntemleri ile sırasıyla 149,37 kJ/mol ve 140,99 kJ/mol olarak sonuçlanmıştır. Coats-Redfern, Tang, Madhusudanan ve Van Krevelen gibi farklı kinetik metotlar ışığında kopolimerin termal bozunma mekanizması incelenmiştir. Elde edilen sonuçlar kopolimerin termal bozunma mekanizmasının özellikle Coats-Redfern metoduna göre 20 °C/dak optimum ısıtma hızında tek boyutlu difüzyon tipi bir yavaşlama mekanizması yani D1 mekanizması üzerinden ilerlediğini göstermiştir.

Keywords

Pirazol, Stiren, Kopolimer, Termal bozunma kinetiği, Aktivasyon enerjisi, Reaksiyon mekanizması

Thermal Degradation Kinetics of a Novel Pyrazole Based Copolymer [poly(1,3-diphenyl-1H-pyrazol-5-yl methacrylate-co-styrene)]

Abstract

In the present study, a new copolymer containing pyrazole substituted 1,3-diphenyl-1H-pyrazol-5-yl methacrylate (DPMA) and styrene (St) units, [poly(DPMA-co-St)], was synthesized. Thermal degradation kinetics of the copolymer system was investigated in detail with the thermogravimetric analysis (TGA) technique. An increase in the thermal stability of the copolymer from 252.02 °C to 274.89 °C was observed depending on the change in heating rate (5 °C/min – 20 °C/min). The thermal degradation activation energies of the copolymer were 149.37 kJ/mol and 140.99 kJ/mol, respectively, with the Kissinger and Flynn-Wall-Ozawa methods in the conversion range of 9% - 21%. The thermal degradation mechanism of the copolymer was investigated in the light of different kinetic methods such as Coats-Redfern, Tang, Madhusudanan, Van-Krevelen and Horowitz-Metzger. The results showed that the thermal decomposition mechanism of the copolymer proceeds through a one-dimensional diffusion-type deceleration mechanism, namely the D1 mechanism, at the optimum heating rate of 20 °C/min, especially according to the Coats-Redfern method.

Keywords

Pyrazole, Styrene, Copolymer, Thermal decomposition kinetics, Activation energy, Reaction mechanism

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