Non-isothermal degradation kinetics of MMA-St copolymer and EPS lost foams

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• 作者：Hamid Reza Azimi ; Mostafa Rezaei ; Farhang Abbasi ; Ali Charchi ; Yahya Bahluli
• 关键词：Lost foam ; MMA-St copolymer ; EPS ; Degradation kinetics
• 刊名：Thermochimica Acta
• 出版年：2008
• 出版时间：15 August 2008
• 年：2008
• 卷：474
• 期：1-2
• 页码：72-77
• 全文大小：277 K

文摘

Methylmethacrylate-styrene (MMA-St) random copolymer was synthesized by suspension copolymerization. The thermal degradation of MMA-St copolymer and EPS lost foams was studied by non-isothermal thermal gravimetric analysis under nitrogen purge. Thermal decomposition behavior of MMA-St copolymer lost foam was examined and compared with EPS. It was found that EPS foam starts to decompose at higher temperatures than MMA-St copolymer foam in all heating rates. The apparent activation energy was calculated by the Flynn-Wall-Ozawa method. It has been concluded that the model fitting methods unable to reveal the complexity of the pyrolysis process and the model-free methods can be suggested as a reliable way of determining the kinetic parameters.