Kinetics of thermal decomposition of polymethylmethacrylate in a carbon dioxide environment

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Abstract

A thermogravimetric analysis of the thermal decomposition of polymethylmethacrylate (PMMA) in a carbon dioxide flow was carried out. The kinetic constants of the process were determined. The heating rate of the sample varied over a wide range and amounted to 2, 5, 8, 20, 35 and 50 K/min. The values of the kinetic constants of PMMA decomposition were determined using the isoconversional method. For the degree of conversion of the substance from 10 to 90%, the values of activation energy for the thermal decomposition of PMMA vary in the range from 213.5 to 194.3 kJ/mol, and the values of the pre-exponential coefficient change in the range from 1.62 ⋅ 1016 to 6.85 ⋅ 1012 1/s. The average activation energy for the thermal decomposition of PMMA in a carbon dioxide flow was 206 kJ/mol.

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About the authors

E. A. Salgansky

FRC of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Author for correspondence.
Email: sea@icp.ac.ru
Russian Federation, Chernogolovka

M. V. Salganskaya

FRC of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: sea@icp.ac.ru
Russian Federation, Chernogolovka

D. O. Glushkov

National Research Tomsk Polytechnic University

Email: sea@icp.ac.ru
Russian Federation, Tomsk

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Supplementary files

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2. Fig. 1. Curves of mass change in the process of thermal decomposition of PMMA at different heating rates of samples in a carbon dioxide environment. Numbers are heating rates (K/min).

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3. Fig. 2. Curves of the dependence ln(β/T 2) = f (1/T) for different values ​​of the degree of conversion of the sample (a).

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4. Fig. 3. Curve of the dependence of the activation energy of thermal decomposition of PMMA on the degree of sample conversion.

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5. Fig. 4. Curves of the logarithmic dependence of the rate constant of the chemical reaction of thermal decomposition of PMMA for different values ​​of the degree of sample conversion. Numbers are the degrees of sample conversion (%).

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