Oxythermography for exploring the thermal stability of polymer materials: a novel analytical approach

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Abstract

The control of oxygen and carbon dioxide concentrations in an airflow released from a reactor, in which a sample is heated, can be used to investigate the thermal stability of polymer materials. This approach, known as oxithermography, involves analyzing experimental data (oxithermograms), representing the variation in oxygen concentration decrease and carbon dioxide appearance in an airflow with changing temperature conditions. This method allows for monitoring the effect of fillers introduced into polymer compositions on their thermal stability. The application of oxithermography to studying oxidative thermostability is demonstrated using pure polypropylene and polypropylene with titanium dioxide admixtures as examples.

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About the authors

B. K. Zuev

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Email: smile_mail@mail.ru
Russian Federation, 119991, Moscow

A. E. Zaitseva

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Email: smile_mail@mail.ru
Russian Federation, 119991, Moscow

A. S. Korotkov

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Email: smile_mail@mail.ru
Russian Federation, 119991, Moscow

V. G. Filonenko

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Email: smile_mail@mail.ru
Russian Federation, 119991, Moscow

I. V. Rogovaya

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Author for correspondence.
Email: smile_mail@mail.ru
Russian Federation, 119991, Moscow

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Supplementary files

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2. Fig. 1. Scheme of an experimental oxithermographic installation for the study of polymer samples by oxithermography. 1 – quartz boat, 2 – thermocouple, 3 – quartz boat insertion unit into the reactor, 4 – inlet to the temperature reactor, 5 – quartz high–temperature reactor, 6 – heating element, 7 – exhaust gas oxidation catalyst, 8 - thermocouple controlling reactor heating, 9 – oxygen sensor, 10 – carbon dioxide sensor gas, 11 – rotameter, 12 – air flow stimulators, 13 – control unit and experimental data collection, 14 – personal computer.

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3. Fig. 2. Time scans of the coordinates of the boat (1) and the surface temperature of the boat with the sample (2), used to form the temperature profile of heating samples when studying the thermal degradation of samples of initial polypropylene (PP) and polypropylene with titanium dioxide additives.

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4. Fig. 3. Change in oxygen content (relative units) in the air stream leaving the reactor, depending on time for samples of pure polypropylene (PP) and with a content of 1, 2 and 5% TiO2.

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5. Fig. 4. Change in the carbon dioxide content (relative units) in the air stream leaving the reactor, depending on time for samples of pure polypropylene (PP) and with a content of 1, 2 and 5% TiO2.

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6. Fig. 5. Change in oxygen content (relative units) in the air stream leaving the reactor, depending on the heating temperature for samples of pure polypropylene (PP) and with a content of 1, 2 and 5% TiO2.

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7. Fig. 6. Change in the carbon dioxide content (relative units) in the air stream leaving the reactor, depending on the heating temperature for samples of pure polypropylene (PP) and with a content of 1, 2 and 5% TiO2.

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8. Fig. 7. Curve characterizing oxygen consumption as a function of temperature during the thermal degradation of polypropylene with the addition of 5% TiO2. The dotted line shows a straight line approximating the leading edge.

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9. Fig. 8

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10. Scheme 1

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