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Kinetics of linear polymer thermal depolymerization under isothermal and dynamic TGA modes was simulated by the Monte Carlo method. The simulation was carried out on model arrays having the same initial degree of polymerization and different width (polydispersity index, ) at three constant temperatures and five heating rates. Kinetics of the process in both modes is described by the Avrami equation, the exponent in which decreasing as the distribution width increases. Treatment of the model kinetic curves of degradation using the nonlinear regression method by the Avrami equation, under both isothermal and dynamic modes, gives correct activation energy and pre-exponential factor values independently of the initial PDI. Data obtained in the dynamic mode were also treated by two isoconversion methods, widely applied to kinetic analysis of TGA curves (Flynn-Wall-Ozawa method and Kissinger-Akahira-Sunose (KAS) method).

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Purpose-The presented topic relevance is conditioned by the fact that experts in the physical culture field are experiencing problems in the course of work in a poly-ethnic educational organization that reduces their professional activities effectiveness, the timely identification of which will optimize the process of teachers' professional education. Methodology-The goal is to identify the most significant problems of young and experienced teachers' activity on physical culture in a poly-ethnic educational organization. The study leading method on this topic is to monitor the health environment in a poly-ethnic educational organization, which includes interview, analysis, observation and data graphical interpretation. Findings-The paper presents the study results of teachers' professional activity problems on physical education in a poly-ethnic educational organization, the positions of undergraduates-interns, young and experienced teachers regarding the identified problems solution are considered. Significance-The materials can be used to organize specialists' modular training on physical culture to work in poly-ethnic educational organizations within the framework of secondary vocational, higher and additional professional education.