RESEARCH OF THE KINETICS OF PYROLYSIS OF CROSS-LINKED POLYETHYLENE AND HDPE
This paper presents a study of the kinetics of the process of thermal degradation of polymers. The pyrolysis process of high-pressure polyethylene and cross-linked polyethylene was studied by thermogravimetry. To determine the kinetic model of destruction and Arrhenius parameters, the samples were decomposed at different heating rates (2.5, 5, and 10 K / min). During the simulation of the pyrolysis process, the most adequate model was determined: thermal degradation includes two consecutive stages with autocatalysis at the first stage. The activation energies of polyethylene degradation were 111 and 91 kJ/mol for the first and second stages, respectively. In the case of cross-linked polyethylene - 175 and 308 kJ/mol.