سينتيك تخريب حرارتي پلي استايرن و پلي متيل متاكريلات

Thermal Degradation Kinetics of PS and PMMA

In this work, the thermal degradation (pyrolysis) kine tic of polymers was studied. Attention was focused on the thermal pyro lysis of polymethylmethacry late (PMMA) and po lysty rene (PS) as two thermop lastic po lymers, Thermogravimetric (TG) analysis is a basic method for kinetic analysis calculations. Diffe rent analy tical methods such as Flynn -Wall-Ozawa, Friedman, Kissinger and Coats-Redfern were used to determine the triplet kinetic parameters. Conseq uently the best kinetics model f or two po lymers was proposed and the simulated kinet ics curves based on the determined kinetics parameters were compared to the exper imental TG curves. invest igati on on thermal degradation ofpolystyrene shows that random chain scission, unzipping and intermolecular transition react ions are the most dominant mechanisms. Thermal degradation ofPMMA progresses at differe nt steps in which the most unstable step, initiates with head to head bounds cleavage .