ALBR3 IMPACT ON THE THERMAL DEGRADATION OF P (S-CO-MMA): A STUDY PERFORMED BY CONTEMPORARY TECHNIQUES

摘要: Pyrolysis of copolymer, [P(S-co-MMA)], in the presence AlBr3 was inspected an inert atmosphere. Five different proportions (copolymer/additive) were chosen. Films cast from common solvent. It noticed that copolymer showed more stability on basis T 0, however, regions also observed for blends. Copolymer 0 at 260 °C, whereas blends started degrading around 70 °C. max same and Low-temperature decompositions attributed to generation free radicals (Br•) zones stabilizations assigned formation a “complex type” structure between Al carbonyl oxygens MMA units. Degradation products collected identified employing Py-GC–MS technique. Intermediates (solid) temperatures (300, 350 400 °C) examined through FTIR spectroscopy. In light gathered data, degradation mechanism proposed. New encountered, viz., bromobenzene, ‘brominated’ anhydride ring, etc., which established chemical interactions constituents blends, i.e., additive. Anhydride rings absent when poly (methyl methacrylate) pyrolyzed AlBr3. Oligomers styrene not found hinting involvement additive “targeting” The indicate 2–7% residue original mass; exhibits 9% while does leave completion TG run. char residues suggests imparts copolymer. Horizontal burning rate lowest (6 times less than neat copolymer) [P(S-co-MMA):AlBr3, 87.5:12.5%], thereby revealing efficiency as thermal stabilizer. highest activation energy calculated (169.46 kJ/mol) range this parameter 52.72 27.14 kJ/mol.