Kinetics of the oxidative decomposition of potato-starch-g-poly(phenyl methacrylate) copolymers

摘要: Abstract The simultaneous TG-DSC-FTIR techniques were applied to study the thermo-oxidation of starch-g-poly(phenyl methacrylate) copolymers, using unmodified potato starch in order compare results. shows that degradation copolymers takes place three large stages, between 150 and 600 °C. main evolved volatile compounds were: H 2 O, CO CO, addition a mixture organic products. kinetic analysis suggests initial from all (between 245 250 °C) starts through scheme reversible reaction, followed by an irreversible one, where progressive decreasing E(α) values, ∼200 kJ mol −1 up ∼150 kJ mol , reveals auto-catalytic influence intermediary on overall reaction rate. Subsequently, for α > 0.4 temperatures higher than 300 °C, with values 55 150 kJ mol complex set competitive reactions linked secondary graft both, mechanism parameters are highly dependent conversion. For 400 °C α > 0.7, direct gasification carbonaceous residues occurs at least two different energetic significant changes conversion dependence whose magnitudes extents copolymer samples.