The kinetics of thermal degradation of PA6 composites containing intumescent flame retardant and inorganic additive was studied by using various model-free methods such as Flynn-Wall-Ozawa, Kissinger, Coats-Redfern Modified and model-based Coats-Redfern method at three heating rates 5, 10 and 20 oC/min under nitrogen atmosphere. Model-free methods suggested the simple reaction mechanism for pure PA6 and complex multistep mechanism for flame retarded PA6 composites. The activation energy values obtained from three model-free methods were comparable to each other. Model-based Coats-Redfern method suggested the random nucleation and growth mechanism for both PA6 and PA6/AP760 samples but the degradation mechanism is changed to phase boundary controlled mechanism on further addition of inorganic additives. The change of activation energy values indicated that inorganic additives acted as catalyst during major degradation stage but at later stage of charring they acted as strong barriers to prevent escaping of volatile materials.
Cite this article:
Sweety Monga, J. B. Dahiya. Kinetic study of non-isothermal degradation of PA6 composites containing flame retardant additives. Asian J. Research Chem. 8(11): November 2015; Page 683-689. doi: 10.5958/0974-4150.2015.00109.1