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Asian Journal of Research in Chemistry
Year : 2015, Volume : 8, Issue : 11
First page : ( 683) Last page : ( 689)
Print ISSN : 0974-4169. Online ISSN : 0974-4150.
Article DOI : 10.5958/0974-4150.2015.00109.1

Kinetic study of non-isothermal degradation of PA6 composites containing flame retardant additives

Monga Sweety, Dahiya J. B.*

Department of Chemistry, Guru Jambheshwar University of Science & Technology, Hisar-125001, Haryana, India

*Corresponding Author E-mail: jbdic@yahoo.com

Online published on 31 December, 2015.

Abstract

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°C/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.

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Keywords

Polyamide 6, Degradation mechanism, Flame retardants, Coats-Redfern method.

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