Abstract
In the present work, pyrolysis kinetic mechanism was studied for regenerated cellulosic fiber (RCF) and composite RCF containing silicon/nitrogen flame retardants. Limited oxygen index and microscale combustion calorimeter tests show that the loading of nitrogen/silicon into the RCF enhanced flame retardancy. The kinetic triplets of the two kinds of samples were determined by applying iso-conversional methods and integral master plots approach. Compared to the untreated RCF, flame retardant (FR) treated RCF shows enhanced activation energy due to the physical barrier layer due to dehydration of silicate and charring effect resulting from organic–inorganic interaction. Exponential nucleation model can be successful in describing experimental results for RCF in higher conversion degree (0.4–0.9). Simultaneously, the degradation process of FR treated RCF in the main pyrolysis stage (0.2–0.7) is consistent with kinetics of nuclei growth and could be described by one-step reaction whose rate presented an Avrami–Erofeev-type model (n = 2.38).
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