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Detailed kinetic analysis of slow and fast pyrolysis of poly(methyl methacrylate)-Flame retardant mixtures
Date Issued
01-05-2020
Author(s)
Jayarama Krishna, J. V.
Srivatsa Kumar, Sai
Korobeinichev, O. P.
Indian Institute of Technology, Madras
Abstract
In this study, thermal decomposition kinetics of poly(methylmethacrylate) (PMMA) is investigated in the presence of a phosphorus-based flame retardant (Exolit®) under slow and fast pyrolysis conditions. Multi-Gaussian distributed activation energy model (DAEM) is employed to determine the kinetic parameters at slow heating rates. The multi-Gaussian DAEM with five parallel independent reactions predicts well the experimental mass loss and differential mass loss profiles. The incorporation of 3 and 5 wt.% Exolit® in PMMA delays the decomposition temperature and slows down the rate of PMMA pyrolysis. Isothermal fast pyrolysis is carried out in the temperature range of 400−700 °C at short time intervals of 2−150 s. The rate constant of decomposition of PMMA + 5 wt.% Exolit® mixture was lower than that for pure PMMA. Through analytical pyrolysis coupled with Fourier transform infrared spectroscopy it is shown that the addition of Exolit® to PMMA significantly delays the evolution of methylmethacrylate, which is the major pyrolysate.
Volume
687