Friedman and n-reaction order methods applied to pine needles and polyurethane thermal decompositions

摘要

The Friedman method is applied to two processes: flexible polyurethane foam (PU) pyrolysis and pine needle combustion, considering two types of runs: dynamic and dynamic + isothermal. In both cases, the TG and DTG runs are taken into account. For both materials, the Friedman method is applied twice: one considering only the dynamic runs and the other considering all runs, dynamic and dynamic + isothermal runs. Different expressions for fitting the variation of the apparent activation energy and the pre-exponential function have been obtained and used to simulate the experimental results.