Determination of activation energy during the thermal degradation of Polyamide 66/glass fiber composites

Abstract

The objective of this study was to clarify the mechanical properties and the non-isothermal degradation kinetics of Polyamide 66 (PA 66)/glass fiber (GF) composites. The non-isothermal degradation behavior of the samples was studied by thermal gravimetric analysis under nitrogen purge. The perfect compatibility of GFs with polymer matrix in composites was studied by scanning electron microscopy. It was found that with increasing content of GFs in samples due to good distribution of fibers in PA 66, the degradation temperature and calculated activation energy in composites increased in all heating rates. The activation energy was calculated by the Flynn–Wall–Ozawa method (isoconversional method). It was concluded that the model-free methods can be a reliable way to determine the kinetic parameters. Furthermore, the isokinetic relationship was used to estimate a model-independent pre-exponential factor (ln A) corresponding to a given degree of conversion.

Sustainable Basalt Fibers vs. Traditional Glass Fibers: Comparative Study on Thermal Properties and Flow Behavior of Polyamide 66-Based Composites

“…Ea here evaluated for neat PA 66 was slightly higher, but comparable, with the values reported in literature of 80-114 kJ/mol [32,37,38] (in all cases heating rate was 10 °C/min). Azimi and Abedifard found an activation energy of 200 kJ/mol, for PA 66 composites containing 10 wt.% of GF [38].…”

“…Ea here evaluated for neat PA 66 was slightly higher, but comparable, with the values reported in literature of 80-114 kJ/mol [32,37,38] (in all cases heating rate was 10 °C/min). Azimi and Abedifard found an activation energy of 200 kJ/mol, for PA 66 composites containing 10 wt.% of GF [38]. E a here evaluated for neat PA 66 was slightly higher, but comparable, with the values reported in literature of 80-114 kJ/mol [32,37,38] (in all cases heating rate was 10 • C/min).…”

Prediction of Thermal Behavior of Polycarbonate/Cerium Oxide Composite Films

“…Furthermore, it has been demonstrated that CeO 2 could act as a char-like insulator reducing both heat transfer and burning rate [22]. Although it is well known that the decomposition kinetics of linear PC depends on the selected temperature range [23,24], there is a lack of evidence about the influence of cerium oxide (ceria) NPs on its thermal behavior.…”