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Keywords
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Polyamide 66/glass fiber, degradation kinetics, scanning electron microscopy,
isoconversional method, isokinetic relationship method
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Abstract
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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 nonisothermal
degradation behavior of the samples was studied by thermal gravimetric analysis
under nitrogen purge.The perfect compatibility of GFswith 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 (lnA) corresponding to a given degree of conversion.
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