Abstract: In this paper, the thermal-oxidative aging effects on the thermal oxidation behaviors and thermal degradation kine-tics of flame retardant short-glass-fiber reinforced PA10T composites (PA10T/GF/FR) were investigated with different aging temperatures of 160 ℃, 200 ℃ and 240 ℃ for 0—50 days. The static and dynamic mechanical properties, microstructure and thermal degradation behaviors were investigated by using mechanical properties analysis, DMA, SEM and TGA,respectively. Kissinger and Flynn-Wall-Ozawa methods were utilized to calculate the thermal degradation activation energy of PA10T/GF/FR.The results de-monstrated that during thermal-oxidative aging the molecular weight of PA10T resin declined and the interfacial properties between fiber and matrix deteriorated, resulting in the decrease of mechanical properties. The micro-crosslinking reaction happened during 160 ℃ aging process and thus storage modulus increased as well as glass transition temperature (Tg). However, the molecular degradation dominated in the later phase of 200 ℃ and 240 ℃ aging,which resulted in the Tg increase first and decrease after. The calculation of activation energy exhibited that the thermal stability of the 50 d aged sample at 160 ℃ was improved, while after 50 d aging at 200 ℃ or 30 d at 240 ℃, the composite structure was destroyed seriously, and the thermal degradation behaviors changed significantly. What’s more, the flame retardant can enhance the thermal stability of aged samples.
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2018, Vol. 32 
