Charge dynamics and thermal properties of epoxy based micro and nano hybrid composites at high temperatures

This paper presents the effects of the filler type and testing temperature on the charge dynamics and thermal properties of the epoxy resin. The micro-nano hybrid composites with different content of the micro and nano aluminum nitride (AlN) fillers are fabricated. The morphology of micro-nano hybrid composites is characterized. Electrical testing and thermal analysis methods are adopted to analyze its electrical and thermal performance. The results show that the space charge accumulation is suppressed and the charge decay process is facilitated in the hybrid composites. The electrical performances of the hybrid composites are enhanced by the nano-fillers. The apparent mobility and activation energy are decreased with nano-AlN fillers in the composites at the high temperature. The glass transition temperature and thermal stability of the materials is improved with the nano-AlN. A hypothetical mechanism is proposed to explain the charge carrier injection and transport of the composites at different temperatures.

Automated summary

This study investigates the effects of different micro and nano AlN fillers on the electrical performances and thermal properties of hybrid composites at high temperatures. The results show that nano-fillers enhance the electrical performances but decrease the apparent mobility and activation energy of the composites. Additionally, a hypothetical mechanism is proposed to explain the charge carrier injection and transport of the composites at different temperatures.