Thermal properties of AlN (nano) filled LDPE composites

The thermal properties of aluminium nitride nano-particles (n-AlN) filled into low-density polyethylene (LDPE) are discussed. Cylindrical specimens were prepared using a melt mixing process. X-ray diffraction was performed to characterize the structural properties of the pellets under investigation. The X-ray diffraction analysis confirms the change in secondary structure, such as crystallinity, of the LDPE due to the dispersion of n-AlN powder. The thermal stability of pure and n-AlN filled LDPE was checked by performing thermo-gravimetric analysis. The analysis confirms an improvement in the thermal stability of LDPE due to n-AlN addition. The thermal conductivity of the samples was measured using a KD2 Pro device (based on the transient hot wire technique of thermal conductivity measurement) at room temperature. Our finding reveals similar to 1.36 fold enhancement in the effective thermal conductivity of LDPE due to the addition of 15 vol.% of n-AlN. The room-temperature thermal conductivity data of the investigated pellets were analyzed as a function of n-AlN concentration in the light of available theoretical models and correlations. The variation in thermal conductivity data of LDPE with n-AlN concentration is well explained by the semi-empirical model proposed by Agari and Uno.