Construction of high thermal conductive boron Nitrid@Chitosan aerogel/ paraffin composite phase change material

The utilization of aerogel with the 3D network structure is regarded as an important method to construct phase change materials (PCMs). In this work, a series of novel paraffin-based composite PCMs were fabricated with boron [email protected] aerogel (BNCA) as skeleton materials by a freeze-drying and impregnation method. XRD, SEM, TGA, Hot Disk, DSC and FT-IR were used to character the samples and thermal cycles were employed to measure the shape stability. The results revealed that paraffin wax (PW) had been successful and effectively embedded into the prepared BNCA with a porous structure. Moreover, the morphologies of BNCA/PW composite remained stable after 100 times thermal cycles. In addition, the thermal conductivity of BNCA/PW composite was notably high as 1.14 W/(m·K), which was 4.07 times higher than PW (0.28 W/(m·K)). Simultaneously, the phase temperatures of BNCA/PW composite containing 41 wt% skeleton were 50.5 and 52.9 °C, and its latent heats were 118.4 and 114.9 J/g, respectively. The BNCA/PW composite showed an excellent chemical compatibility between PW and BNCA, and presented broad application prospects in energy storage of electronic systems.