Abstract
Halloysite nanotubes (HNTs) have become one kind of promising supporting material for composite phase change materials (PCMs) owing to their nanostructure, the hollow tubule structure, and high surface area. In the present study, a novel solid-solid phase change material (SSPCM) was prepared based on polyethylene glycol as the soft segment and HNTs as the rigid segment through the two-step polymerization method. As a result, the prepared SSPCMs possess a steady crosslinking structure, and the SSPCMs own good crystallization properties. The SSPCM (PEG, 86.5 wt %) has high phase change enthalpy (tm is 56.49 ℃, ΔHendo is 149.0 J/g) and good crystallinity of 89.1%. Moreover, the TGA results reveal that the SSPCMx has good thermal reliability. Besides, hexagonal boron nitride (h-BN) and graphite powder (GP) were added into the system to optimize the thermal transfer properties, and the thermal conductivities of synthesized SSPCMs can be enhanced 59.0% as compared with that of pure PEG which is 0.196 W/(m K). It can be concluded that the SSPCMs possesses not only excellent phase change properties but also outstanding thermal reliability and a fast thermal response rate. Herein, the synthesized SSPCM displays the promising potential for thermal energy storage application.
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