▎ 摘　　要

Composite phase-change materials (CPM) were prepared using polyethylene glycol (PG), polyvinyl butyral (PB) and graphene nanoplates (GP). PG is a phase-change material (PM), PB is used as supporting material, and GP is an additive with high thermal conductivity. The results of Fourier transformation infrared spectroscope (FT-IR) and X-ray diffractometer (XRD) show that there is no chemical reaction among the PB, PG and GP. The CPM was observed with a laminar structure by scanning electronic microscope (SEM). Differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA) and transient hot-wire conductivity meter were used to measure thermal performance of the CPM. The experimental results indicate that CPM3 has best thermal performance. The CPM3 containing 5 wt% GP has thermal conductivity of 2.04 W/(m.K), 8.87 times that of pure PG. The melting temperature and latent heat of the CPM3 are 58.75 degrees C and 147.81 J/g. Thermal cycling experiments demonstrate the CPM3 possesses good thermal reliability. Therefore, it has application prospects in solar energy utilization, building energy conservation and waste heat recovery.