Abstract: Microencapsulated phase change materials（MEPCMs）can effectively prevent the leakage and erosion of phase change material during the melting phase change process，which has broad industrial applications in heat storage and temperature regulation. Herein，novel microencapsulated phase change energy-storing materials were prepared by in-situ polymerization using hydrophobic-aluminum oxide （H-Al₂O₃） modified 1-tetradecanol（TD） as core and melamine-urea-formaldehyde （MUF） resin as shell material. The effects of H-Al₂O₃ dosage on morphology and thermal properties of phase change microcapsules were investigated. The prepared modified microcapsules were characterized by Fourier transformation infrared spectroscope（FTIR），scanning electron microscopy/energy dispersive X-ray spectroscopy， differential scanning calorimeter， thermogravimetric analyzer，and multi-channel temperature inspection instrument. The results showed that the prepared MEPCMs with H-Al₂O₃ had a compact surface and spherical shape. When the weight content of H-Al₂O₃（relative to TD）was 4%，the highest encapsulation ratio of the modified MEPCMs could reach 76. 29% and the melting enthalpy was measured as 165. 4 J/g. The thermal stability and temperature control performance of the tetradecanol microcapsules were also improved due to high thermal conductive nano-Al₂O₃.

Key words: 1-tetradecanol, nano-Al₂O₃, microencapsulated phase change materials, in situ polymerization, thermal properties