ABSTRACT
Owing to the excellent adsorptive performance of porous silica, polyethylene glycol/silicon dioxide Shape-Stabilized Phase Change Materials (PEG/SiO2 SSPCM) were prepared using sol-gel method by impregnating different doses of PEG into the pore structure of silicon dioxide gel. And Asphalt-shape-stabilized phase change materials blends (Asphalt-SSPCM) with different PEG doses were prepared by melt blending method. The pore structure of silicon dioxide and morphology of PEG/SiO2 SSPCM were characterized by porosity analyzing instrument and Scanning Electron Microscope (SEM); the crystal structure, heat storage property and heat stability of PEG/SiO2 SSPCM in asphalt were studied by X-Ray Powder Diffraction (XRD) and synthesized thermal analyzer (DSC/TG). The results showed that silicon dioxide had porous microstructure with high surface area and energy, which can absorb PEG. PEG crystal structure still existed in Asphalt-SSPCM, and the heat storage ability of Asphalt-SSPCM increased with increasing PEG dose in the blends, the enthalpy of the blends was 117.5 J/g with PEG 76.1 wt%, and the blends with different doses of PEG all showed favorable heat stability. Moreover, the heat storage principle of Asphalt-SSPCM was analyzed based on the phase change theory.
