关键词: 多孔介质, 烷烃, 相变材料, 定形相变材料, 相变砂浆, 热力学性质

Abstract: A kind of shape-stabilized phase change materials(SPCMs) was prepared by soaking absorbing technology with octadecane as phase change materials(PCMs) and expanded perlite as supportive material. The PCMs and SPCMs were characterized by DSC，FT-IR and ESEM. The surface of the SPCMs were packaged tentatively by the technology of wet-wrapping cement dry powder in order to reduce the possibility of melting leakage of PCMs in the cement matrix. The holding ratio of the octadecane absorbed in expanded perlite increased from 75 percent to above 97 percent after surface packaging SPCMs which were baked under 60℃ for continuous 20 hours. The heat-insulating property experiment results show that the lower surface time delay and the maximum temperature difference are 230 s，4.2℃ and 500s，6.2℃ respectively for 10mm thickness and 15mm thickness mortar board with 40 percent by weight of sand in the reference mortar mixture replaced by packaged SPCMs，compared to those of same thickness reference mortar board the form—stable phase change materials wrapped by cement，baked for 20 hours under 60℃，and absorption rate changes from 75% to 97% after packing. The lower surface time delay and the maximum temperature difference of 15mm thickness phase change mortar board still have 360s and 4.3℃ after experiencing 25 thermocycling.

Key words: porous media, alkane, phase change materials, shape-stabilized phase change materials, phase change mortar, thermodynamic properties