PEG/SiO2定形相变材料在沥青及水泥环境中应用的可行性

摘要

Based on physical blend methods,asphalt or cement shape-stabilized phase change materials composites (CPCMs) were prepared by polyethylene glycol/silicon dioxide shape-stabilized phase change materials (PEG/SiO2 ss-PCMs) and asphalt or cement.Thermal energy storage and thermal stability of CPCMs are characterized using synthesized thermal analyzer,and the chemical compatibility of CPCMs is characterized using FT-IR.The feasibility of ss-PCMs applied to asphalt and cement environment was explored.The results showed that CPCMs had high phase change enthalpy,good thermal stability and chemical compatibility.Ss-PCMs can be used in road to achieve solar energy conversion or storage and actively control pavement temperature,and this is a more effective way of reducing pavement surface temperature and temperature diseases in high temperature conditions and at the same time,relieving urban heat island effect,therefore,ss-PCMs have broad application foregrounds in road engineering.%以聚乙二醇/二氧化硅(PEG/SiO2)定形相变材料与沥青、水泥为原料,采用物理共混法制备出沥青或水泥复合定形相变材料.利用综合热分析仪(TG-DSC)测试复合相变材料的储热性能及热稳定性,通过FT-IR对复合相变材料的兼容性进行了表征,探讨PEG/SiO2定形相变材料在沥青、水泥环境中应用的可行性.试验表明,复合定形相变材料具有较高的相变焓,良好的热稳定性和兼容性.将PEG/SiO2定形相变材料应用于公路工程中,可实现太阳能量转换与储存,主动调节路面的使用温度,并在高温条件下可有效降低路表温度,减少温度对路面的病害,缓解城市热岛效应,改善人居环境,其应用前景广阔.