PEG/SiO_2定形相变材料在沥青及水泥环境中应用的可行性

Applied exploration of shape-stabilized polyethylene glycol/silicon dioxide composites as phase change materials in asphalt and cement environment

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。

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/Si02 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 FF-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.