PEG/APS-SiO2/O-CNTs导热增强相变材料的制备及性能

reparation and properties of PEG/APS-SiO2/O-CNTs phase change energy storage materials with enhanced thermal conductivity

摘要:

以聚乙二醇(PEG)为相变材料，以3-氨丙基三乙氧基硅烷（APS）改性的二氧化硅(SiO2)为支撑材料，以氧化壁碳纳米管(O-CNTs)为导热增强材料，采用溶胶-凝胶法成功制备了PEG/APS-SiO2/O-CNTs导热增强型复合相变材料。通过FTIR、XRD、SEM、DSC等对材料的结构和热性能进行了表征。当PEG含量为82.0%时，复合相变材料仍然具有良好定型效果，熔化焓和结晶焓达到134.2 J/g、126.6 J/g，而且材料具有很好的储热稳定性，300次热循环后，其储热焓值仅下降3.3%。相比于纯PEG，添加了0.6%的O-CNTs的复合相变材料的导热增强率为28.1%, 达到0.41W/(m?K)。红外热成像结果表明，复合相变材料的储能效率明显提高。

Abstract:

Phase change material composite with enhanced thermal conductivity were synthesized by sol-gel method using polyethylene glycol (PEG) as phase change material, 3-aminopropyl triethoxy grafted silicon dioxide (SiO2) as supporting material and oxide carbon nanotube(O-CNTs) as thermal conductivity reinforcer. The structure and morphology of PEG/APS-SiO2/O-CNTs composite were characterized by FTIR, SEM,XRD and DSC. When PEG content was 82.0%, the composite PCM still had good form-stable effect, and the enthalpy of melting and crystallization reached 134.2J/g and 126.6J/g. More importantly, the PEG/SAM composite retained good thermal properties after 500 melting and cooling cycles, the enthalpy decreased by only 3.3%. Compared with the PEG, the thermal conductivity enhancement rate of the composite with 0.6% O-CNTs was 28.1%，up to 0.41 W/(m?K). The infrared thermal imaging results show that the energy storage efficiency of the composite phase change materials is obviously improved.