导热增强聚乙二醇相变复合材料的制备及其性能

Properties of Thermal Conductivity Enhanced Polyethylene Glycol-Based Phase Change Composites

本文以聚乙二醇(PEG)为相变材料,通过添加不同的无机填料,采用熔融共混浇筑方式制备了导热增强型相变复合材料。通过扫描电子显微镜(SEM)、热常数分析仪、差示扫描量热仪(DSC)、红外热成像和热重分析仪研究了所制备复合材料的微观结构、导热性能与相变过程。研究结果表明,相比于碳酸钙和氧化铝,在相同添加含量下,氮化硼(BN)可有效提高PEG的导热系数,当BN质量分数为40%时,导热系数可达到3.40 W/(m·K);当填料添加量相同时,片状BN和不规则纳米碳酸钙(CaCO 3)比球形氧化铝(Al 2 O 3)对PEG具有更加优良的定型效果,在相变过程中,能够更加有效阻隔PEG的流动,保持复合材料的形状稳定性。

In this study,thermally conductive phase change composites materials was prepared based on polyethylene glycol(PEG)and inorganic fillers via the molten blending method.The microstructure,thermal conductivity and phase transition performance of the prepared composites were investigated by scanning electronic microscopy(SEM),thermal constant analyzer,differential scanning calorimetry(DSC),infrared thermal imaging and thermogravimetric analysis.The results show that,compared with calcium carbonate and alumina,boron nitride can more significantly improve the thermal conductivity of PEG at the same mass fraction.When the mass fraction of BN is 40%,the thermal conductivity of composites can reach 3.40 W/(m·K).Simultaneously,flake boron nitride can effectively limit the leakage of PEG and maintain the initially shapes well upon long time heating,and maintain the shape stability of the composite.