中文摘要：

将正癸酸（DA）、月桂酸（LA）和硬脂酸（SA）熔融共混制备了三元体系相变材料（DA-LA-SA）,以DA-LA-SA为相变材料,膨胀石墨（EG）为载体材料,用熔融共混法制备不同DA-LA-SA含量的三元低共熔脂肪酸/膨胀石墨复合相变材料（DA-LASA/EG-PCMs）。采用FT-IR、XRD、SEM、TGA和DSC对其组成成分、晶体结构、微观形貌、相变温度和相变焓进行表征。结果表明,当DA、LA和SA的质量配比为1∶8∶1时,DA-LA-SA具有较低的相变温度和较高的相变焓;EG由大量的微孔构成,通过微孔束缚和表面吸附与DA-LA-SA物理结合,具有良好的稳定性;EG质量分数为10%时,所制备的DA-LA-SA/EG-PCMs三元相变体系复合相变材料的相变温度为38.6℃,相变焓为123J/g,导热系数为3.572 1 W·（m·K）^-1,分散均匀,颗粒粒径较小,具有优良的热性能和稳定性。

英文摘要：

A ternary composite phase change material system （DA LA-SA） was prepared by blending decanoic acid （DA）, lauric acid （LA） and stearic acid （SA）. Then a series of fatty acid eutectic mixture/expanded graphite composite phase change materials （DA-LA-SA/EG-PCMs） were prepared with DA-LA-SA as phase change component and expanded graphite （EG） as carrier component, by melt blending method. The composition, crystal structure, microstructure, phase transition temperature and enthalpy of DA I.A SA/EG-PCMs were characterized by FTIR, XRD, SEM, TGA and DSC. The results showed that when the mass ratio of DA/LA/SA was 1 ： 8 ： 1, DA-LA-SA had low phase transition temperature and high phase change enthalpy. EG was composed of numberous pores, and the DA-LA SA/EG-PCMs with physical combination of EG and DA-LA-SA had good stability through the mi-croporous bound and surface adsorption of EG. When the content of EG was 10wt%, the phase change temperature, enthalpy and thermal conductivity were 38. 6℃, 123 J/g, and 3. 572 1 W·（m·K）^-1,respectively, accompanied with a uniform dispersion and small particle size, as well as excellent thermal performance and stability.