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-LA-SA/EG-PCMs).采用FTIR、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128 J/g,导热系数为3.572 1W· (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.
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-LA-SA/EG-PCMs were characterized by FT-IR,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 microporous 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.
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