棕榈酸-十六醇/二氧化硅相变储能材料的低热固相合成与表征

Synthesis and Characterization of Palmitic Acid-hexadecanol/SiO_2 Phase Change Energy Storage Materials by Solid-state Chemical Reaction at Low Temperature

以棕榈酸-十六醇(PA-HD)低共熔物为相变材料,硅酸钠为硅源,通过低热固相化学合成方法制备出棕榈酸-十六醇/二氧化硅相变储能材料(PA-HD/SiO2)。利用FT-IR,ESEM,DSC,融化-凝固曲线测试对材料的结构、形貌和性能进行表征。结果表明:当相变材料与硅酸钠质量比为2∶1时可实现相变材料的有效包覆,PA-HD/SiO2相变焓值和相变温度分别为102.35J·g-1和53.69℃,该定形复合相变材料具有良好的传热性能,因为包覆作用,使得相变材料的相变温度有所升高。

Palmitic acidhexadecanol/silicon dioxide （PA-HD/SiO2） phase change energy storage materials were prepared by low-temperature solid-state reaction using the eutectic mixture of palmitic acid and hexadecanol（PA-HD） as phase change component and sodium silicate as silicon source. The structure, morphology, and thermal performance of the composite were characterized by Fourier transform infrared spectrometer （FT-IR）, environmental scanning electron microscopy （ESEM）, differential scanning calorimetry （DSC）, and the test of melting and solidification process. The results show that when the ratio of mass fraction between phase change component and sodium silicate is 2, the eutectic mixture of palmitic acid and hexadecanol are effectively imbedded into the net of silicon dioxide by low- temperature solid-state reaction. The latent heat and melting temperature of the composite are 102.35J·g-1 and 53.69℃, respectively, and the composite has good thermal conductivity. Furthermore,the phase transition temperature of the eutectic mixture is improved owing to the coating effect of silicon dioxide.