作　　者： (李琳）; (李东旭）; (张树鹏）; (王立国）;

机构地区： 南京工业大学材料科学与工程学院,南京210009

出　　处： 《材料研究学报》 2017年第8期591-596,共6页

摘　　要： 以癸酸(CA)、月桂酸(LA)、肉豆蔻酸(MA)和棕榈酸(PA)为相变材料并根据理论公式估算低共熔脂肪酸的组成配比和理论热性能,制备了4组三元低共熔脂肪酸。针对适用于夏炎热地区建筑领域的相变储能材料,选取月桂酸-肉豆蔻酸-棕榈酸(LA-MA-PA)为相变芯材,用溶胶-凝胶法制备了LA-MA-PA/SiO_2复合相变材料,并测试了这种复合相变材料的结构和性能。结果表明:LA-MA-PA具有良好的热稳定性和结构稳定性,可均匀地嵌入到SiO_2多孔网络结构中,且相变芯材与载体复合后无新物质生成。LA-MA-PA/SiO_2球体颗粒光滑饱满,分散性良好其粒径约为3μm,经历100次热循环后脂肪酸没有明显的渗漏。这种复合相变材料的相变温度和潜热分别为29.6℃和91.1 J/g,具有良好的热稳定性。 With capric acid（CA）, lauric acid（LA）, palmitic acid（PA）, and myristic acid（MA） as raw materials, four kinds of ternary eutectic mixtures were prepared in consideration of the theoretical thermal property of the formed mixtures with the mass ratio of the three selected raw materials. Then LA-MA-PA/SiO2 composite phase change materials were prepared by sol-gel method and their structure and performance were characterized. The results show that LA-MA-PA was uniformly filled into the three-dimensional network of SiO2 and there was no chemical reaction between LA-MA-PA and SiO2. LA-MA-PA/SiO2 presented as smooth spherical particles with 3 μm in diameter, which exhibit smooth surface and good dispersibility.While the LA-MA-PA/SiO2 exhibited high-performance in energy storage with little leakage even after 100 thermal cycling. The phase change temperature and latent heat of the LA-MA-PA/SiO2 were determined to be29.6℃ and 91.1 J/g.

关 键 词： 无机非金属材料 低共熔脂肪酸 溶胶 凝胶法 二氧化硅 复合相变材料