以水玻璃为硅源，采用化学沉淀-微波加热法制备了Na₂SO₄·10H₂O@SiO₂相变微胶囊。利用FT-IR、XRD、SEM、TEM、DSC对Na₂SO₄·10H₂O@SiO₂相变微胶囊进行了分析与表征，同时考察了乳化剂配比、芯壁比、微波加热功率、酸浓度对相变微胶囊形貌和热性能的影响。结果表明，十水合硫酸钠与二氧化硅之间仅存在物理相互作用，制备的微胶囊具有球状核壳结构；当微胶囊的芯壁比为1：0.5、微波加热功率为260 W、酸浓度为4 mol/L时，制得的相变微胶囊潜热值最大。因芯材和壁材廉价易得、无毒害，该相变微胶囊有望应用于建筑节能领域。

Na₂SO₄·10H₂O@SiO₂,a microencapsulated phase change material,is successfully fabricated via chemical precipitation combined with microwave heating method by using sodium sulfafe decahydrate as core and sodium silicate as a precursor silica shell.FT-IR and XRD results show that there is only a physical interaction between sodium decahydrate and silica.SEM and TEM results show that the microcapsules have a spherical core-shell structure.DSC analysis shows that the microencapsulated phase change material has the maximum latent heat as the core-shell ratio is 1:0.5,the microwave heating power is 260W and the acid concentration of 4 mol·L^-1.The effects of emulsifier ratio on the morphology of microencapsulated phase change material,the effects of core-wall ratio,microwave heating power and acid concentration on the latent heat of that are studied.Due to the availability of core materials and wall materials,which are inexpensive and non-toxic,the microencapsulated phase change material is expected to be applied in the field of energy conservation for buildings.

李开红(1988-),男,硕士研究生,主要从事无机相变材料的研究,763868520@qq.com