二氧化硅包覆芒硝基相变储能微胶囊制备及性能表征

Preparation and Characterization of Silica Coated Glauber’s Salt-Based Microencapsulated Phase Change Materials

将四乙氧基硅烷(TEOS)和3-氨丙基三乙氧基硅烷(APTES)作为硅源,芒硝基相变储能微胶囊作为芯材,通过乳液聚合的方法制备了二氧化硅包覆的芒硝基相变储能微胶囊。测得芒硝基相变储能微胶囊的熔化焓和凝固焓分别为136.4 J/g和76.9 J/g,融化和凝固温度分别为23.6℃和17.6℃。微胶囊的核-壳结构减轻了无机水合盐固液分离程度,抑制了相分层现象的发生。在100次循环后,熔化焓为64.3 J/g,具有较好的循环稳定性,可用于热能存储等领域。

Silica coated Glauber’s salt-based microcapsuled phase change materials were prepared by emulsion polymerization,using Tetraethoxysilane(TEOS)and 3-aminopropyltriethoxysilane(APTES)as the silicon source,Glauber’s salt-based microcapsuled phase change materials as core materials.The melting and solidifying enthalpy of the microcapsules are measured as 136.4 J/g and 76.9 J/g,respectively,with associated temperatures of 23.6℃and 17.6℃.The core-shell structure of the microcapsules reduces the degree of solid-liquid separation of inorganic hydrated salts and suppresses the occurrence of phase stratification.After 100 cycles,the enthalpy of melting is 64.3 J/g,which has good cycle stability and can be used in fields such as thermal energy storage.