关键词: 脂肪酸, SiO₂, 复合材料, 湿性能, 核-壳比

Abstract:  With binary fatty acid as phase change material, SiO₂ as carrier material, according to different core-shell ratio, made binary fatty acid/SiO₂ composite materials by sol-gel method. Humidity performance of binary fatty acid/SiO₂ composite materials were tested, composition structure, microstructure and particle size distribution were characterized. The results showed that under the action of surface tension and capillary, binary fatty acid wrapped in SiO₂ network space structure. While binary fatty acid content was 0.06 mol, binary fatty acid/SiO₂ composite materials had the best humidity performance, such as equilibrium moisture content was 0.1297~0.1775 g/g and equilibration time is 31~46 min in the relative humidity of 40%~60%. SiO₂ has rich "cage" structure, not only package and bound binary fatty acids, but also adsorption in the environment of water molecules. Binary fatty acid/SiO₂ composite materials d₁₀ was 148.54 nm, d₅₀ was 254.73 nm and d₉₀ was 452.73 nm.

Key words: fatty acid, SiO₂, composite materials, humidity property, core-shell ratio