摘要:
以SiO2为载体, 癸酸-棕榈酸为相变材料, 采用溶胶-凝胶法制备了癸酸-棕榈酸/SiO2相变储湿复合材料, 利用等温吸放湿法、步冷曲线法、FTIR、SEM、激光粒度分析仪(LPSA)、BET、TGA和DSC等对其进行性能测试和表征。结果表明: 癸酸-棕榈酸/SiO2相变储湿复合材料的载体材料SiO2具有"笼"结构, 其大量微孔形成三维空间网格结构既可以通过癸酸-棕榈酸与SiO2的物理嵌合方式包裹与束缚相变材料, 又可以通过SiO2的亲水性能吸附水分子, 具有良好的热湿性能。癸酸-棕榈酸/SiO2相变储湿复合材料表面光滑圆润无明显凹陷, 颗粒粒径较小且均匀性较好(粒径为82.14 nm、孔体积为0.010 7 mL/g、孔比表面积为25.16 m2/g、孔平均直径为26.63 nm), 属于纳米级有机相变芯材/无机基体复合材料; 相变温度为19.88~23.13 ℃、相变潜热为38.55~42.56 J/g, 癸酸-棕榈酸的质量分数约为31.59%, 满足人体舒适度的温度范围, 适合在建筑领域中广泛应用。
Abstract:
With SiO2 as the carrier, decanoic acid-palmitic acid as phase change material, decanoic acid-palmitic acid/SiO2 phase change and humidity storage composites were prepared by sol-gel method. The performance were tested and characterized by using isothermal moisture adsorption and desorption method, cooling curve method, FTIR, SEM, laser particle size analyzer(LPSA), BET, TGA and DSC etc. The results show that carrier material SiO2 of decanoic acid-palmitic acid/SiO2 phase change and humidity storage composites with cage structure have a large number of microporous forming 3D space grid structure. It can both package and constraint with phase change materials by physical chimeric way of decanoic acid-palmitic acid and SiO2, and adsorb water molecules by hydrophilic properties of SiO2. It has good heat-moisture property. Decanoic acid-palmitic acid/SiO2 phase change and humidity storage composites have smooth surface with no obvious depression, particle size is small and has good uniformity (particle size is 82.14 nm, micropore volume is 0.010 7 mL/g, micropore specific surface area is 25.16 m2/g, micropore average diameter is 26.63 nm),and it belongs to nanoscale organic phase change core material/inorganic matrix composite; phase change temperature is 19.88-23.13 ℃, phase change latent heat is 38.55-42.56 J/g, mass fraction of decanoic acid-palmitic acid is about 31.59%, it meets the comfort of the human body temperature range and is suitable for widely use in construction field.
百度学术
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