十六醇-十六酸-十二酸/SiO_2三元相变体系复合材料的热湿性能

以十六醇(H)-十六酸(PA)-十二酸(LA)为相变材料,SiO_2为载体材料,采用溶胶-凝胶法制备不同HPA-LA用量的H-PA-LA/SiO_2三元相变体系复合材料。采用等温吸放湿法和步冷曲线法对H-PA-LA/SiO_2三元相变体系复合材料的湿性能和热性能进行测试,同时利用FTIR、XRD、SEM、LPSA和DSC对H-PA-LA/SiO_2三元相变体系复合材料的组成结构、晶体结构、微观形貌、粒径分布、相变温度和相变焓进行表征。结果表明:当HPA-LA用量为0.06mol时,所制备的H-PA-LA/SiO_2三元相变体系复合材料在人体舒适度范围内具有良好的热湿综合性能,即相对湿度为40%~65%时,平衡含湿量为0.07~0.10g/g,相变温度为26.29℃,相变焓为70.55J/g。

Heat-moisture performance of hexadecanol-palmitic acid-lauric acid/SiO2 ternary phase change system composites

H-PA-LA/SiO₂ ternary phase change system composites were prepared with hexadecanol (H)-palmitic acid (PA)-lauric acid (LA) as a phase change material, SiO₂ as the carrie material by sol-gel method by different amounts of H-PA-LA. The moisture performance and heat performance of H-PA-LA/SiO₂ ternary phase change system composites were tested by isothermal sorption moisture method and cooling curve method, meanwhile composition structure, crystal structure, microstructure, size distribution, phase transition temperature and phase transition enthalpy of H-PA-LA/SiO₂ ternary phase change system composites were characterized by FTIR, XRD, SEM, LPSA and DSC. The results show that while H-PA-LA content is 0.06 mol, prepared H-PA-LA/SiO₂ ternary phase change system composites have the best heat-moisture comprehensive performance in the range of human comfort, such as equilibrium moisture content is 0.07-0.10 g/g, phase change temperature is 26.29℃, phase change enthalpy is 70.55 J/g in relative humidity 40%-65%.