【摘要】 针对适用于建筑领域的相变储能材料,选用癸酸(CA)分别与月桂酸(LA)、肉豆蔻酸(MA)和棕榈酸(PA)复合制备了二元低共熔脂肪酸作为储能材料。通过施罗德公式计算得到二元低共熔脂肪酸的混合比例和理论相变温度。基于CA-MA优异的性能,采用溶胶-凝胶法制备CA-MA/SiO2定形相变储能材料。采用FT-IR、SEM、DSC、TG对CA-MA/SiO2的结构、形貌、热性能和热稳定性进行了分析。结果表明,制备的3种二元低共熔脂肪酸适合于建筑领域。CA-MA较好地被固定在SiO2多孔网络中,储能材料和SiO2之间仅为物理结合,没有新物质的生成。定形相变储能材料的相变温度为20.96℃,相变焓为70.17J/g,相变温度适中,相变焓高,热稳定性好。更多还原

【Abstract】 In order to prepare shape-stabilized phase change energy storage materials which were applied to control temperature of building materials,capric acid was mixed separately with lauric acid,myristic acid and palmitic acid to prepare binary fatty acid eutectic mixtures.The phase transition temperature of binary fatty acid and its corresponding mixing proportion are calculated based on Schroder equation.Shape-stabilized CA-MA/SiO2 composite phase change materials were prepared using sol-gel methods.The structure,microstructure,thermal properties and thermal stability of composite materials were characterized by infrared spectroscope,scanning electronic microscope,differential scanning calorimeter and thermogravimetric analysis apparatus,respectively.It was shown that as prepared binary fatty acid had an appropriate temperature and latent heat which can be applied in building field.The CA-MA was well dispersed in the porous network of SiO2,and there was no chemical interaction between CA-MA and SiO2.The melting temperature and melting latent heat of the composite phase change materials is 20.96℃ and 70.17J/g,respectively,and composite materials have good thermal stability.So the composite materials were considered as an effective latent heat thermal energy storage materials in building energy conservation.更多还原