膨胀石墨基定型相变材料的性能研究

Study on Properties of Expanded Graphite Shape-stabilized Phase Change Materials

采用熔融共混法制备了癸酸/膨胀石墨定型相变材料(DA/EG-PCMs)、月桂酸/膨胀石墨定型相变材料(LA/EG-PCMs)和石蜡/膨胀石墨定型相变材料(PA/EG-PCMs),利用接触角测量仪、FT-IR、DSC、TG-DSC和热渗出实验分别对三种膨胀石墨基定型相变材料的亲疏水性、特征基团、热性能、热稳定性和耐久性进行表征。结果表明:膨胀石墨能很好的将癸酸、月桂酸和石蜡吸附住,三种相变材料与膨胀石墨之间仅存在物理结合作用。DA/EG-PCMs和LA/EG-PCMs都表现出亲水的特性,PA/EG-PCMs疏水。在膨胀石墨的高导热网络结构包覆下,三种膨胀石墨基定型相变材料相变温度提前,耐久性提高,DA/EG-PCMs与LA/EG-PCMs的热稳定降低,PA/EG-PCMs热稳定提高。

Decanoic acid/expanded graphite shape-stabilized phase change materials（DA/EG-PCMs）,lauric acid/ expanded graphite phase change materials, （LA/EG-PCMs） and paraffin/expanded graphite phase change materials（PA/EG-PCMs） were prepared by melt-blending method. Hydrophily and hydrophobicity, characteristic functional group, thermal properties, thermal stability and durability of expanded graphite based shape-stabilized phase change material were tested by contact angle apparatus, FT-IR,DSC,TG-DSC and thermal effusion experiment. The results show that expanded graphite can absorb decanoic acid, lauric acid and paraffin well, there is only the physical binding between expanded graphite and three kinds of phase change materials. DA/EG-PCMs and LA/EG-PCMs present hydrophilic performance, but PA/EG-PCMs are hydrophobic. With coating of high conductivity network of expanded graphite, phase change temperature of three kinds of expanded graphite based phase change materials diminish, and their durability enhances. The thermal stability of DA/EG-PCMs and LA/EG-PCMs decreases, while the thermal stability of PA/EG-PCMs increases.