首先采用磁控溅射法在静电纺聚氨酯(PU)纤维膜表面沉积纳米银(Ag)导热金属薄膜,并将其作为支撑材料,通过物理吸附法吸附癸酸-月桂酸-肉豆蔻酸-棕榈酸四元低共熔物(CA-LA-MA-PA),制备出新型的CA-LA-MA-PA/PU/Ag定型相变复合纤维膜.EDX测试结果显示Ag纳米颗粒已经被成功地沉积到静电纺PU纤维膜上.SEM图像显示经过磁控溅射后静电纺PU纤维的直径明显增加,CA-LA-MA-PA四元低共熔物被均匀地吸附到PU和PU/Ag纤维膜的孔隙结构中.热分析结果表明CA-LA-MA-PA/PU/Ag定型相变复合纤维膜的融化温度和融化焓值分别为17 ℃和94.81 kJ/kg.与CA-LA-MA-PA/PU定型相变复合纤维膜相比较,CA-LA-MA-PA/PU/Ag定型相变复合纤维膜的储热和放热时间分别缩短了约42%和24%.
The Ag nanolayers with the higher thermal conductivity were coated on the surface of electrospun PU fiber membranes by magnetron sputter.The novel form-stable phase change composite fiber membranes were prepared by adsorbing the CA-LA-MA-PA quaternary fatty acid eutectic into electrospun PU and PU/Ag fiber membranes serving as supporting materials by physical adsorption method.EDX spectra suggests that the Ag nanoparticles are successfully covered on the surface of electrospun PU fiber membranes.SEM images illustrate that the average fiber diameter of electrospun PU fibers significantly increased after sputter coating.The CA-LA-MA-PA quaternary eutectics are uniformly dispersed into the porous network structure of electrospun PU and PU/Ag fiber membranes.DSC analyses indicate that the melting temperature and enthalpy of the CA-LA-MA-PA/PU/Ag form-stable phase change composite fiber membranes are 17 ℃ and 94.81 kJ/kg, respectively.The heat storage and release times of CA-LA-MA-PA/PU/Ag form-stable phase change composite fiber membranes are shortened by about 42% and 24% compared to those of the CA-LA-MA-PA/PU form-stable phase change composite fiber membranes.
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