碳/SiO_2纳米纤维膜基定形相变材料的制备及性能

Preparation and property of form-stable phase change materials based on C/SiO_2 nanofibrous mats

研究首先制得二元脂肪酸低共熔物,然后将用静电纺丝法制备不同SiO2含量的、并对其进行炭化的PAN/SiO2纳米纤维膜作为支撑材料,吸附二元脂肪酸低共熔物制得碳/SiO2纳米纤维膜基定形相变材料(CSNPCM),利用扫描电子显微镜(SEM)、差示扫描量热仪(DSC)等对制备出的定形相变材料的形貌结构和储热性能进行分析和表征。随着SiO2含量的增加,定形相变材料对二元脂肪酸低共熔物的吸附容量有所降低。SEM结果表明,二元脂肪酸低共熔物均匀地包埋、分散在多孔纳米纤维膜的三维网络结构中。DSC测试结果表明,SiO2的加入降低了定形相变材料的相变潜热,对其相变温度无太大影响。

Firstly,binary fatty acid eutectics were prepared by melt blending and ultrasonic dispersion technique in this research,then the PAN/SiO2 nanofibrous mats with different content of SiO2 prepared by using electro-spinning method,which after carbonization were taken as supporting materials.The form-stable phase change materials based on C/SiO2 nanofibrous mats (CSNPCM)were fabricated by adsorbing binary fatty acid eutec-tics.The structural morphologies and thermal energy storage properties of form-stable phase change materials were characterized by scanning electron microscope (SEM)and differential scanning calorimeter (DSC),respec-tively.With the increase of SiO2 ,the adsorption capacity of binary fatty acid eutectics in turn reduce.SEM re-sults show that binary fatty acid eutectics embeded and dispersed evenly in the three dimensional network struc-ture of porous nanofibrous mats.DSC results show that the addition of SiO2 decrease the phase change latent heat of form-stable phase change materials,whereas there are no appreciable changes on the phase transition temperatures.