纳米碳化硅改善CPS/PAN相变复合纤维膜的传热速率

以不同质量比例的聚丙烯腈/纳米碳化硅(PAN/SiC)复合纤维膜为支撑材料,以癸酸-棕榈酸-硬脂酸(CPS)三元低共熔物为固-液相变材料,通过物理吸附法制备CPS/PAN/SiC定形相变复合纤维膜。分别采用扫描电子显微镜(SEM)、差示扫描量热仪(DSC)和传热测试装置研究不同含量纳米SiC对定形相变复合纤维膜的形貌特征、储热性能、热能储存和释放速率的影响。SEM图像显示负载不同含量纳米SiC对CPS/PAN/SiC定形相变复合纤维膜的形貌结构没有显著影响。DSC测试结果表明随着支撑纤维膜中SiC颗粒含量的增加,定形相变复合纤维膜的相变温度和相变焓值没有明显变化。根据传热测试数据显示随着纳米SiC含量的增加,定形相变复合纤维膜的融化与结晶时间显著缩短了约20%~46%。

Improvement of thermal transferrates of the CPS/PAN phase change composite fibrous membranes by carborundum nanoparticles

The composite fibrous membranes consisting of polyacrylonirtile(PAN)and carborundum nanoparticles(SiC)with the different mass ratios were used as supporting materials.The capric-palmitic-stearic acid(CPS)was selected as solid-liquid phase change materials.And then the CPS/PAN/SiC form-stable phase change composite fibrous membranes(PCCFMs)were developed by physical adsorption method.The scanning electron microscopy(SEM),differential scanning calorimetry(DSC)and heat transfer test measurement were used to determine morphology,thermal performance,heat storage and release rates of the form-stable PCCFMs loading different mass ratios of SiC,respectively.The SEM images reveal that there was no significant influence on the morphological structure of the CPS/PAN/SiC form-stable PCCFMs by loading different content of SiC.The DSC results show that the SiC additives had no significant impact on the phase transition temperatures and enthalpies of the prepared PCCFMs with the increasing of SiC amounts.According to the data of heat transfer measurement,the melting and freezing time of form-stable PCCFMs were significantly shortened by about 20-46%with the SiC content increasing.