泡沫炭基储能传感复合材料的制备研究

Preparation of carbonaceous foam based energystorage and sensing composite

以生物质淀粉烧制泡沫炭为基本骨架,以聚吡咯为导热、导电材料,以无机和有机混合相变材料为储能介质,构建具有传感功能的相变复合材料,使相变复合材料的温度变化能够实时地以电信号的形式给出。本文探讨了不同分子量PEG及其用量对复合材料储能和传感性能的影响。电阻-温度-时间关系的测试结果表明CF-PPy-PCM-1000-1,CF-PPy-PCM-8000-0,CF-PPy-PCM-20000-0传感功能较好。DSC测试结果显示CF-PPy-PCM-8000-0的熔融焓值为113.29 J/g,CF-PPy-PCM-20000-0的熔融焓值为124.44 J/g,二者具有作为相变储能材料的潜能。SEM图像表明,负载PCM后,PCM附着在CF-PPy骨架的孔泡壁上。尽管从PCM的填充情况看,还有进一步提升其负载量的空间,但这种非全面填充的状态也在一定程度上保证了复合材料在储热过程中不会出现相变材料的渗出泄露的问题。

In the present study,a phase change composite with sensing function was constructed by using starch-derived carbonaceous foam(CF)as skeleton,polypyrrole(PPy)as conductor of heat and electrons,and inorganic and organic mixed phase change materials(PCM)as energy storage media.The temperature change of the phase change composite can be given in the form of an electrical signal in real time.The effects of the amount of PEG with different molecular weights on the energy storage and sensing properties of the composites were investigated.The results of the resistance-temperature-time relationship indicate that CF-PPy-PCM-1000-1,CF-PPy-PCM-8000-0,and CF-PPy-PCM-20000-0 show better sensing performance.The DSC results show that the melting enthalpy of CF-PPy-PCM-8000-0 was 113.29 J/g,and the melting enthalpy of CF-PPy-PCM-20000-0 was 124.44 J/g,both of which had the potential to be applied as phase change energy storage materials.The SEM images show that the PCM adhered to the cell walls of the CF-PPy skeleton.Although there was room for the further increase of the load of PCM,this incomplete filling also ensured that the phase change component in the composite did not leak during the heat storage process to some extent.