聚乙二醇/石墨烯复合相变电热膜的制备与性能

Preparation and Performance of Polyethylene Glycol/Graphene Composite Phase Change Electric Heating Film

文中采用价格低廉的多层石墨烯(MLG)为导电填料,潜热较高的聚乙二醇(PEG)相变材料为基体,通过溶液共混法制备了具有良好电热性能的复合相变电热膜。通过扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)、X射线衍射仪(XRD)、差示扫描量热分析(DSC)、热重分析(TGA)、升降温实验等分析了相变电热材料的表面形貌、结构性能、相变焓、热稳定性和电热性能。SEM结果表明,MLG与PEG基体中分散较好,并在PEG中构建了MLG杂化网络,其中MLG提供了导热路径,并限制了PEG在相变过程中的泄漏。FT-IR和XRD结果表明,在制备过程中,PEG与MLG之间没有发生化学反应,但PEG的结晶度有所降低。DSC和TGA分析表明,MLG质量分数为7%时,该复合相变材料相变焓为164J/g,开始热失重温度为300℃左右。升降温实验表明电热膜具有可靠的温度调节性能,3gPEG/MLG(7%)样品在20V电压下可升温至91.3℃,并且能在相变温度65℃附近保温280s以上。

Energy-saving materials are nowadays research hotspots.In this paper,electrothermal films with good electrical properties were prepared by solution blending using multilayer graphene(MLG)with low cost as conductive filler and polyethylene glycol(PEG)with excellent latent heat performance as substrate.The surface morphology,structural properties,phase change enthalpy,thermal stability and electrothermal properties of the phase change electrothermal materials were analyzed by SEM,FT-IR,XRD,DSC,TGA and elevated temperature experiments.The SEM results show that the MLG is better dispersed in the PEG matrix and the MLG hybridization network is constructed in PEG,in which MLG provides the thermal conductivity path and limits the leakage of PEG during phase change process.The FT-IR and XRD results show that there is no chemical reaction between PEG and MLG during preparation process,but with the crystallinity of PEG reduced.And the DSC and TGA analysis show that the enthalpy of phase transition of the composite phase change material is 164 J/g at 7%MLG content,and the onset of heat loss temperature is about 300℃.The temperature rise and fall experiments show that the electric heating film has reliable temperature regulation performance,and the 3 g PEG/MLG(7%)sample can be heated up to 91.3℃at 20 V,and it can be held for more than 280 s near the phase transition temperature of 65℃.