聚乙二醇/膨胀石墨/聚丙烯复合相变材料的制备及表征

Preparation and properties of composite polyethylene glycol /expanded graphite /polypropylene phase-change material

以膨胀石墨(EG)为基体,聚乙二醇(PEG)为相变储热介质,利用EG对PEG良好的吸附性能,制备了PEG/EG/聚丙烯(PP)复合相变材料。采用傅里叶变换红外光谱(FT-IR)、扫描电镜(SEM)、差示扫描量热分析(DSC)等方法对复合相变材料的结构、形貌和热性能进行了表征。结果表明:EG吸附PEG后仍然保持原有疏松多孔的形态,PEG被EG均匀吸附。由于毛细管作用力和表面的物理化学吸附作用,PEG在固-液相变时很难从微孔中渗透出来。复合相变材料的流变、形态和热性能较好时PEG/EG/PP的质量比为73.2/1.8/25.0。

With expanded graphite（EG） as a matrix and polyethylene glycol（PEG） as a phase-change/ thermal energy storage material, PEG/EG/polypropylene （PP） composite phase change material was prepared by utilizing the good adsorbability of EG to PEG. The structure, morphology, and thermal properties of the composite phase change material were characterized by means of FT-IR, SEM and DSC. It is shown that PEG can be uniformly absorbed into the pore network of EG, and EG remains its vermiform structure in PCMs. Because of the effect of capillary force and surface tension force, polyethylene glycol was very difficult to leak out from the pores when solid-liquid phase change happened. The PEG/EG/PP composite with good rheological, morphological and thermal properties was obtained when their ratio is 73.2/1.8/25.0 in order.