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

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.