Study on a PEG/epoxy shape-stabilized phase change material: Preparation, thermal properties and thermal storage performance

In this work, PEG based SSPCMs were successfully prepared using 9,10-dihydro-9-oxa-10-phosphaphe nanthrene-10-oxide (DOPO) modified epoxy resins as reliable supporting materials in the absence of solvent. The encapsulated PEG acted as phase change functional domains and DOPO was used to enhance the thermal stability of polymeric SSPCMs. The chemical composition and microstructure of prepared SSPCMs were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). X-ray diffraction (XRD), differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) were conducted to investigate the crystalline properties, phase change properties and thermal stability of SSPCMs. Heat storage and release performance test was conducted to certify the reversible heat storage and release performance of SSPCMs. Thermal cycling test was also performed to illustrate the thermal reliability of SSPCMs. From DSC results, the prepared SSPCMs melted at 67.7 degrees C and crystallized at 27.9 degrees C and the corresponding latent heat are 112.0 J/g and 108.0 J/g, respectively. TG results showed that SSPCMs have good thermal stability with the onset decomposition temperature far beyond their working temperature. (C) 2018 Elsevier Ltd. All rights reserved.