METHOD FOR MAKING A PEG PHASE CHANGE COMPOSITE

摘要

A heat energy storage system may have a shape-stabilized composite prepared using an easy impregnation method involving a porous Ca²⁺-doped MgCO₃ matrix and PEG as the functional phase. The heat storage capability, microstructures, and interactions with the PEG/CaMgCO₃ composite can be characterized by DSC, SEM imaging, FT-IR spectroscopy, and TGA. Likely because of the synergistic phase change effect of CaMgCO₃ and PEG, the PEG/CaMgCO₃ composites can have high thermal enthalpies, and their enthalpy efficiencies are substantially higher than those of traditional shape stabilized PCMs. The functional material PEG can permeate porous CaMgCO₃ matrices under capillary action. Liquid PEG can be stabilized within the porous matrix, and/or the CaMgCO₃ matrix can improve the thermal stability of the PEG. The high heat energy storage properties and good thermal stability of such organic-inorganic composites offers utility in a range of applications, including thermal energy storage.