Study On Tuning Thermal Properties Of Phase Change Materials On Neopentyl Glycol And Meso-Erythritol

With the increasing energy needs, traditional fossil fuels become fewer and fewer. how to utilize efficiently energy source, have alreadly become a important focus that people concerned about. Phase change materials as a kind of new energy-storaging materials will be widely applied in many saving energy field.Neopentyl glycol(NPG) and meso-erythritol(ME) are used as phase change energy storge materials, which have good performances and properties with good chemical stability, high phase change latent heat, no poison and no pollution compared with traditional phase change materials. Controlled pore glass(CPG) and silica gel(SG) are a kind of mesoporous materials with uniform pore size distribution. There are many special properties with solids in hole compared with conventional solids owe to small size effect, surface and interface effect. In this study, CPG and SG act as porous media, NPG and ME serve as latent heat storage materials, the main work of this study is as follow:(1) Based on solution impregnation method and porous materials' adsorption of solution, we have prepared NPG/CPG composites(d = 11.5–300 nm), ME/CPG composites(d = 11.5–107.6 nm) and ME/SG composites(d = 9.8–100 nm).(2) Phase behaviors of NPG/CPG, ME/CPG and ME/SG composites are investigated using differential scanning calorimetry(DSC). We can obtain their phase transition temperatures and latent heats. According to data analysis, temperature and latent heats decrease as the pore size becomes smaller.(3) 10-time thermal cycling of NPG/CPG composites(d = 11.5–300 nm) are investigated using DSC. We can obtain their supercooling and good chemical stability. Supercooling in the solid transition increases with the decreasing pore diameter.(4) We characterize the structure and thermodynamic properties of NPG/CPG, ME/CPG and ME/SG composites by SEM, XRD and TG in this work. We can draw a conclusion that structure and thermodynamic properties of NPG and ME embedded in CPG and SG are same as bulk, which proves that the interaction between NPG, ME and CPG, SG are physical.