A series of novel form-stable phase change materials (FSPCMs) were fabricated by employing palmitic acid (PA) as latent heat storage units,polyolefin elastomer (POE) and hollow mesoporous silica (SiO2) microspheres as limiter to confine the PA in small nanometer-scale spacing so that the leakage during phase transition can be circumvented.The morphology,structure,and thermal properties of the prepared FSPCMs were analyzed by scanning electron microscope (SEM),transmission electron microscopy (TEM),X-ray diffraction (XRD),Fourier-transform infrared (FT-IR) spectra,thermogravimetric analyses (TGA) and differential scanning calorimeter (DSC).The results indicated that the SiO2 improved the structural stability of the composite FSPCMs.PA was tightly imprisoned in the skeletons assembled by POE and SiO2.and no leakage was detected during the phase change process.The melting enthalpies and freezing enthalpies were 143.9J/g and 147.6J/g,respectively,when the mass fraction of SiO2 was up to 5%.Meanwhile,the prepared FSPCMs exhibited outstanding thermal cycling reliability during the multiple thermal cycling tests.
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基金资助
国家自然科学基金(52002190)
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