Abstract
Perhydropolysilazane (PHPS), a ceramic precursor resin with outstanding high-temperature resistance, was used as the shell material to prepare novel sodium nitrate microcapsules (MCP-NaNO3) for high-temperature thermal energy storage. The microstructure and thermal properties of the MCP-NaNO3 were investigated by DSC-TG, SEM, FTIR, EDS, etc. The MCP-NaNO3 presented a melting point of 306.19±0.10℃ and latent heat of 159.2±2.4J/g. The MCP-NaNO3 had a thin shell, and the weight percentage of NaNO3 in the MCP-NaNO3 was calculated to be about 85wt%. The melting point of MCP-NaNO3 almost had no change, and the supercooling of MCP-NaNO3 only had a small increase of about 2.69℃ compared with that of NaNO3. The thermal decomposition temperature of NaNO3 in the MCP-NaNO3 was enhanced more than 36℃, up to 647.60℃. The PHPS shell was able to ensure the MCP-NaNO3 to be still granular after heated at 350℃, and the melting point and freezing point of the MCP-NaNO3 were almost invariable. The MCP-NaNO3 developed in this study has great promise in future energy and chemical processes. The method that using ceramic precursor resins as microcapsule shells paves a new way to prepare various high-temperature phase change microcapsules.
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