改性正十八烷相变纳米胶囊制备表征及在太阳能建筑中的应用

Phase change nanocapusules are combine with traditional building envelope materials，which can improve the heat collection and temperature control performance of traditional passive solar buildings through non-mechanized energy storage，thereby realizing indoor energy conservation. Organic modified SiO2@C18 nanocapusules with different nucleators （Nano- Al2O3/C28/C14H30O） were synthesized effectively via the microemulsion polymerization method and the gypsum boards containing phase change nanocapusules were prepared by casting method. The chemical structure and appearance of nanocapusules were determined by FT-IR，XRD，and SEM. The thermal properties were investigated by DSC，TGA and LFA. Principal thermal performances of gypsum boards containing the optimal NEPCMs were measured systematically. The results demonstrates that the phase change nanocapusules are spherical in size range of 100~300 nm. Compared with the NEPCMs without nucleating agents，the NEPCMs containing 15% C14H30O has a superior performance with the supercooling degree reduced by 49.00% and thermal conductivity increases by 13.76%. Meanwhile，its exhibites outstanding thermal durability and reliability. Therefore，contents of 15%C14H30O NEPCMs is added to the gypsum board. Through the temperature difference evaluation, it is founded that gypsum board with 10% NEPCMs is more conducive to absorbing external heat fully，reducing indoor temperature fluctuation and achieving a superb energy-saving effect in passive solar building.