Phase change microcapsules were prepared by solvent evaporation method using a binary phase change material of tetradecane-octanoic acid as the core material and polysulfone modified with nano titanium dioxide (TiO2) as the wall material.The influence of different amounts of nano TiO2 on the performance of the microcapsules was investigated.The chemical structure,surface morphology,phase change characteristics,and encapsulation rate of the phase change microcapsules were analyzed using FT-IR,DSC,and electron microscopy.The analysis found that when the addition of nano TiO2 was 3%,the surface morphology of the phase change microcapsules was optimal,with the most uniform particle size.The melting enthalpy and crystallization enthalpy were 88.91J/g and 80.4J/g,respectively.Moreover,the encapsulation rate could reach 44.42%.
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