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Abstract
AbstractMelamine–urea–formaldehyde resins/n‐dodecanol microencapsulated phase‐change materials (microPCMs) were prepared by in situ polymerization method in this work. In the microPCMs, the n‐dodecanol was used as phase‐change material (PCM) for thermal energy storage, and the melamine–urea–formaldehyde resins (MUF) acted as shell materials. The Fourier‐transform infrared spectroscopy (FT‐IR) indicated that the PCM n‐dodecanol is encapsulated in the MUF shell controlling pH of n‐dodecanol emulsion at 4.5, and there is no chemical reaction between them. The thermal properties of the microcapsules were measured by differential scanning calorimeter (DSC). The morphology and particle size of the microPCMs were surveyed by scanning electron microscopy (SEM) and laser particle diameter analyzer. The results showed that styrene‐maleic anhydride copolymer (SMA) anionic emulsifier is suitable for the preparation of MUF microPCMs. The cooling and melting phase‐change enthalpy were 130.5 and 135.2 J/g, and the cooling and melting phase‐change temperature were 20.9 and 19.11°C when core–shell ratio reached 3:1. In addition, increasing amount of SMA can enhance the phase‐change enthalpy.
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