Abstract
A novel microencapsulated composite phase change materials (MCPCMs) with low-supercooling was designed using melamine formaldehyde resin (MF) as the shell via in-situ polymerization. The composite phase change materials (CPCMs) were composed of low cross-linked polyoctadecyl methacrylate (C-PODMA) as solid–solid PCM and n-octadecane (C18) as solid–liquid PCM, respectively. The C-PODMA can be used not only as a support material, but also as an energy storage material. In this work, the effects of C-PODMA with different cross-linking degree, C18/C-PODMA mass ratios and particle size on the performance of cross-linking network supported microcapsules (CS-MCPCMs) were investigated in detail. The results showed that the spherical CS-MCPCMs had been successfully prepared. During the synthesis process, the crystal transformation and heterogeneous nucleation caused by C-PODMA can inhibit the supercooling degree of CS-MCPCMs to some extent, which can decrease by 3.7℃ ∼ 8.3℃ and increase the crystallization temperature by 1.0℃ ∼ 2.6℃. At the same time, the thermal decomposition temperature of CPCMs increased by 11.6℃ ∼ 34.6℃ and the energy storage efficiency of CS-MCPCMs was enhanced to 84.2%. It also has relatively high latent heat and satisfactory 150 thermal cycle stability. CS-MCPCMs has broad application prospects in heat storage textiles, forming processing and energy saving building materials.
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