Design and synthesis of microcapsules with cross-linking network supporting core for supercooling degree regulation

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 (CPODMA) 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 3.7t ti 8.3t and increase the crystallization temperature by 1.0t ti 2.6t. At the same time, the thermal decomposition temperature of CPCMs increased by 11.6t ti 34.6t 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. (c) 2021 Published by Elsevier B.V.

Automated summary

A novel microencapsulated composite phase change material (MCPCMs) with low-supercooling was successfully prepared using melamine formaldehyde resin (MF) as the shell. The composite phase change materials (CPCMs) showed enhanced thermal decomposition temperature, energy storage efficiency, and satisfactory thermal cycle stability. This material has broad application prospects in heat storage textiles, forming processing, and energy-saving building materials.