Effect of In Situ Polymerization on the Thermal Stability and Enthalpy Properties of Wood‐Based Composites Based on Graphene Oxide–Modified Phase Change Microcapsule

ABSTRACT Encapsulation rate and thermal conductivity are crucial parameters for evaluating the properties of microencapsulated phase change materials (MEPCM). Graphene oxide (GO), as a two‐dimensional structure, has high thermal conductivity and is an amphiphilic material, and is expected to comprehensively solve this problem. In this study, a unique GO modified MEPCM was prepared with n‐octadecane as the core material and melamine urea–formaldehyde resin as the shell material. After delignification of balsa wood (DW), GO modified microcapsules were loaded into balsa wood by vacuum assisted impregnation. GO‐modified phase change microcapsule wood‐based composite was prepared. The prepared MEPCM was dispersed without hybridization and showed a regular spherical shape. The latent heat and encapsulation efficiency of GO modified microcapsules were 229.14 J/g and 93.62%, respectively. The latent heat of MEPCM‐GO‐DW is 131.32 J/g, which is 57.31% of the phase change microcapsule. The results show that the prepared GO modified microencapsulated wood‐based composites have better thermal stability and significant phase change enthalpy, and the temperature fluctuation of the room using the phase‐change composite wood wall is more stable than that of the ordinary wood structure wall, which proves that it has a broad application prospect in the field of building heat storage and temperature regulation.