A novel approach for constructing plantation wood-based phase change energy storage composites exhibiting high dimensional stability and mechanical performance
Wood is a key raw material for indoor phase change energy storage materials, but balancing energy storage efficiency and physical performances is a hard nut to crack. This study proposed a novel method of heterogeneously encapsulating phase change agents and enhancement components in wood cells. The method aimed to make wood-based phase change energy storage composites with high mechanical performance and dimensional stability. Analysis showed that low-concentration PEG (≤20 %) infiltrates cell walls to improve dimensional stability. Higher concentrations (>20 %) first saturate the walls and then occupy the cell cavities for latent heat storage. The epoxy polymer fills the remaining cavities, thereby reducing PEG leakage and improving the mechanical properties of the wood. Through comprehensive property evaluation, a PEG 800 solution concentration of 40 % was determined to be optimal in the first step, achieving a balanced phase-change enthalpy of 20.11 J/g, improved dimensional stability (water-soaking anti-swelling efficiency: 68.01 %), and enhanced mechanical performance. This research had the potential to significantly promote the practical application of wood-based energy storage materials.
危险品化学品经营许可证（带存储）