In this work, a composite phase change material was prepared by introducing silica-stabilized polyethylene glycol (PEG) into the porous structure of solid wood by temperature-assisted sol-gel method. Thermal properties, moisture adsorption and dimensional stability of the modified wood were tested and analyzed with help of morphology and structure characterization. The results show that SiO₂ network is formed in modified wood and the modifiers distribute in both wood cell wall and cell lumen. This composite material exhibits considerable heat storage capacity and superior dimensional stability. Thermal cycling test shows the satisfactory thermal reliability of SiO₂/PEG modified wood, suggesting the effective hindrance of SiO₂ network on liquid phase leakage of PEG during phase transition. All above indicates that such modified wood could be potentially utilized as building material for energy conservation.

在这项工作中，通过使用温度辅助溶胶-凝胶法将二氧化硅稳定的聚乙二醇（PEG）引入实木的多孔结构中来制备复合相变材料。借助形态和结构表征，对改性木材的热性能，水分吸附和尺寸稳定性进行了测试和分析。结果表明，改性木材形成了SiO ₂网络，改性剂分布在木材的细胞壁和细胞腔中。这种复合材料具有相当大的储热能力和出色的尺寸稳定性。热循环测试表明SiO ₂ / PEG改性木材具有令人满意的热可靠性，表明SiO ₂的有效阻碍网络在相变过程中PEG的液相泄漏 所有以上表明，这种改性木材可以潜在地用作建筑材料以节约能源。