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<p>Delignified wood (DLW) with its hierarchically porous structure serves as a sustainable and robust scaffold for shaping phase change materials (PCMs). This work designs a multifunctional wood-based composite by vacuum-impregnating n-octadecane into DLW and delignified-hemicellulose wood (DHLW) matrices, followed by coating with wood wax oil or polyurethane. The n-octadecane/DLW composite demonstrated an optimal phase change enthalpy of 165&#xa0;J/g with a transition temperature (25–30&#xa0;°C) well-within the human comfort zone. Removal of hemicellulose compromised the structural integrity of the wood scaffold, resulting in a 19% reduction in latent heat. Crucially, the surface coating played a decisive role in modulating the thermal performance: wood wax oil enhanced the enthalpy by 20% (to 197.2&#xa0;J/g) via a hydrophobic sealing effect, whereas the polyurethane coating caused a 39% reduction due to its spatial hindrance. Thermal stability analysis confirmed that the composites are reliable for practical applications, with decomposition temperatures exceeding 220&#xa0;°C. This study elucidates the synergistic substrate-component–interface relationship in bio-based PCMs, providing a new paradigm for developing intelligent temperature-regulating wood and sustainable thermal management materials.</p>

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Interfacial engineering of delignified wood phase-change composites: synergy between vacuum impregnation and surface coating for intelligent thermal management

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Xiaodong Zhu,
  • Yangweizhe Zheng,
  • Jintao Lu,
  • Yu Liu

摘要

Delignified wood (DLW) with its hierarchically porous structure serves as a sustainable and robust scaffold for shaping phase change materials (PCMs). This work designs a multifunctional wood-based composite by vacuum-impregnating n-octadecane into DLW and delignified-hemicellulose wood (DHLW) matrices, followed by coating with wood wax oil or polyurethane. The n-octadecane/DLW composite demonstrated an optimal phase change enthalpy of 165 J/g with a transition temperature (25–30 °C) well-within the human comfort zone. Removal of hemicellulose compromised the structural integrity of the wood scaffold, resulting in a 19% reduction in latent heat. Crucially, the surface coating played a decisive role in modulating the thermal performance: wood wax oil enhanced the enthalpy by 20% (to 197.2 J/g) via a hydrophobic sealing effect, whereas the polyurethane coating caused a 39% reduction due to its spatial hindrance. Thermal stability analysis confirmed that the composites are reliable for practical applications, with decomposition temperatures exceeding 220 °C. This study elucidates the synergistic substrate-component–interface relationship in bio-based PCMs, providing a new paradigm for developing intelligent temperature-regulating wood and sustainable thermal management materials.