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Abstract <p>Using polyurethane-modified phase change materials, the heat storage performance and the regulation effect on the pore structure of concrete were studied to improve the interfacial compatibility. The results demonstrate that increasing porosity significantly enhances paraffin adsorption and thermal buffering capacity, with the heating rate reduced from 6.43 to 1.14°C/min as foaming agent content increases. At an optimal formulation, a balance between mechanical integrity (1.5 MPa compressive strength) and porosity (20% water absorption) is achieved. Notably, PU modification reduces the 7-day leakage rate to 52.13%, confirming improved paraffin retention without the need for additional encapsulation. Microstructural and spectroscopic analyses (SEM, XRD, FT-IR) reveal that PU enhances interfacial adhesion and promotes uniform paraffin distribution within the pore network. This study presents a novel approach for advancing temperature-regulated building energy-saving materials through a collaborative design strategy.</p> Graphical abstract <p></p>

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Synergistic polyurethane porous design for stable phase change material integration in foamed concrete

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Xianglong Wan,
  • Timphena Nathabeth Jah,
  • Shicheng Zhang,
  • Shiping Han,
  • Yahan Xu

摘要

Abstract

Using polyurethane-modified phase change materials, the heat storage performance and the regulation effect on the pore structure of concrete were studied to improve the interfacial compatibility. The results demonstrate that increasing porosity significantly enhances paraffin adsorption and thermal buffering capacity, with the heating rate reduced from 6.43 to 1.14°C/min as foaming agent content increases. At an optimal formulation, a balance between mechanical integrity (1.5 MPa compressive strength) and porosity (20% water absorption) is achieved. Notably, PU modification reduces the 7-day leakage rate to 52.13%, confirming improved paraffin retention without the need for additional encapsulation. Microstructural and spectroscopic analyses (SEM, XRD, FT-IR) reveal that PU enhances interfacial adhesion and promotes uniform paraffin distribution within the pore network. This study presents a novel approach for advancing temperature-regulated building energy-saving materials through a collaborative design strategy.

Graphical abstract