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<p>This study used paraffin as the matrix and rare earth tailings as the framework supporting material. Composite phase change materials loaded with rare earth tailings at different ratios (5%,&#xa0;10%, 15%, and 20%) were prepared using the melt blending method. The materials were characterized by XRD and FTIR, and leakage rate, thermal stability and kinetic analysis were also conducted. The composite PCM with 15% rare earth tailings exhibited the highest thermal stability enhancement, along with excellent physical and chemical compatibility. The Coats-Redfern and Malka methods determined the A1 model as the optimal model, with an activation energy of 48.48 kilojoules/mole and a pre-exponential factor of 1.967 min<sup>−1</sup>, with a corresponding decomposition reaction kinetic model established. This work provides insights into optimizing composite phase change materials for thermal energy storage applications.</p>

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A study on the structure, thermal properties and thermal decomposition kinetics of a composite phase change material based on paraffin/raffinate tailings

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Yuxuan Sui,
  • Xinzhan Wang,
  • Yihong Niu,
  • Yuqiao Ye,
  • Zhiyu Zhang,
  • Limin Hou

摘要

This study used paraffin as the matrix and rare earth tailings as the framework supporting material. Composite phase change materials loaded with rare earth tailings at different ratios (5%, 10%, 15%, and 20%) were prepared using the melt blending method. The materials were characterized by XRD and FTIR, and leakage rate, thermal stability and kinetic analysis were also conducted. The composite PCM with 15% rare earth tailings exhibited the highest thermal stability enhancement, along with excellent physical and chemical compatibility. The Coats-Redfern and Malka methods determined the A1 model as the optimal model, with an activation energy of 48.48 kilojoules/mole and a pre-exponential factor of 1.967 min−1, with a corresponding decomposition reaction kinetic model established. This work provides insights into optimizing composite phase change materials for thermal energy storage applications.