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Composite dual-layer shell phase change capsules have received attention due to their excellent thermal storage capacity, high thermal conductivityThermal conductivity, and good thermal stability. In this study, a method combining in-situ polymerization and liquid-phase reduction was proposed to prepare polyurea-polyurethane organic phase change nanocapsulesPhase change nanocapsules. Firstly, a polyurea-polyurethane shell is formed on the surface of the core material of butyl stearate through in-situ polymerization method. Afterwards, a layer of silver shell is formed on the surface of the previously prepared phase change capsules which have polyurea-polyurethane shell using the liquid-phase reduction method. Finally, the polyurea-polyurethane/silver shell phase change nanocapsulesPhase change nanocapsules are obtained. The volume encapsulation efficiency of the dual-layer shell phase change nanocapsulesPhase change nanocapsules prepared reaches 82.39%. The thermal conductivityThermal conductivity is 2.164 W/(m·K), indicating an improvement in thermal conductivityThermal conductivity compared with the nanocapsules without the silver shell. After 1000 thermal cycles, minimal enthalpy loss during melting and solidificationSolidification suggests excellent thermal reliability.

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Fabrication and Characterization of Polyurea-Polyurethane/Silver Bilayer Shell Phase Change Nanocapsules

  • 会议论文

  • 发表日期：

    2025年

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  • Sitong Liu,
  • Tonghe Li,
  • Dengti Hu,
  • Hao Bai

摘要

Composite dual-layer shell phase change capsules have received attention due to their excellent thermal storage capacity, high thermal conductivityThermal conductivity, and good thermal stability. In this study, a method combining in-situ polymerization and liquid-phase reduction was proposed to prepare polyurea-polyurethane organic phase change nanocapsulesPhase change nanocapsules. Firstly, a polyurea-polyurethane shell is formed on the surface of the core material of butyl stearate through in-situ polymerization method. Afterwards, a layer of silver shell is formed on the surface of the previously prepared phase change capsules which have polyurea-polyurethane shell using the liquid-phase reduction method. Finally, the polyurea-polyurethane/silver shell phase change nanocapsulesPhase change nanocapsules are obtained. The volume encapsulation efficiency of the dual-layer shell phase change nanocapsulesPhase change nanocapsules prepared reaches 82.39%. The thermal conductivityThermal conductivity is 2.164 W/(m·K), indicating an improvement in thermal conductivityThermal conductivity compared with the nanocapsules without the silver shell. After 1000 thermal cycles, minimal enthalpy loss during melting and solidificationSolidification suggests excellent thermal reliability.