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Crack-Resistant and Self-Healable Passive Radiative Cooling Silicone Compounds.

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  • 1College of Polymer Science and Engineering, National Key Laboratory of Advanced Polymer Materials, Sichuan University, Chengdu, 610065, China.

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Summary
This summary is machine-generated.

This study introduces a self-healing, crack-resistant radiative cooling material. It autonomously repairs cracks, restoring cooling performance and enhancing durability for outdoor applications.

Keywords:
crack resistancepassive radiative coolingself‐healingsilicone compound

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermodynamics

Background:

  • Outdoor materials, especially for passive radiative cooling, suffer from crack damage, impairing sunlight scattering and heat emission.
  • Sunlight absorption or transmission through cracks degrades the efficiency of cooling systems.
  • Existing materials lack robust crack resistance and self-healing capabilities for prolonged outdoor use.

Purpose of the Study:

  • To develop a novel silicone/dielectric radiative cooling compound with self-healing and crack-resistant properties.
  • To enhance the durability and functionality of passive radiative cooling systems under environmental stress.
  • To investigate the mechanism of self-healing and crack resistance in a dynamic hydrogen bond network.

Main Methods:

  • Synthesis of a silicone polymer with UV-vis-NIR transparent hydrogen bond moieties and boron nitride (BN) dielectrics.
  • Fabrication of a dynamic polymer/dielectric hydrogen bond network incorporating BN as sunlight scatterers and hydrogen bond acceptors.
  • Characterization of crack healing efficiency, fracture energy, and cooling performance restoration.
  • Analysis of polymer chain mobility and hydrogen bond re-association for self-healing mechanism.

Main Results:

  • The developed compound exhibits autonomous self-healing of cracks ranging from micrometers to millimeters wide.
  • Cooling performance is restored to approximately 100% after self-healing.
  • Fracture energy is enhanced by 865% due to the combination of rigid BN and sacrificial hydrogen bonds, preventing crack propagation.
  • The material demonstrates autonomous crack blunting and deflection under stress.

Conclusions:

  • The novel silicone/dielectric compound offers superior self-healing and crack resistance for radiative cooling applications.
  • The dynamic hydrogen bond network effectively restores material integrity and cooling function after damage.
  • This material is highly suitable for demanding, long-term outdoor applications requiring robust performance.