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

IF 26.8 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Pub Date : 2025-02-28 DOI:10.1002/adma.202500738

Cong Guo, Chuanlong Li, Zeshuang Qiao, Chuxin Lei, Zhengyu Ju, Yongzheng Zhang, Qin Zhang, Qiang Fu, Kai Wu

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Abstract

Crack damage and expansion are prevalent issues in outdoor materials, which absorb or transmit sunlight to damaged areas, substantially impairing the functionality of passive radiative cooling systems. Herein, a silicone/dielectric radiative cooling compound is introduced that is both self-healing and crack-resistant, developed through the synthesis of a dynamic and crack-resistant polymer/dielectric hydrogen bond network. This network incorporates boron nitride dielectrics, which serve as sunlight scatterers and hydrogen bond acceptors, with customized silicone polymer featuring high atmospheric window emissive chain segments and UV–vis-NIR transparent hydrogen bond moieties. When cracks form, the polymer's chain mobility allows the hydrogen bond moieties in boron nitride and silicone to re-associate, realizing self-healing of cracks from micrometers to millimeters wide and restoring cooling performance to ≈100%. The combination of rigid boron nitride and sacrificial hydrogen bonds in polymer also enhances the materials’ fracture energy to 865%, effectively preventing further crack propagation under stress through autonomous crack blunting and deflection. These remarkable characteristics make this radiative cooling compound highly suited for increasingly complex, dynamic, and prolonged outdoor application environments.

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抗裂和自愈合被动辐射冷却硅化合物

裂纹破坏和膨胀是室外材料中普遍存在的问题，它吸收或传输阳光到受损区域，严重损害了被动辐射冷却系统的功能。本文通过合成动态抗裂聚合物/电介质氢键网络，开发了一种自愈和抗裂的有机硅/介电辐射冷却化合物。该网络结合了氮化硼介电体，作为阳光散射体和氢键受体，以及定制的有机硅聚合物，具有高大气窗口发射链段和紫外-可见-近红外透明氢键部分。当裂缝形成时，聚合物的链迁移性允许氮化硼和硅中的氢键部分重新结合，实现从微米到毫米宽的裂缝的自我修复，并将冷却性能恢复到≈100%。刚性氮化硼和牺牲氢键在聚合物中的结合也将材料的断裂能提高到865%，通过自发的裂纹钝化和挠曲，有效地阻止了应力作用下裂纹的进一步扩展。这些显著的特性使这种辐射冷却化合物非常适合日益复杂，动态和长时间的户外应用环境。

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来源期刊

Advanced Materials 工程技术-材料科学：综合

CiteScore

43.00

自引率

4.10%

发文量

2182

审稿时长

2 months

期刊介绍： Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.