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<p>Passive daytime radiative cooling (PDRC) is a zero-energy cooling technology with broad application prospects, particularly in reducing global cooling energy consumption and mitigating carbon dioxide emissions. Currently, PDRC materials with delicate structure design by facile processing method still remain a significant challenge. Here, we utilized thiol-ene click chemistry and digital light processing (DLP) 3D printing technology to successfully fabricate durable porous polymer radiative coolers with cylindrical protruding microstructures. The porous structure was formed through phase separation induced by radical-mediated polymerization reactions, while its surface microstructures were engineered through precisely controlled, adjustable patterned designs using a digital light processing (DLP) printer. The resulting polymer exhibits sufficient solar reflectance (87.78%) and infrared emissivity (98.01%). Under average solar irradiance of 866.72&#xa0;W&#xa0;m<sup>−2</sup>, GMSi-0.5–4.5 porous polymer achieved a cooling effect of 11.48&#xa0;°C compared to the ambient temperature. Additionally, it exhibited a thermal conductivity of only 0.07408&#xa0;W&#xa0;(m&#xa0;K)⁻<sup>1</sup>, demonstrating its outstanding thermal insulation performance. Simulations of building energy consumption using EnergyPlus software show that applying GMSi-0.5–4.5 polymer to building facades can reduce average annual energy consumption by 48.54%.</p>

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3D-printed thermal insulation and radiative cooling polymer with delicate surface structure

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Yunhe Li,
  • Xun Zhang,
  • Siqi Zhang,
  • Yanghang Liu,
  • Lizhi Wang,
  • Yuxuan Ma,
  • Dan Yu,
  • Wei Wang

摘要

Passive daytime radiative cooling (PDRC) is a zero-energy cooling technology with broad application prospects, particularly in reducing global cooling energy consumption and mitigating carbon dioxide emissions. Currently, PDRC materials with delicate structure design by facile processing method still remain a significant challenge. Here, we utilized thiol-ene click chemistry and digital light processing (DLP) 3D printing technology to successfully fabricate durable porous polymer radiative coolers with cylindrical protruding microstructures. The porous structure was formed through phase separation induced by radical-mediated polymerization reactions, while its surface microstructures were engineered through precisely controlled, adjustable patterned designs using a digital light processing (DLP) printer. The resulting polymer exhibits sufficient solar reflectance (87.78%) and infrared emissivity (98.01%). Under average solar irradiance of 866.72 W m−2, GMSi-0.5–4.5 porous polymer achieved a cooling effect of 11.48 °C compared to the ambient temperature. Additionally, it exhibited a thermal conductivity of only 0.07408 W (m K)⁻1, demonstrating its outstanding thermal insulation performance. Simulations of building energy consumption using EnergyPlus software show that applying GMSi-0.5–4.5 polymer to building facades can reduce average annual energy consumption by 48.54%.