Green synthesis of fluorine-containing polyimide aerogels toward passive daytime radiative cooling for energy saving

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-05-09 DOI:10.1016/j.coco.2025.102450

Qiaoran Zhang , Xinfei Wang , Xueyan Hu , Dianhui Yang , Hongliang Wei , Xiaoyu Cao , Yanbei Hou , Jin Wang

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Abstract

Traditional organic passive daytime radiative cooling (PDRC) materials have attracted extensive attention due to their abundant chemical structures and flexible mechanical properties. However, their flammability and ultraviolet radiation degradation seriously limited their sustainable application. Herein, a chemical-physical dual strategy is proposed by introducing fluorine and silica nanoparticles into a traditional polyimide aerogel to reshape both the chemical and microstructure and give birth to fluorine and silica functionalized polyimide composite aerogels (FSPI), showing PDRC with inherent flammability and ultraviolet radiation resistance. Owing to the presence of fluorine and silica, the FSPI aerogels show high solar reflectance (∼92.8 %) in the wavelength of 0.78–1.1 μm and high IR emissivity (∼93.0 %) among 8–13 μm, thus fulfilling a passive sub-ambient cooling of ∼9.4 °C at daytime. Meanwhile, the fluorine and silica also endow the FSPI with outstanding thermal stability (T_{-5 %}, ∼524 °C), hydrophobicity (water contact angle ∼120.4°), anti-aging, and flame-retardant (PHRR, 13.1 W g⁻¹) performances, making them ideal candidates for sustainable cooler in building energy saving. This study provides a general and powerful route toward organic PDRC materials for anti-aging, flame-retardant, and water-resistance applications.

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面向被动日间辐射制冷的含氟聚酰亚胺气凝胶绿色合成节能研究

传统的有机被动日间辐射制冷材料因其丰富的化学结构和灵活的力学性能而受到广泛关注。然而，它们的可燃性和紫外线降解严重限制了它们的可持续应用。本文提出了一种化学-物理双重策略，将氟和二氧化硅纳米颗粒引入传统的聚酰亚胺气凝胶中，重塑其化学和微观结构，从而产生氟和二氧化硅功能化聚酰亚胺复合气凝胶（FSPI），该气凝胶具有固有的可燃性和抗紫外线辐射能力。由于氟和二氧化硅的存在，FSPI气凝胶在0.78 ~ 1.1 μm波段具有较高的太阳反射率（~ 92.8%），在8 ~ 13 μm波段具有较高的红外发射率（~ 93.0%），从而在白天实现了~ 9.4°C的被动亚环境冷却。同时，氟和二氧化硅还赋予FSPI出色的热稳定性（t - 5%, ~ 524°C），疏水性（水接触角~ 120.4°），抗老化和阻燃性（PHRR, 13.1 W g−1）性能，使其成为建筑节能可持续冷却器的理想选择。这项研究为有机PDRC材料的抗老化、阻燃和防水应用提供了一条通用而有力的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.