Zhong Wenyu, Chen Yichong, Hu Dongdong, Sun Jiayang, Jia Xingyu, Zhao Ling
State Key Laboratory of Chemical Engineering, Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
Shanghai Electronic Chemicals Innovation Institute, East China University of science and Technology, Shanghai, 201419, P. R. China.
Adv Sci (Weinh). 2025 May;12(19):e2501188. doi: 10.1002/advs.202501188. Epub 2025 Mar 24.
Global climate warming has dramatically increased the demand for space cooling. Materials that integrate superior thermal insulation with passive daytime radiative cooling properties hold significant promise for reducing energy consumption for space cooling during hot summers. In this study, conduction-microwave heating assisted CO foaming process is used to optimize cell size and expansion ratios, producing PMMA/PVDF foam with an ultra-high expansion ratio of 120 times and small, uniform cells. The foam is hydrophobic, chemically resistant, and recyclable, with a negative Poisson's ratio structure that gives it outstanding compression strength, elasticity, and flexibility, making it suitable for both everyday use and extreme weather conditions. The inherent properties of the material and its cell structure confer low thermal conductivity (26.69 mW m K), high solar reflectance (96.37%), and high infrared emissivity (97.34%). This means that indoor cooling of buildings can be achieved in hot weather (15 °C difference in test results before and after use), meeting the cooling needs of buildings in most countries around the world. The ultra-high expansion ratio PMMA/PVDF foam demonstrates significant potential in energy conservation, reducing carbon footprints, and promoting sustainability, providing a solution for the development of next-generation buildings.
全球气候变暖极大地增加了对空间制冷的需求。将卓越的隔热性能与被动日间辐射冷却特性相结合的材料，对于在炎热的夏季降低空间制冷能耗具有巨大潜力。在本研究中，采用传导 - 微波加热辅助的CO发泡工艺来优化泡孔尺寸和膨胀比，制备出具有120倍超高膨胀比且泡孔小而均匀的PMMA/PVDF泡沫。该泡沫具有疏水性、耐化学性且可回收，其负泊松比结构赋予了它出色的抗压强度、弹性和柔韧性，使其适用于日常使用和极端天气条件。材料的固有特性及其泡孔结构赋予其低导热率（26.69 mW m⁻¹ K⁻¹）、高太阳反射率（96.37%）和高红外发射率（97.34%）。这意味着在炎热天气下可实现建筑物的室内制冷（使用前后测试结果温差达15°C），满足世界上大多数国家建筑物的制冷需求。超高膨胀比的PMMA/PVDF泡沫在节能、减少碳足迹和促进可持续发展方面展现出巨大潜力，为下一代建筑的发展提供了一种解决方案。
