A Radiative-Cooling Hierarchical Aligned Porous Poly(vinylidene fluoride)Film by Freeze-Thaw-Promoted Nonsolvent-Induced Phase Separation  

作　　者：Yiting Zhang Jiahui Sun Yufeng Wang Yunchen Wu Chun Huang Chao Zhang Tianxi Liu 

机构地区：[1]Key Laboratory of Synthetic and Biological Colloids Ministry of Education,School of Chemical and Material Engineering,Jiangnan University,Wuxi,214122,China [2]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai,201620,China

出　　处：《Chinese Journal of Polymer Science》2024年第7期976-983,I0009,共9页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52273067);the Fundamental Research Funds for the Central Universities(No.2232023A-03);the Shuguang Program of Shanghai Education Development Foundation and Shanghai Municipal Education Commission(No.23SG29)。

摘　　要：Passive daytime radiative cooling(PDRC)is an innovative and sustainable cooling technology that holds immense potential for addressing the energy crisis.Despite the numerous reports on radiative coolers,the design of a straightforward,efficient,and readily producible system remains a challenge.Herein,we present the development of a hierarchical aligned porous poly(vinylidene fluoride)(HAP-PVDF)film through a freeze-thaw-promoted nonsolvent-induced phase separation strategy.This film features oriented microporous arrays in conjunction with random nanopores,enabling efficient radiative cooling performance under direct sunlight conditions.The incorporation of both micro-and nano-pores in the HAP-PVDF film results in a remarkable solar reflectance of 97%and a sufficiently high infrared thermal emissivity of 96%,facilitating sub-environmental cooling at 18.3℃ on sunny days and 13.1℃ on cloudy days.Additionally,the HAP-PVDF film also exhibits exceptional flexibility and hydrophobicity.Theoretical calculations further confirm a radiative cooling power of 94.8 W·m^(-2)under a solar intensity of 1000W·m^(-2),demonstrating a performance comparable to the majority of reported radiative coolers.

关 键 词：Daytime radiative cooling Hierarchical porosity PVDF porous film Thermal insulation Nonsolvent-induced phase separation 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业] TB383.2[一般工业技术—材料科学与工程]