聚环氧乙烷/Al_(2)O_(3)被动辐射降温膜的制备及其性能  

Preparation and properties of polyethylene oxide/Al_(2)O_(3)passive radiative cooling membrane

作　　者：王清鹏 张海艳 王雨婷 张涛 赵燕 WANG Qingpeng;ZHANG Haiyan;WANG Yuting;ZHANG Tao;ZHAO Yan(College of Textile and Clothing Engineering,Soochow University,Suzhou,Jiangsu 215123,China)

机构地区：[1]苏州大学纺织与服装工程学院,江苏苏州215123

出　　处：《纺织学报》2024年第9期33-41,共9页Journal of Textile Research

基　　金：纺织行业丝绸功能材料与技术重点实验室开放课题项目(SDHY2235)。

摘　　要：针对传统制冷技术存在能耗大、额外产生热量、排放温室气体等弊端,以聚环氧乙烷(PEO)为原料,基于静电纺丝技术制备PEO微纳米纤维膜,并采用共混法将纳米氧化铝(Al_(2)O_(3))颗粒添加到PEO纺丝溶液中,通过静电纺丝制备出PEO/Al_(2)O_(3)微纳米纤维膜,用于日间被动辐射降温。分析了纤维膜的形貌、太阳光反射率、大气窗口波段红外光透过率、发射率以及日间辐射降温性能。结果表明:由于微纳米纤维结构和纳米Al_(2)O_(3)颗粒的有效散射,使纤维膜的平均太阳光反射率达到90.2%;PEO作为选择性辐射降温材料,结合Al_(2)O_(3)纳米颗粒的声子极化共振,使得PEO/Al_(2)O_(3)纤维膜在大气窗口波段的发射率为90.0%,当Al_(2)O_(3)的质量分数为4%时,在平均太阳光强度为712.3 W/m^(2)、环境湿度为14.2%的条件下,相对于环境温度日间降温达6.1℃。Objective Rapid population growth and industrialization cause global warming.Improving the cooling efficiency of materials and slowing down global warming become a top priority.With the development of micro/nano technology,through the design and preparation of new materials,high solar reflectivity and high infrared emissivity in the atmospheric window band infrared emissivity can be achieved to improve the daytime radiative cooling effect.Method Using polyethylene oxide(PEO)as the raw material,PEO fibrous membranes were prepared through electrospinning technology.PEO/Al_(2)O_(3)fibrous membranes were fabricated by combining different contents of nano-Al_(2)O_(3)into PEO micro-nanofibers through a blending method.The morphology,reflectance of sunlight,mid-infrared transmittance and emissivity in the atmospheric window,and daytime radiative cooling performance of fibrous membranes were studied and analyzed.Results Through SEM analysis,it was confirmed that the nano-Al_(2)O_(3)particles were combined into the fibers,and the diameters of the fibers obtained by electrospinning were mainly distributed in the range of 0.2-1.6μm,while the solar spectrum was in the range of 0.25-2.5μm,demonstrating that the fibrous membrane has a strong scattering effect on sunlight.The increase in the content of nano-Al_(2)O_(3)particles in fibrous membrane was confirmed by EDS analysis.The crystallization properties of the fibrous membranes were analyzed,and the results confirmed the existence of nano-Al_(2)O_(3)particles in the FPRC-4 membrane.The chemical structure analysis suggested that the FPRC-4 membrane had no obvious characteristic peak in the mid-infrared band of 8-13μm,and that it can achieve selective emission in the wavelength range of 8-13μm.The effects of Al_(2)O_(3)content and membrane thickness on solar light reflectance and mid-infrared transmittance were studied.The results indicated that owing to the effective scattering of micro-nanofiber structure and nano-Al_(2)O_(3),the average solar light reflectance of the m

关 键 词：被动辐射降温 静电纺丝 聚环氧乙烷 纳米氧化铝 微纳米纤维 

分 类 号：TS102.6[轻工技术与工程—纺织工程]