摘要
本文采用一种改进的静电纺丝技术制备了TPU/PAN纳米纤维复合膜,研究了不同复合方式、不同层数结构对纳米纤维复合膜的微观形貌的影响,同时研究了纤维膜的面密度对空气过滤测试中过滤效率和过滤压降的影响.为了得到高效低阻的空气过滤用纳米纤维膜,实验探索了TPU(粗纤维)和PAN(细纤维)之间的复合方式以及复合层数对空气过滤性能的影响.实验结果表明,TPU和PAN间的最佳复合方式是Mixed/PAN,最佳层数是Mixed/PAN/Mixed/PAN这种4层结构,当纤维膜的面密度是1.31 g·m^-2时,空气过滤效果最好,过滤效率可达到97.34%,过滤压降仅为98.13 Pa,品质因数为0.038 Pa^-1.这说明了粗细交织结构与层间结构相结合,可以有效提高过滤效率并且降低压降.对过滤性能较好的膜进行泡压法滤膜孔径测试,测得此纤维膜的平均孔径为2.26μm.
Composite nanofiber membranes of thermoplastic urethane/polyacrylonitrile(TPU/PAN) were prepared by an improved electrospinning technique, and the influence of different composite modes and layers on the microstructure of the composite nanaofiber membrane was investigated. Meanwhile, the influence of surface density of nanofiber membrane on the filtration efficiency and filtration pressure drop was also explored in the air filtration test. In order to obtain nanofiber membranes with the high efficiency and low resistance for air filtration, the effect of composite modes and layers of TPU(crude fiber) and PAN(fine fiber) on air filtration were demonstrated. The results show that the optimal combination mode between TPU and PAN is Mixed/PAN, and the optimal number of layers is Mixed/PAN/Mixed/PAN. The best air filtration was achieved when the surface density was 1.31 g·m^-2, and the filtration efficiency reached 97.34%, the filtration pressure drop was only 98.13 Pa, and the quality factor was 0.038 pa^-1. This indicates that the higher efficiency and the lower resistance can be achieved by combination of composite modes and layers. At the same time, the pore diameter of the nanofiber membrane under the optimum conditions was tested by bubble pressure method, and the average value was 2.26 μm.
作者
籍静
王娇娜
李秀艳
张俊
李从举
JI Jing;WANG Jiaona;LI Xiuyan;ZHANG Jun;LI Congju(School of Materials Science and Engineering, Beijing Institute of Clothing Technology, Beijing Key Laboratory of Research , Development and Evaluation of Garment Materials, Beijing, 100029, China;Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, China)
出处
《环境化学》
CAS
CSCD
北大核心
2019年第5期1098-1105,共8页
Environmental Chemistry
基金
北京市自然科学基金(2182014)
北京市科协“金桥工程种子资金”
国家自然科学基金(51503005,21274006)
“北京服装学院高水平教师队伍建设专项资金”(BIFTQG201801)
北京市教育委员会科技计划一般项目(SQKM201710012004)
北京市科技北京百名领军人才工程(Z161100004916168)资助~~
关键词
静电纺丝
粗细交织
层间结构
空气过滤
electrospinning
intertwined structure
inter-layer structure
air filtration
