Chen Chen, Xiong Lulu, Cui Yahui, Wang Chaosheng
School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Key Laboratory of High Performance Fibers & Products, Ministry of Education, Donghua University, Shanghai 201620, China.
Polymers (Basel). 2024 Apr 29;16(9):1240. doi: 10.3390/polym16091240.
This paper reports the successful fabrication of a new nanofibrous membrane, F-PI/PAN, through electrospinning of polyacrylonitrile (PAN) and fluorinated polyimide (F-PI). The nanofibrous membrane exhibits comprehensive properties for high-temperature filtration and robust PM (particulate matter with an aerodynamic equivalent diameter of 2.5 microns or less) removal. The introduction of F enhances the hydrophobicity of the PI. The relationship between the hydrophobic performance and the filtration performance of particles is investigated. The chemical group of the composite membrane was demonstrated using FITR, while the surface morphology was investigated using field emission scanning electron microscopy. The TGA results indicated good thermal stability at 300 °C. Various ratios of F-PI membranes were prepared to characterize the change in properties, with the optimal mass ratio of F-PI being 20 wt%. As the proportion of F-PI increases, its mechanical and filtration efficiency properties and hydrophobicity become stronger. The contact angle reaches its maximum of 128 ± 5.2° when PAN:F-PI = 6:4. Meanwhile, when PAN:F-PI = 8:2, the filtration efficiency reaches 99.4 ± 0.3%, and the elongation at break can reach 76%. The fracture strength can also reach 7.1 MPa, 1.63 times that of the pure PAN membrane.
本文报道了通过静电纺丝聚丙烯腈（PAN）和氟化聚酰亚胺（F-PI）成功制备了一种新型纳米纤维膜F-PI/PAN。该纳米纤维膜具有用于高温过滤和高效去除PM（空气动力学等效直径为2.5微米或更小的颗粒物）的综合性能。F的引入增强了PI的疏水性。研究了疏水性与颗粒过滤性能之间的关系。使用傅里叶变换红外光谱（FITR）表征复合膜的化学基团，同时用场发射扫描电子显微镜研究表面形态。热重分析（TGA）结果表明在300℃下具有良好的热稳定性。制备了不同比例的F-PI膜以表征性能变化，F-PI的最佳质量比为20 wt%。随着F-PI比例的增加，其机械性能、过滤效率和疏水性增强。当PAN:F-PI = 6:4时，接触角达到最大值128±5.2°。同时，当PAN:F-PI = 8:2时，过滤效率达到99.4±0.3%，断裂伸长率可达76%。断裂强度也可达到7.1 MPa，是纯PAN膜的1.63倍。
