Anti-deformed Polyacrylonitrile/Polysulfone Composite Membrane with Binary Structures for Effective Air Filtration
Anti-deformed Polyacrylonitrile/Polysulfone Composite Membrane with Binary Structures for Effective Air Filtration
复制标题
具有二元结构的抗变形聚丙烯腈/聚砜复合膜，可有效过滤空气
DOI：
10.1021/acsami.6b00359
复制
发表时间：
2016-03-30
影响因子：
9.5
通讯作者：
Ding, Bin
中科院分区：
文献类型：
--
作者：
Zhang, Shichao;Liu, Hui;Ding, Bin
针对纤维的空气微粒过滤，需要将纤维组装成孔径小、填充密度低的多孔结构。在使用过程中，在变形应力下保持结构稳定性的能力对于确保高多孔性包装材料的可靠运行至关重要；然而，事实证明它极具挑战性。本文报道了一种结合多射流静电纺丝和物理键合工艺制备抗变形聚（环氧乙烷）@聚丙烯腈/聚砜（PEO@PAN/PSU）二元结构复合膜的策略，用于有效的空气过滤。我们的方法利用PEO的灵感，通过优化双峰纤维结构，使双峰纤维框架（包括薄的PAN纳米纤维和蓬松的PSU微纤维）能够组装成具有可调孔径和填充密度的稳定过滤介质。该复合膜具有孔径小、孔隙率高、力学性能优良（8.2 MPa）等特点，过滤效率高达99.992%，压降低至95 Pa，质量因数为0.1 Pa-1；更重要的是，它成功地消除了在使用应力下结构意外倒塌带来的安全隐患。PEO@PAN/PSU介质的合成不仅使其成为PM2.5治理的有希望的候选者，而且还为设计和开发用于各种应用的稳定多孔膜提供了一种通用策略。
Airborne particle filtration proposed for fibers requires their assembly into porous structures with small pore size and low packing density. The ability to maintain structural stability upon deformation stress in service is essential to ensure a highly porous packing material that functions reliably; however, it has proven extremely challenging. Here, we report a strategy to create anti-deformed poly(ethylene oxide)@polyacrylonitrile/polysulfone (PEO@PAN/PSU) composite membranes with binary structures for effective air filtration by combining multijet electrospinning and physical bonding process. Our approach allows the ambigenous fiber framework including thin PAN nanofibers and fluffy PSU microfibers, through which run interpenetrating PEO bonding structures, to assemble into stable filtration medium with tunable pore size and packing density by facilely optimizing the bimodal fiber construction and benefiting from the PEO inspiration. With the integrated features of small pore size, high porosity, and robust mechanical properties (8.2 MPa), the resultant composite membrane exhibits high filtration efficiency of 99.992%, low pressure drop of 95 Pa, and desirable quality factor of 0.1 Pa-1; more significantly, it successfully gets rid of the potential safety hazards caused by unexpected structural collapsing under service stress. The synthesis of PEO@PAN/PSU medium would not only make it a promising candidate for PM2.5 governance but also provide a versatile strategy to design and develop stable porous membranes for various applications.