梯度复合聚丙烯腈纳米纤维膜的制备及其过滤性能

为发挥纳米纤维膜在高效空气过滤材料领域的作用并实现连续化生产，通过自制静电辅助溶液喷射纺丝实验机，采用Box-Behnken试验设计方法，建立了聚丙烯腈(PAN)纳米纤维直径和纺丝工艺参数的关系。利用在线复合方式连续制备了不同直径梯度复合的PAN纳米纤维膜并将其用于空气过滤领域，并对纤维膜的结构和形貌进行了表征。结果表明：通过调整纺丝工艺参数可有效地实现对纤维直径的控制；同时由该技术所制得的复合膜在消除静电后，通过物理筛分作用，对0.4 μm的癸二酸二辛酯粒子具有99.923 %的过滤效率和117 Pa的压降，对大于0.8 μm的粒子具备100 %的过滤效率。

Preparation and filtration performance of polyacrylonitrile graded composite nanofiber membrane

In order to play the role of nanofiber membrane infield of high efficiency air filter material and realize the continuous production of nanofiber filter material, the Box-Behnken trial design method was used to establish the relationship between polyacrylonitrile (PAN) nanofiber diameter and spinning process parameters. The nanofibers used inthefield of air filtration were prepared with aself-made electrostatic-induction-assisted solution blown machine, and PAN nanofibers with controllable diameter were prepared continuously. PAN nanofibers with different diameters were prepared by continuous on-line composite design. The structure and morphology of the fiber membrane were prepared bycontinuous on-line composite design. The structure and morphology of the fiber membrane were characterized.The reaults indicates that byadjusting the spinning process parameters, the control of fiber diameter can be effectively achieved. Meanwhile, the composite membrane by this technology is fabricated by physical screening after eliminating static electricity. The removal rate and pressure drop of the composite membrane for dioctyl sebacate particles (0f 0.4 μm)are 99.923 % and 117 Pa, respectively. The filtration efficiency for particles withlarger than0.8 μm is 100%.