PTFE/PVA-PVDF Conjugated Electrospun Nanofiber Membrane with Triboelectric Effect Used in Face Mask

COVID-19 broke out all over the world, and the medical protective mask is an important epidemic prevention equipment. Traditional medical protective masks use electret polypropylene melt-blown cloth as the core filter material. However, it relies heavily on electrostatic filtration and has high filtration resistance. The one-time electret makes the static charge decay rapidly with the water vapor generated by breathing, which affects the service life of the mask. In this paper, PTFE/PVA fiber and PVDF fiber were fabricated by conjugate electrospinning method, and the PTFE/PVA-PVDF layer blending fluffy fiber membrane was obtained by on-line mixing. Under the action of air slip effect and triboelectric secondary electret, the fiber membrane has higher filtration efficiency, lower filtration resistance and longer service life. The initial filtration efficiency of the fiber membrane is above 95%, the filtration efficiency is near to 100% after 24 times of cyclic filtration, the filtration resistance is about 110 Pa, the air permeability of the fiber membrane is 262.88–370.70 mm/s, and the moisture permeability is as high as 7721–8471 g/ (m 2 ·24 h). Graphical Abstract