Structure And Properties Of Electrospun Functional PA6 Composite Nanofibers

In this dissertation, polyamide 6 (PA6) was electrospun into functional nanofiber mats with the additives of Ag, TiO2 nanoparticles and multi-walled carbon nanotubes (MWCNT). The mechanical properties of composite nanofibers were improved greatly by changing the content and the mixing proportion of the additives, and the fibers showed excellent antibacterial property meanwhile. The properties of the electrospun nanofibesr/nonwoven composite medical masks were researched after analyzing the structure and properties of the composite nanofibers.Effects of nano-additives on the structure and properties of the composite nanofiber mats: The morphology, crystal structure, thermal property, mechanical property, and antibacterial property against Staphylococcus aureus bacteria of the composite fibers with the addition of Ag, TiO2, MWCNT and Ag/TiO2 two-component additives respectively were studied. The crystallinity, thermal stability and strength of the fibers were all enhanced with the adding of the nano-additives. Especially at 1wt.% Ag nanoparticles, the PA6/Ag composite nanofibers exhibited excellent antibacterial property, and the strength is higher than twice of the pure PA6 nanofibers.Effects of electrospinning time on the surface performance and permeability of the nanofiber mats: Prepared PA6/Ag nanofiber mats and nanofibesr/nonwoven composite masks with different thickness via controlling electrospinning time. With the increasing of electrospunning time, the number of pores in the nanofiber mat is increased, while the pore size decreased, so that the surface wettability of fiber mats is enhanced. When the nonwoven mask was covered the nanofibers which electrospun only 1 minute, the average pore area of the composite was small enough to obstruct most of aerosols with virus, and the air permeability was decreased slightly.