Preparation and properties of high temperature resistant ultrafiltration aramid nanofiber/PPS composite material

DMAc/LiCl was used as solvent to dissolve meta-aramid fibers and the resulting solution was employed to prepare aramid nanofibers of a diameter in a range from 100 to 500 nm by high pressure electrospinning,which were combined with needle punched PPS nonwoven fabric and thus obtained high temperature resistant ultrafiltration aramid nanofiber/PPS composite fiber material.The results indicated that the nanofiber membranes had good strength and high temperature resistance,and the aramid nanofiber/PPS composite fiber material had ultrafiltration efficiency up to 99.9% for particles with a size ranging from 0.1 to 0.6 μm,obviously higher than that of PPS nonwoven(about 70%).However,the fast pressure drop for aramid nanofiber/PPS composite material was observed as the thickness of the aramid nanofiber membranes increased,and this may be attributed to the smaller fiber size and smaller pore diameter of the aramid nanofiber membranes,resulting in significant increase in resistance when filtering.