Polyethersulfone fiber webs
A technology of polyethersulfone fibers and fiber nets, which is applied in the field of fiber nets and can solve problems such as reducing the surface area of fiber nets
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Embodiment 1
[0082] This example compares a filter media comprising a PES web to a commercially available filter media comprising a PES membrane (non-fiber based).
[0083] PES webs are manufactured by electrospinning process. Two samples were formed by laminating a PES web between two meltblown layers.
[0084]Table 1 below shows the measured surface area for each of filter media comprising PES webs (Samples 1 and 2) and three commercially available PES membranes (Commercially available Samples 1 to 3), for 0.2 micron diameter polystyrene spheres Filtration efficiency, water permeability, BSA throughput, logarithmic drop and quantification. BSA throughput was measured by dissolving 50 mg BSA in 1 liter of phosphate buffered saline and then passing the BSA solution through the filter media at a pressure of 6 psi.
[0085] Table 1
[0086]
[0087] The filter media comprising the PES web had a much higher measured surface area, comparable or better filtration efficiency, and much bett...
Embodiment 2
[0089] This example compares PES webs with different relative surface areas.
[0090] PES webs with different levels of relative surface area were fabricated by electrospinning process and their filtration efficiency for 0.2 μm diameter polystyrene spheres was measured. Table 2 shows the fiber diameter, basis weight, ratio of maximum pore size to mean flow pore size, water permeability, bead density, relative surface area, and filtration efficiency for 0.2 micron spheres for five of these samples. Basis weight, water permeability, bead density, and filtration efficiency for 0.2 micron diameter polystyrene spheres were measured as described above. The relative surface area was determined by using a linear correlation of the measured relative area to the bead area measured using SEM. As shown in Table 2, each mm of low 2 The number of beads and the low ratio of maximum pore size to mean flow pore size also correlate with filtration efficiency.
[0091] Table 2
[0092]
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Embodiment 3
[0095] This example shows the effect of oxygen plasma treatment on the water permeability of PES webs.
[0096] Two PES webs (Samples 3 and 4) fabricated by the electrospinning process were further treated with oxygen plasma using a CVD process. The water permeability of the PES web was measured before and after the process and is shown in Table 3 below.
[0097] table 3
[0098]
[0099] Oxygen plasma treatment increased water permeability by at least 50% for both PES webs.
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