To obtain electrospun PLLA fibrous membrane with high filtration efficiency and low filtration resistance in mass production

the rheological behavior and surface tension of PLLA solution prepared by dichloromethane (DCM)

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3-hexafluoro-2-propanol (HFIP) and DCM/DMF mixed solvents with different volume ratios were studied by means of rotary rheometer and optical video contact angle meter. The effects of solvent type and content on the spinnability of PLLA solution and the microstructure

filtration performance of the electrospun fibrous membrane were studied by SEM and filtration efficiency tester. Under the same concentration

the flow behavior of PLLA solution prepared by HFIP was pseudoplastic Bingham body

and the viscosity is higher than that of PLLA solution prepared by DCM

resulting in a better spinnability of PLLA solution

finer fibers. The filtration efficiency and resistance of this fibrous membrane were 9.923% and 534.4Pa higher than those of prepared by PLLA solution with DCM as solvent

respectively

in the same spinning time. When DCM or DCM/DMF was used as solvent

the flow behavior of PLLA solution was pseudoplastic. The stability and spinnability of PLLA solution prepared by the DMF/DCM mixed solvent were obviously improved than the PLLA solution prepared with only DCM as solvent

resulting in the finer fibers and the similar filtration efficiency

224.2Pa lower filtration resistance of fibrous membrane than those of prepared by PLLA solution with HFIP as solvent in the same spinning time.