| Electrospinning has become the only continuous to the preparation of polymer nanofibersdirectly and is also the most simple and effective method for the preparation of nanometer fiber.Because it has many advantages, For example, simple device、cheap manufacturing、easy tooperate、easy to control,etc. Electrospinning play a huge role in food, cosmetics, biomedicine,energy, filter material and other fields.This paper got PVA nanofibers membrane via electrospinning which made by differentmass fraction of PVA nanofibers.SEM photos were analyzed, and The results showed thediameter of the PVA fiber membrane increased with the increase of PVA mass fraction. WhenPVA mass fraction was12%,it had surface smooth fiber and uniform diameter distribution.Theaverage diameter was about270nm and the fiber morphology was the best. Crosslinked12%PVA nanofibers membrane by SEM photos showed uniform fiber diameter distribution and theaverage diameter was about120nm. The diameter of the crosslinked PVA nanofibers membranewas fine a lot. It showed that crosslinking had occurred in the process of experiment. Infraredspectrum analysis(IR) showed that in2776cm-1and2858cm-1two aldehyde absorption peaks.Itshowed that the crosslinking reaction also continued to happen. This also explained the differentcrosslinking time had effected on water imbibition and tensile experiments. Thermogravimetricanalysis showed that PVA nanofibers membranewith glutaraldehyde crosslinking treatment hada good thermal stability. Mechanical properties showed that when the crosslinking time was6h,rupture load of PVA nanofibers membrane was6.2N, but fracture length is reduced to18.2mm. Water absorption performance experiments showed that the crosslinking time was5h, thefiber membrane bibulous rate was885g/g at its maximum.In order to study the antibacterial film performance,This paper used silver nitrate asantibacterial agent and cross-linked with glutaraldehyde. PVA mass fraction of12%,14%and16%of the Ag/PVA nanofiber membranes was analyzed by SEM. It compared with PVAnanofibers membrane. when adding10%silver nitrate,fiber diameter reduced. SEM photo ofcrosslinking Ag/PVA nanofibers membrane shows thatthe diameter of the fiber also increasesgradually with the increasing mass fraction of PVA.when the PVA is12%, both not crosslinkingand crosslinking morphology is relatively good. The X-ray diffraction (XRD) results showedthatthe Ag+in the nano-fibers membranes was reduced to Ag0, and the crystal plane of Ag0implied the persistence silver phase, moreover, the XRD pattern proved that the after treatmentimproved the degree of crystallinity of PVA. Thermogravimetric analysis showed thatcrosslinking Ag/PVA nanofibers membrane weightlessness temperature was higher than Ag/PVA nanofibers membrane under the same weightlessness rate. Namely after crosslinking ofAg/PVA nanofibers membrane was more stable thermal performance. IR analysis showed thatthe crosslinking Ag/PVA nanofibers membrane had free O-H stretching vibration peak in the3623cm-1.It had not crosslinked completely.Crosslinking Ag/PVA nanofibers membrane made antibacterial performance testing usingescherichia coli and staphylococcus aureus bacteria as a test. The results showed that thecrosslinking PVA nanofibers membrane had no bacteriostasis on staphylococcus aureus andescherichia coli. Crosslinking Ag/PVA nanofibers membrane had bacteriostatic action onstaphylococcus aureus and escherichia coli. Ag/PVA nanofibers membrane for bactericidalefficiency of staphylococcus aureus is higher than escherichia coli through the measurement ofbacteriostatic circle. By the bactericidal kinetic testing,When the incubation time reached8h,the crosslinking Ag/PVA nanofibers membrane had the highest antibacterial rate for e. coli andstaphylococcus aureus. |
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