| The growth of bacteria poses a threat to human health.Hospitals are also a collection of pathogenic bacteria.Therefore,it is particularly important to develop protective medical antimicrobial textiles with excellent performance.At present,such materials are not ideal.Their protective efficacy,production cost,and service life cannot meet people's requirements at the same time.The unique properties of nanofibers make it an irreplaceable material in the field of medical textiles.Based on this,the research and development of medical antibacterial textiles based on nanofiber membranes with excellent comprehensive performance showed good rejuvenation and antibacterial ability,and could effectively block bacteria,and had a good clinical application prospect.In this study,DMAEMA monomers were grafted onto the surface of nanofiber membranes by atom transfer radical polymerization(ATRP)and then Cu2+ was added to obtain a reversible antimicrobial nanofiber membrane.The grafting rate of butyryl bromide was 1.7%,the grafting ratio of DMAEMA was 18.4%,the average molecular weight of the grafted PDMAEMA was 1587 Da,and the copper ion adsorption capacity was 83 mg/g.After exposure of the sample membrane to the bacterial suspension for 90 min,the copper ion content in the water increased from 0.01 ?g/ml to 1.87 ?g/ml;the copper ion content in the water before and after filtration as the bacterial barrier was increased from 0.01 ?g/ml to 0.02 ?g/ml.The copper content in water is in line with drinking standards.The antibacterial rates of the sample membrane against S.aureus and E.coli were 97.74% and 95.33%,respectively,and the rejection was 95.29% and 96.92%,respectively,proving that the sample membrane could provide users with Effective bacterial protection.Ten antibacterial rejuvenation treatments were performed on the sample membrane.The inhibition rate and rejection rate of S.aureus and E.coli were above 95%.The excellent antibacterial rejuvenation ability enables the sample membrane to have more effective antibacterial times,thereby facilitating its maximum application in the field of medical antibacterial textiles.In order to simplify the preparation process and reduce the production cost,the cotton fabric sprayed with the nanofiber membrane is further impregnated into a polyethylenimine(PEI)aqueous solution and adsorbed on the surface of the composite membrane,Cu2+ is blended and a rejuvenated composite antibacterial textile is obtained.The PEI load rate was 24% and the copper ion adsorption capacity was 104 mg/g.After exposure of the sample membrane to the bacterial suspension for 300 min,the copper ion content in the water increased from 0.01 ?g/ml to 1.95 ?g/ml;the content of copper ion in the water before and after the bacterial barrier filtration was unchanged at 0.01 ?g/ml,and the above copper content was consistent Drinking standards.The ability of the sample membrane to resist deformation after the composite cotton fabric increases,and thus meets the actual clinical application requirements.The inhibition rates of the sample membrane against S.aureus and E.coli were 98.73% and 97.24%,respectively,and the rejection rates were 97.56% and 96.28% respectively,indicating that the sample membrane could be effectively avoided.The germs are in direct or indirect contact with the human body.22 times of antibacterial rejuvenation treatment was performed on the sample membrane.The antibacterial and rejection rates of the sample membrane against S.aureus and E.coli were all above 96%.The excellent antibacterial rejuvenation ability of the cotton fabric composite membrane made it in use.Zhongneng has a lower cost of use so that it can be applied to more fields.Compared with surface graft polymerization process,this study significantly simplifies the preparation process under the premise of maintaining good antibacterial ability and resurrecting effect,and the composite with pure cotton fabric is more conducive to clinical popularization and application. |
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