Fabrication of multifunctional antibacterial polypropylene via layer-by-layer assembly for potential application in...

The spread of the global epidemic continues to pose a serious threat, and the vast consumption of disposable polypropylene (PP) nonwoven medical protective suits presents significant environmental challenges. Therefore, the development of reusable, antibacterial PP nonwovens holds significant importance. This research presents a multifunctional PP exhibiting bacteria-killing, bacteria-releasing, and anti-bacteria adhesion, fabricated through layer-by-layer assembly utilizing modified sodium carboxymethylcellulose (CMC) and chitosan quaternary ammonium (CTS-QAS). Evaluations demonstrate that the modified PP nonwoven eliminated 99.33 % of Staphylococcus aureus (S. aureus) and 99.95 % of Escherichia coli (E. coli) in 0.5 h. Remarkably, near complete eradication of both S. aureus and E. coli within was observed in 1 h, indicating rapid antibacterial ability. Simultaneously, the material effectively inhibited bacterial attachment and facilitated the release of adhered bacteria through the thermal responsiveness of PNIPAM molecular chains. Furthermore, the modified PP nonwoven demonstrated excellent storage and wash stability, biocompatibility, and rechargeability. Therefore, the modified PP nonwoven holds considerable promise for application in reusable medical protective suits.