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Title: Antibacterial activities of surface modified electrospun poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) fibrous membranes
Authors: Yao, C.
Li, X.
Neoh, K.G. 
Shi, Z. 
Kang, E.T. 
Keywords: Antibacterial
Poly(vinylidene fluoride-co-hexafluoropropylene)
Surface modification
Issue Date: 1-Jan-2009
Source: Yao, C., Li, X., Neoh, K.G., Shi, Z., Kang, E.T. (2009-01-01). Antibacterial activities of surface modified electrospun poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) fibrous membranes. Applied Surface Science 255 (6) : 3854-3858. ScholarBank@NUS Repository.
Abstract: Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) membrane, with its excellent chemical and mechanical properties, has good potential for broad applications. However, due to its hydrophobic nature, microbial colonization is commonly encountered. In this work, electrospun PVDF-HFP fibrous membranes were surface modified by poly(4-vinyl-N-alkylpyridinium bromide) to achieve antibacterial activities. The membranes were first subjected to plasma pretreatment followed by UV-induced surface graft copolymerization of 4-vinylpyridine (4VP) and quaternization of the grafted pyridine groups with hexylbromide. The chemical composition of the surface modified PVDF-HFP electrospun membranes was studied by X-ray photoelectron spectroscopy (XPS). The morphology and mechanical properties of pristine and surface modified PVDF-HFP fibrous membranes were characterized by scanning electron microscopy (SEM) and tensile test, respectively. The antibacterial activities of the modified electrospun PVDF-HFP fibrous membranes were assessed against Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli). The results showed that the PVDF-HFP fibrous membranes modified with quaternized pyridinium groups are highly effective against both bacteria with killing efficiency as high as 99.9999%. © 2008 Elsevier B.V. All rights reserved.
Source Title: Applied Surface Science
ISSN: 01694332
DOI: 10.1016/j.apsusc.2008.10.063
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