Quaternized amphiphilic block copolymers/graphene oxide and a poly(vinyl alcohol) coating layer on graphene oxide/poly(vinylidene fluoride) electrospun nanofibers for superhydrophilic and antibacterial properties
- Quaternized amphiphilic block copolymers/graphene oxide and a poly(vinyl alcohol) coating layer on graphene oxide/poly(vinylidene fluoride) electrospun nanofibers for superhydrophilic and antibacterial properties
- 이상협; 최재우; 김재현; 한치헌; 조계룡; 남아름; 박정안
- Issue Date
- Scientific Reports
- VOL 9, NO 383-13
- Poly(vinylidene fluoride) (PVDF) is common polymer for electrospinning, however, its high hydrophobicity is a major drawback, which cause fouling. To introduce hydrophilicity and antibacterial activity, quaternary ammonium-functionalized amphiphilic diblock copolymers were synthesized and blended with a PVDF/graphene oxide (GO) solution, then, electrospun and coated with a hydrophilic polymer, poly(vinyl alcohol) (PVA). The amphiphilic block copolymer, consisting of a hydrophobic poly(methyl methacrylate) block and a hydrophilic poly[N,N-2-(dimethylamino)-ethyl methacrylate) block (PMMA-b-PDMAEMA), was synthesized. Polymeric quaternary ammonium with three different alkyl chain lengths (C2, C4, and C8) were successfully introduced to obtain as q-PMMA-b-PDMAEMA. The q-PMMA-b-PDMAEMA in the nanofiber matrix was confirmed by C=O bands (1734 cm− 1) in the Fourier transform infrared spectra. Nano-sized spherical protuberances were distributed on the surface as revealed by field emission scanning and transmission electron microscopies. The PVDF/GO/q-PMMAb-PDMAEMA@PVA nanofibers has superhydrophilic properties (water contact angle = 0– 20°) and the pure water flux was generally improved by increasing the alkyl chain length. When introducing the longest alkyl chain (C8,OBC), the total fouling ratio was the lowest (49.99%) and the bacteria removal capacities after 60 min were the highest for both Escherichia coli (4.2 × 105 CFU/mg) and Staphylococcus aureus (6.1 × 105 CFU/mg) via growth inhibition and cytoplasmic membrane damage.
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