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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
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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
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Journal Article
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
2019
Overview
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 (C
2
, C
4
, and C
8
) 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
-PMMA-
b
-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 (C
8,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 × 10
5
CFU/mg) and
Staphylococcus aureus
(6.1 × 10
5
CFU/mg) via growth inhibition and cytoplasmic membrane damage.
Publisher
Springer Science and Business Media LLC,Nature Publishing Group UK,Nature Publishing Group
Subject
/ Ammonium
/ Anti-Bacterial Agents - chemistry
/ Anti-Bacterial Agents - pharmacology
/ Coated Materials, Biocompatible
/ Coated Materials, Biocompatible - chemistry
/ Coated Materials, Biocompatible - pharmacology
/ E coli
/ Escherichia coli - growth & development
/ Fouling
/ Graphite
/ Humanities and Social Sciences
/ Hydrophobic and Hydrophilic Interactions
/ Polymers
/ Polyvinyl Alcohol - chemistry
/ Polyvinyl Alcohol - pharmacology
/ Science
