Electrospun Polyoxymethylene: Spinning Conditions and Its Consequent Nanoporous Nanofiber

Kongkhlang, Thontree; Kotaki, Masaya; Kousaka, Yasushi; Umemura, Tomonari; Nakaya, Daigo; Chirachanchai, Suwabun

doi:10.1021/ma800731r

Cited by 76 publications

(80 citation statements)

References 28 publications

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“…The high boiling point of DMF and high viscosity of HFIP solution might suppress phase separation during the solvent evaporation. 10 Surface modification of the electrospun nonwoven nanofiber mat was conducted by surface-initiated copper-catalyzed ATRP of hydrophilic DMAPS in methanol/water (14/86, v/v) solution at 30°C for 3 h and hydrophobic FA-C 8 in a bulk state at 60°C for 3 h (Scheme 1).…”

mentioning

confidence: 99%

Preparation and Surface Characterization of Surface-modified Electrospun Poly(methyl methacrylate) Copolymer Nanofibers

et al. 2010

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We developed a surface modification of electrospun nonwoven nanofiber mat by surface-initiated atom transfer radical polymerization (ATRP). Nanofibers of poly(methyl methacrylate)-co-poly[2-(2-bromoisobutyryloxy)ethyl methacrylate] were prepared by electrospinning to form a nonwoven nanofiber mat containing bromoalkyl groups, which initiated ATRP of 3-[dimethyl(methacryloyloxyethyl)ammonio]propanesulfonate (DMAPS) and 2-(perfluorooctyl)ethyl acrylate (FA-C 8 ), respectively, without deformation of nanofiber structure. The surface of the obtained electrospun nonwoven nanofiber mat was characterized by XPS, SEM, AFM, and contact angle measurement before and after surface modification.Functional nanofiber is expected to have many applications in various fields including environmental, medical, and nanosciences, 1,2 and preparation methods have been actively researched. Electrospinning is one facile method to prepare fibers from nano to submicro order size. Many types of solvents can be used for electrospinning, and nanofibers can be prepared under normal air pressure at room temperature. Therefore, electrospinning is one of the most attractive nanofiber preparation method. 3,4 In this study, we propose a novel surface modification of nanofibers combined with electrospinning and surface-initiated atom transfer radical polymerization (ATRP). The authors reported the precise control of surface properties of polymers by direct surface-initiated ATRP from polymer surface with halogen groups. 5,6 We introduced 2-(2-bromoisobutyryloxy)-ethyl methacrylate (BIEM) as an initiator comonomer. BIEM has a bromoalkyl group on the side chain, which can initiate ATRP (Scheme 1). The obtained PMMA-co-PBIEM possesses sufficient ATRP initiating points to generate densely grafted chains compared with conventional bromo-terminated polymer.7 Therefore, our method can be expected to improve the grafting density of polymer on the nanofiber surface. We evaluated the detailed physical properties and morphologies of the electrospun nanofibers before and after surface modification and discussed wettability change of the nanofiber mats by surface modification.PMMA-co-PBIEM was synthesized by free radical copolymerization with AIBN. The composition of the copolymer was PMMA/PBIEM = 16/1 (mol) estimated from the 1 H NMR spectrum. The number-average molecular weight M n and PDI were 179000 and 1.99, respectively.Nanofibers of PMMA-co-PBIEM were fabricated on a Siwafer substrate by electrospinning from 7.5% copolymer solution of DMF and hexafluoro-2-propanol (HFIP) using NANON-01A (MECC Co., Ltd.). Figure 1a shows a SEM image of nanofibers prepared from PMMA-co-PBIEM HFIP solution. The diameter of fiber was approximately 850 nm («190 nm). Surface morphology and diameter of nanofibers are largely dependent on the polymer concentration and the solvent. For instance, electrospinning using chloroform solution of the copolymer also afforded nanofibers. However, porous structure was formed on the nanofiber surface due to the phase separation induced by r...

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confidence: 99%

Preparation and Surface Characterization of Surface-modified Electrospun Poly(methyl methacrylate) Copolymer Nanofibers

et al. 2010

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“…It was also reported that the oxyethylene units in the polyacetal copolymer decreased the nanofi ber surface roughness and porosity, leading to a signifi cant change in the specifi c surface area, as presented on Figure 14.34 [121]. Moreover, a decrease in nanoporosity could be achieved under a decrease of solvent vapor pressure, an increase of spinning voltage, and a decrease of relative humidity.…”

Section: Pom Nanostructures -Electrospun Pom Nanofi Bersmentioning

confidence: 82%

“…34 Scanning electron micrographs of the electrospun POM nanofi bers from an HFIP solution with copolymer contents of (a) 0, (b) 1.5, (c) 4.4, and (d) 13 wt% (electrostatic fi eld strength ) 15 kV/10 cm and relative humidity (75%)[121].…”

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confidence: 99%

Nanocomposites of Polyoxymethylene

Leszczyńska¹,

Pielichowski²

2014

Polyoxymethylene Handbook

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Recent research results in the area of nanocomposites and nanostructured materials based on polyoxymethylene (POM) are reviewed in this chapter. Improvement of diff erent properties, such as mechanical strength, electrical conductivity, tribological properties, thermal stability and biocompatibility, are reported for these new POM-based materials, which indicate their high potential in structural and functional applications. As nanofi llers for POM-layered silicates, fullerenes, carbon nanotubes and nanofi bers, polysilsesquioxanes (POSS), nanostructural hydroxyapatite or nanoparticulate oxides such as titanium dioxide, nanosilica, zirconium oxide and zinc oxide, are applied. Nanocomposites based on POM and diff erent types of nanofi llers reveal superior properties compared to conventional POM composites, but the amount of additive remains lower. Th e infl uence of nanofi ller type, manufacturing techniques, role of interfacial properties and kind of applied surface modifi cation of nanoparticles on the control of generated nanostructure is discussed. Moreover, complex morphology and properties of electrospun POM nanofi bers are analyzed with respect to the nanomaterials manufacturing conditions.

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“…The decrease in the surface temperature for the polymer solution would lead to thermally induced phase separation. [31][32][33] Second, the condensation of atmospheric moisture may have induced phase separation. This moisture would condense at the outermost surface of the sprayed polymer solution as its surface temperature decreases.…”

Section: Results and Discussion Preparation Of The Electrospun Non-womentioning

confidence: 99%

Precise control of surface physicochemical properties for electrospun fiber mats by surface-initiated radical polymerization

Yano

Yah

Yamaguchi

et al. 2011

Polym J

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Non-woven fiber mats were fabricated with the electrospinning method using poly(methyl methacrylate)-co-poly(2-(2-bromoisobutyryloxy)ethyl methacrylate) in various solvents. The surface morphology of the electrospun fibers depended on the solvent vapor pressure and polymer concentration. Surface-initiated atom transfer radical polymerization (ATRP) with 3-(N-2-methacryloyloxyethyl-N,N-dimethyl) ammonatopropanesulfonate), 2-hydroxyethyl methacrylate or 2-(perfluorooctyl)ethyl acrylate generated surface-grafted polymers, as determined by X-ray photoelectron spectroscopy. Scanning electron microscopic observation revealed that the apparent fiber morphology did not change upon modification. The atomic force microscopic images of the grafted fiber cross-sections indicated that monomers and solvents penetrated slightly into the fibers and polymerization occurred at both internal and external initiation sites. Physicochemical properties, such as contact angle, hydrophobicity and hydrophilicity, and wettability, could be altered by the proper selection of substrates (spin-coated flat films or the variously prepared non-woven fiber mats). We have successfully prepared hydrophilic and hydrophobic fiber surfaces by a combination of the electrospinning protocol and surface-initiated ATRP.

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Electrospun Polyoxymethylene: Spinning Conditions and Its Consequent Nanoporous Nanofiber

Cited by 76 publications

References 28 publications

Preparation and Surface Characterization of Surface-modified Electrospun Poly(methyl methacrylate) Copolymer Nanofibers

Preparation and Surface Characterization of Surface-modified Electrospun Poly(methyl methacrylate) Copolymer Nanofibers

Nanocomposites of Polyoxymethylene

Precise control of surface physicochemical properties for electrospun fiber mats by surface-initiated radical polymerization

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