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1.
Electrospun web may possibly be widely applied to protective garments or specialty textiles due to its high level of protection
as well as comfort. Of particular interest in this study is to develop waterproof-breathable fabric by applying electrospun
web of polyurethane directly onto the substrate fabric. The optimal electrospinning condition was examined with regards to
the concentration, applied voltage and tip-to-collector distance. Solvent-electospinning of polyurethane was performed at
the optimum condition, using N,N-dimethylacetamide as solvent. The thickness of 0.02 mm of electrospun web was applied onto
the polyester/nylon blended fabric. For comparison, the polyester/nylon fabrics were coated with 0.02 mm thickness of polyurethane
resin membranes adopting four different conditions. The electrospun PU web/fabric was compared to resin coated fabrics in
terms of water-proof and breathable properties. The electrospun web applied fabric showed higher air permeability, vapor transmission,
and thermal insulation properties than resin coated fabrics, which can be translated as greater comfort sensation of electrospun
applied fabrics. However, water resistance value of electrospun web applied fabric did not reach that of resin coated fabrics. 相似文献
2.
The concept of phase separation was coupled with electrospinning to induce polyacrylonitrile (PAN) and polystyrene (PS) bicomponent
electrospun fibers that, upon removal of the phase-separated PS domains by solvent extraction, became nanoporous. Electrospinning
of PAN (Mw 150 kDa) with 5 % w/w PS (Mw 250 kDa) at a 10 % w/w total concentration in N,N-dimethylformamide (DMF) produced fibers with stable morphology and average diameters from 1130±680 to 890±340 nm by FESEM.
The nanoporous fibers made from a 95/5 w/w PAN/PS bicomponent precursor had internal pores of about 20∼110 nanometers. Pore
sizes of the porous PAN fibers were decreased to approximately ∼25 nm after oxidation and carbonization thermal treatment
because of fiber shrinkage during the thermal treatment. The fibers retained a high density of pores after the thermal treatment. 相似文献
3.
Byung-Soon Kim Hwan-Moon Song Chang-Soo Lee Seung-Goo Lee Young-A Son 《Fibers and Polymers》2008,9(5):534-537
In this study, quantum dots (QDs) having the photophysical properties of brightness, photostability and narrow emission were
synthesized. The electrospinning has been introduced to be a simple technique for generating ultrathin fibers. Herein, we
have synthesized QDs and electrospun polyvinylacetate (PVAc) nanofibers having these strongly luminescing QDs particles. The
size and morphology of QDs were recorded with transmission electron microscopy (TEM). The structural nanofiber webs have been
discussed by scanning electron microscopy (SEM). And fluorescence properties of strongly luminescing QDs nanofibers were also
discussed. 相似文献
4.
Layered fabric systems with electrospun polyurethane fiber web layered on spunbonded nonwoven were developed to examine the
feasibility of developing protective textile materials as barriers to liquid penetration using electrospinning. Barrier performance
was evaluated for layered fabric systems, using pesticide mixtures that represent a range of surface tension and viscosity.
Air permeability and water vapor transmission were assessed as indications of thermal comfort performance. Protection performance
and air/moisture vapor transport properties were compared for layered fabric systems and existing materials for personal protective
equipment (PPE). Layered fabric systems with electrospun nanofiber web showed barrier performance in the range between microporous
materials and nonwovens used for protective clothing. Layered fabric structures with the web area density of 1.0 and 2.0 g/m2 exhibited air permeability higher than most PPE materials currently in use; moisture vapor transport was in a range comparable
to nonwovens and typical woven work clothing fabrics. Comparisons of layered fabric systems and currently available PPE materials
indicate that barrier/transport properties that may not be attainable with existing PPE materials could be achieved from layered
fabric systems with electrospun nanofibrous web. 相似文献
5.
Application of electrospun silk fibroin nanofibers as an immobilization support of enzyme 总被引:1,自引:0,他引:1
Ki Hoon Lee Chang Seok Ki Doo Hyun Baek Gyung Don Kang Dae-Woo Ihm Young Hwan Park 《Fibers and Polymers》2005,6(3):181-185
Silk fibroin (SF) nanofibers were prepared by electrospinning and their application as an enzyme immobilization support was
attempted. By varying the concentration of SF dope solution the diameter of SF nanofiber was controlled. The SF nanofiber
web had high capacity of enzyme loading, which reached to 5.6 wt%. The activity of immobilizedα-chymotrypsin (CT) on SF nanofiber was 8 times higher than that on silk fiber and it increased as the fiber diameter decreased.
Sample SF8 (ca. 205 nm fiber diameter) has excellent stability at 25°C by retaining more than 90 % of initial activity after
24 hours, while sample SF11 (ca. 320 nm fiber diameter) shows higher stability in ethanol, retaining more than 45% of initial
activity. The formation of multipoint attachment between enzyme and support might increase the stability of enzyme. From these
results, it is expected that the electrospun SF nanofibers can be used as an excellent support for enzyme immobilization. 相似文献
6.
Gelatin is one of the most promising biomaterials due to its excellent biocompatibility and biodegradability. In order to
improve the antimicrobial activity of gelatin, gelatin nanofibers containing silver nanoparticles were prepared by electrospinning
gelatin/AgNO3/formic acid system, followed by UV irradiation. They were characterized by UV-visible spectroscopy, scanning electron microscopy,
transmission electron microscopy, and X-ray diffraction analysis. It was observed that the silver nanoparticles, which presented
quasi-sphere shaped and 9–20 nm average diameters, were generated on the surface of the gelatin nanofibers. The size of the
silver particles can be adjusted by changing the content of AgNO3. With increasing the amount of AgNO3, the average diameters of fibers decreased. The gelatin-Ag nanocomposites were found effective against Staphylococcus aureus and Pseudomonas aeruginosa. From these results, it is expected that the electrospun antimicrobial gelatin nanofiber mat can be used as an excellent
wound dressing. 相似文献
7.
Kwan?Woo?Kim Keun?Hyung?Lee Myung?Seob?Khil Yo?Seung?Ho Hak?Yong?KimEmail author 《Fibers and Polymers》2004,5(2):122-127
In this study, we evaluated the effect of the molecular weight of the polymer on electrospun poly(ethylene terephthalate)
(PET) nonwovens, and their mechanical properties as a function of the linear velocity of drum surface. Polymer solutions and
electrospun PET nonwovens were characterized by means of viscometer, tensiometer, scanning electron microscope (SEM), wide
angle X-ray diffraction measurement (WAXD) and universal testing machine (UTM). By keeping the uniform solution viscosity,
regardless of molecular weight differences, electrospun PET nonwovens with similar average diameter could be obtained. In
addition, the mechanical properties of the electrospun PET nonwovens were strongly dependent on the linear velocity of drum
surface. From the results of the WAXD scan, it was found that the polymer took on a particular molecular orientation when
the linear velocity of drum surface was increased. The peaks became more definite and apparent, evolving from an amorphous
pattern at 0 m/min to peaks and signifying the presence of crystallinity at 45 m/min. 相似文献
8.
In this study, we investigated the effect of tetraethylammoniumbromide (TEAB) salt on the spinnability of polyurethane nanofibers
via roller electrospinning method. At first, solution properties, spinnability and fiber properties were determined and then
all the results were analyzed. According to the results, TEAB salt concentration has an important effect on the conductivity,
viscosity, spinning performance, fiber diameter and morphology. It was found that all these parameters increased with salt
concentration. Also it was indicated that viscosity decreased with shear rate. Polyurethane including 1.82 wt % TEAB gives
the best spinning performance although 0.87 wt % TEAB is the optimum value related to fiber properties such as diameter, uniformity
and morphology given the ideal polyurethane nano web structure. 相似文献
9.
An allometrical scaling relationship between the diameter of electrospun nanofiber and solution concentration is established,
the scaling exponent differs greatly between different polymers and the same polymer with different molecules or the same
molecules with different properties. The diameter of electrospun polyacrylonitrile (PAN) nanofibers increases approximately
linearly with solution concentration. 相似文献
10.
A poly(acrylonitrile) (PAN) nano-web was electrospun on a commercial melt-blown poly(propylene) (PP) filter medium to generate
composite filter media. The performance of these media was characterized in terms of filtration efficiency and pressure drop.
Quality factors calculated from these parameters were used to evaluate the overall efficacy of the filter media. Structural
characterization of the composite media showed that a thin layer of nano-web could improve the overall performance by increasing
filtration efficiency without significant increase of pressure drop. 相似文献