Manipulated Electrospun PVA Nanofibers with Inexpensive Salts

Ding, Wei; Wei, Suying; Zhu, Jiahua; Chen, Xuelong; Rutman, D. S.; Guo, Zhanhu

doi:10.1002/mame.201000188

Cited by 98 publications

(72 citation statements)

References 37 publications

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“…47,53−55 Indeed, this results in a higher charge density and ultimately in higher elongation forces experienced by the jet. The diameter of the obtained electrospun fibers also becomes essentially smaller, 53,54 which is also consistent with models predicting a decrease of the terminal radius, h t , of electrospun jets upon increasing the solution conductivity.…”

Section: Resultsmentioning

confidence: 99%

Bright Light Emission and Waveguiding in Conjugated Polymer Nanofibers Electrospun from Organic Salt Added Solutions

et al. 2013

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Light-emitting electrospun nanofibers of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(N,N′-diphenyl)-N,N′-di(p-butyl-oxy-phenyl)-1,4-diaminobenzene)] (PFO–PBAB) are produced by electrospinning under different experimental conditions. In particular, uniform fibers with average diameter of 180 nm are obtained by adding an organic salt to the electrospinning solution. The spectroscopic investigation assesses that the presence of the organic salt does not alter the optical properties of the active material, therefore providing an alternative approach for the fabrication of highly emissive conjugated polymer nanofibers. The produced nanofibers display self-waveguiding of light, and polarized photoluminescence, which is especially promising for embedding active electrospun fibers in sensing and nanophotonic devices.

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Section: Resultsmentioning

confidence: 99%

Bright Light Emission and Waveguiding in Conjugated Polymer Nanofibers Electrospun from Organic Salt Added Solutions

et al. 2013

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“…Endothermic peaks on PVA curve at 201.1 6 2.3 C correspond to the melting point. 36 But there was no obvious endothermic band observed on the curve of LBL films. The suppression and disappearance of melting point in the LBL films may be caused by the movement restriction of PVA chains that adsorbed or covalently bonded on the Laponite platelets.…”

Section: Mechanical and Thermal Properties Of The Lbl Assembly Filmsmentioning

confidence: 98%

Preparation and characterization of covalently bonded PVA/Laponite/HAPI nanocomposite multilayer freestanding films by layer‐by‐layer assembly

Ren

Guo

et al. 2015

J Polym Sci B Polym Phys

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The layer-by-layer (LBL) assembly technique is an attractive method to make functional multilayer thin films and has been applied to fabricate a wide range of materials. LBL materials could improve optical transmittance and mechanical properties if the film components were covalently bonded. Covalently bonded nanocomposite multilayer films were prepared by employing hydrophilic aliphatic polyisocyanate (HAPI) as the reactive component, to react with Laponite and polyvinyl alcohol (PVA). FT-IR spectra suggested that HAPI reacted with Laponite and PVA at ambient temperature rapidly. Ellipsometry measurement showed that the film thickness was in linear growth. The influences of HAPI on the optical, mechanical and thermal properties of the films were investigated by UV-Vis spectroscopy, tensile stress measurement, DSC and TGA. The obtained results showed that the optical transmittance and mechanical strength were enhanced when the film components were covalently bonded by HAPI. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 00, 000-000 KEYWORDS: covalently bonded; layer-by-layer; nanocomposites; self-assembly; thin films INTRODUCTION The layer-by-layer (LBL) assembly technique is an attractive method to make functional multilayer thin films and has been applied in the fabrication of nanodevice, drug release, and biomimetic materials.1-4 LBL multilayer films are more versatile in many aspects than bulk materials because they have more precisely controlled composition and structure at nanoscale dimensions. 5 Many researchers have investigated freestanding LBL films.6-8 However, the LBL ultrathin film breaks or decomposes easily during the application, which is one of the main shortages that hampers the application of the materials.9 Covalent assembly is an effective strategy for improving the physical or chemical properties of the LBL films.10-12 Another approach is achieved by introducing inorganic materials such as Laponite, montmorillonite and carbon nanotube into the LBL multilayer films. [13][14][15][16] Researchers have employed hydrogen bond, dipolar bond, or electrostatic attraction between polymer and inorganic particles to fabricate nanocomposite LBL multilayer films. 17,18 This type of physical interaction, however, often leads to unstable multilayer films in strong acid, strong alkali or high humidity conditions.

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“…These methods can be classified into three categories: (1) controlling process parameters (such as tip-to-collector distance, applied voltage, solution flow-rate and tempersture); (2) manipulating the intrinsic properties of electrospinning solutions (such as surface tension, conductivity and viscosity), which can be further classified into three sub-categories: reducing polymer concentration as low as possible, putting in additives such as salts and surfactants, and rising solutions temperature; (3) Altering the ambient conditions or with some assistant apparatuses, such as conducting the electrospinning process in a more humid closed chamber, in vacuum conditions and with an air-blow systems [1][2][3][4][5][6][7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Co-axial electrospinning with sodium thiocyanate solution for preparing polyacrylonitrile nanofibers

Yang

2012

J Polym Res

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A modified co-axial electrospinning process including electrolyte solution as sheath fluid for preparing high quality polymer nanofibers is investigated. A series of polyacrylonitrile (PAN) nanofibers were fabricated utilizing the modified process with sodium thiocyanate solutions in N, N-dimethylacetamide (DMAc) as sheath fluids. Fieldemission scanning electron microscopy results demonstrated that the sheath sodium thiocyanate solutions had significant influence on the quality of PAN nanofibers. High quality PAN nanofibers in terms of fiber diameters and their distributions, surface morphology and structure have been successfully produced. The diameters of nanofibers (D, nm) could be manipulated simply by adjusting the concentrations of sodium thiocyanate (C, mg ml -1 ) in the sheath fluids with a scaling law of D0324C -0.1806 . The mechanism about the influence of sodium thiocyanate solutions on the formation of PAN fibers is discussed and it is felt that co-axial electrospinning with electrolyte solution is a facile process for achieving high quality polymer nanofibers.

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Manipulated Electrospun PVA Nanofibers with Inexpensive Salts

Cited by 98 publications

References 37 publications

Bright Light Emission and Waveguiding in Conjugated Polymer Nanofibers Electrospun from Organic Salt Added Solutions

Bright Light Emission and Waveguiding in Conjugated Polymer Nanofibers Electrospun from Organic Salt Added Solutions

Preparation and characterization of covalently bonded PVA/Laponite/HAPI nanocomposite multilayer freestanding films by layer‐by‐layer assembly

Co-axial electrospinning with sodium thiocyanate solution for preparing polyacrylonitrile nanofibers

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