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Effect of solvent volatility on diameter selection of bicomponent nanofibers produced by gas jet fiber process test / S. S. Rajgarhia in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 5 (11/2017)
[article]
Titre : Effect of solvent volatility on diameter selection of bicomponent nanofibers produced by gas jet fiber process test Type de document : texte imprimé Auteurs : S. S. Rajgarhia, Auteur ; Sadhan C. Jana, Auteur Année de publication : 2017 Article en page(s) : p. 582-589 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Core-Shell
Evaporation
Fibres textiles bi-composant
Fibres textiles synthétiques
Nanofibres
Production
Réseaux polymères
Rhéologie
Solutions de polymère
solvants
ViscositéIndex. décimale : 668.4 Plastiques, vinyles Résumé : This paper addresses the role of solvent volatility on diameter selection of bicomponent polymer nanofibers produced via gas jet fibers (GJF) process whereby an axisymmetric turbulent gas jet is used for liquid jet initiation, liquid jet stretching, and solvent evaporation. Several morphological forms, such as interpenetrating network (IPN), bi-lobal, and core-shell are obtained by spinning homogeneous solutions of two immiscible polymers in two mutually miscible solvents. The diameter selection of fibers of the same morphology, e. g., bi-lobal, is achieved by spinning polymer solutions of two sets of solvents of different volatility. The results show that fiber diameter is strongly dependent on the value of vapor pressure of the solvents while the morphology is strongly dependent on the vapor pressure difference of the two respective solvents. The diameter selection by GJF process is most prominent for IPN nanofibers, moderately prominent for core-shell fibers, and almost indifferent for bi-lobal nanofibers. The relative rates of solvent evaporation are useful in interpreting the experimental trend. Note de contenu : - EXPERIMENTAL SECTION : Materials - Measurement of shear viscosity - Sample preparation - Method of fiber production - Fiber characterization - Fiber diameter - Evaporation time of the solvents
- RESULTS AND DISCUSSION : Fibers with IPN morphology - Fibers with bi-lobal morphology - Fibers with core-shell morphologyDOI : 10.3139/217.3453 En ligne : https://drive.google.com/file/d/1_Ebdocr2-JzpktuFq9jSVVp41zFbUi0X/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29425
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 5 (11/2017) . - p. 582-589[article]Réservation
Réserver ce documentEffects of polymer viscosity and nanofillers on morphology of nanofibers obtained by a gas jet method / J.-H. Shang in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 1 (03/2014)
[article]
Titre : Effects of polymer viscosity and nanofillers on morphology of nanofibers obtained by a gas jet method Type de document : texte imprimé Auteurs : J.-H. Shang, Auteur ; R. E. Benavides, Auteur ; Sadhan C. Jana, Auteur Année de publication : 2014 Article en page(s) : p. 103-111 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux)
Morphologie (matériaux)
Nanofibres
Nanoparticules
Nanotubes de carbone à parois multiplesUn nanotube de carbone multifeuillet est constitué de plusieurs feuillets de graphènes enroulés les uns autour des autres. Il existe deux modèles pour décrire la structure des nanotubes multifeuillets :
- le modèle poupée russe: les plans de graphène sont arrangés en cylindres concentriques ;
- le modèle parchemin: un seul feuillet de graphène est enroulé sur lui-même, comme une feuille de papier.
Poids moléculaires
Polyacétate de vinyle
Polyéthylène glycol
Polymères en émulsion
Polyvinylpyrrolidone
ViscositéIndex. décimale : 668.4 Plastiques, vinyles Résumé : This research evaluates the effects of molecular weight, polymer solution concentration, and carbon nanotube concentration on diameter distribution of polymer nanofibers produced with gas jet fiber (GJF) method. In GJF method, the shear and extensional forces of high-velocity gas jets are used to spin fibers from polymer solutions. The correlation between polymer molecular weight and fiber diameter distribution is studied along with the effect of multi-walled carbon nanotubes (MWCNT) on fiber diameter distribution. The paper also assesses how carbon nanotubes distribute in bi-component polymer nanofibers. It is found that polymer chain entanglement is a key determinant of fiber diameter. MWCNTs do not show preference for distribution in polyvinylidene pyrrole (PVP) and polyvinylacetate (PVAc) and instead appear on the surfaces of the fibers. A negative value of spreading coefficient supports this observation. Note de contenu : - Diameter and morphology of PEO nanofibers and microfibers by GJF method
- Effects of carbon nanotubes on single component polymer nanofibers
- Distribution of carbon nanotubes in bi-component polymer nanofibersDOI : 10.3139/217.2817 En ligne : https://drive.google.com/file/d/1wQGdWi-sDRXkW_ozpB3zMqdRxLSKRYqW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20581
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 1 (03/2014) . - p. 103-111[article]Réservation
Réserver ce documentInvestigation of microstructure and air permeability of aerogel-coated textile fabric materials / A. Fonner in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)
[article]
Titre : Investigation of microstructure and air permeability of aerogel-coated textile fabric materials Type de document : texte imprimé Auteurs : A. Fonner, Auteur ; Sadhan C. Jana, Auteur Année de publication : 2021 Article en page(s) : p. 322-331 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aérogels
Air
Caractérisation
Enduction textile
Filtration
Matériaux poreux
Microstructures -- Analyse
Perméabilité
Polyesters
Polyimides
Polystyrène
Séchage
Textiles et tissus synthétiquesIndex. décimale : 668.4 Plastiques, vinyles Résumé : This study focuses on fabrication of aerogel-coated macroporous polyester fabrics for the purposes of filtration of nanometric airborne particles and potential application in facemasks. Syndiotactic polystyrene (sPS) and polyimide (PI) gels that provide respectively majority macropores (diameter > 50 nm) and mesopores (diameter 2 to 50 nm) are coated onto woven polyester fabrics via a dip coating process. The resultant materials are supercritically dried to obtain aerogelcoated fabrics. The results show that sPS is more suitable for the dip coating process. However, evaporation of the solvent during handling of gel-coated fabrics leads to closure of the surface pores that are later recovered via solvent annealing. The resultant aerogel-coated fabrics offer high air permeability (∼10–10 m2) and high filtration efficiency (> 99.95%) of airborne sodium chloride test particles of size 25 to 150 nm. Note de contenu : - EXPERIMENTAL : Materials - Preparation of sol - Preparation of aerogel-coated fabric - Supercritical drying - Characterization - Air permeability and filtration efficiency
- RESULTS AND DISCUSSION : Quality of aerogel-coated fabric substrates - Aerogel coating thickness - Density and porosity - Specific surface area and porosity - Permeability - Effects of solvent annealing
- Table 1 : Thickness of sPS aerogel coating as function of retraction rate from solution followed by drying for 3 min
- Table 2 : BET surface area and pore fractions
- Table 3 : Air permeability and filtration efficiency
- Table 4 : Effect of annealing in THF vapor on fabric thickness
- Table 5 : Density and porosity data of solvent annealed specimens
- Table 6 : Surface area and pore volume fraction of annealed aerogelcoated fabric
- Table 7 : Permeability values of annealed aerogel coated fabric and commercially available personal filtration devicesDOI : https://doi.org/10.1515/ipp-2020-4095 En ligne : https://drive.google.com/file/d/1PQEzJCBqaEWmWWTzTat875yHMb-Pl-W2/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36374
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 322-331[article]Réservation
Réserver ce documentA surfactant-free microfluidic process for fabrication of multi-hollow polyimide aerogel particles / Y. M. Yao in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 5 (11/2020)
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Titre : A surfactant-free microfluidic process for fabrication of multi-hollow polyimide aerogel particles Type de document : texte imprimé Auteurs : Y. M. Yao, Auteur ; P. Joo, Auteur ; Sadhan C. Jana, Auteur Année de publication : 2020 Article en page(s) : p. 481–492 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aérogels
Caractérisation
Corps creux
Granulométrie
Isolation thermique
Microfluidique
Particules (matières)
Polyimides
Polymères en émulsionIndex. décimale : 668.4 Plastiques, vinyles Résumé : This work focuses on fabrication of multi-hollow polyimide gel and aerogel particles from a surfactant-free oil-in-oil emulsion system using a microfluidic droplet generator operating under dripping mode. The multi-hollow gel and aerogel particles have strong potential in thermal insulation. Under jetting and tip-streaming regime of microfluidic flows, droplets are generated with no occluded liquid phase. The present study investigates a means of designing polyimide gel particles with plurality of internal liquid droplets by strategically manipulating the flow rates of the continuous and dispersed phase liquids through the microfluidic droplet generator. The multi-hollow polyimide aerogel particles obtained after supercritical drying of the gel particles present mesopores, high BET surface area, and excellent prospect for thermal insulation. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of polyimide sol - Preparation of the multi-hollow polyimide aerogel particles - Characterization of multi-hollow polyimide aerogel particles
- RESULTS AND DISCUSSION : Role of the ratio Qd and Qc on droplet generation - Gel and aerogel particle size distributions - The morphology of multi-hollow polyimide aerogel particles - The time window for droplet generation - Analysis of polyimide droplet formation with multiple internal droplet inclusions - Monitoring of imidization and thermal properties - Surface area and porosity - Thermal insulationDOI : https://doi.org/10.3139/217.3989 En ligne : https://drive.google.com/file/d/17Bcp9-Rsz-2U-UVpLOr-RvQ4MChCOZO5/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35070
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 5 (11/2020) . - p. 481–492[article]Réservation
Réserver ce documentSurfactant-free oil-in-oil emulsion-templating of polyimide aerogel foams / Erin Farrell in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 4 (2022)
[article]
Titre : Surfactant-free oil-in-oil emulsion-templating of polyimide aerogel foams Type de document : texte imprimé Auteurs : Erin Farrell, Auteur ; Sadhan C. Jana, Auteur Année de publication : 2022 Article en page(s) : p. 427-441 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aérogels
Caractérisation
Emulsions
Emulsions -- Stabilité
Gélification
Matériaux mésoporeux
Matériaux poreux
Modèles mathématiques
Mousse (chimie)
PolyimidesIndex. décimale : 668.4 Plastiques, vinyles Résumé : A surfactant-free oil-in-oil emulsion-templating method is presented for fabrication of monolithic polyimide aerogel foams using monomer systems that produce fast sol–gel transition. An aerogel foam is a high porosity (∼90%) material with coexisting meso- and macropores inherent to aerogels with externally introduced micrometer size open cells (macrovoids) that are reminiscent of foams. The macrovoids are introduced in polyimide sol using surfactant-free emulsion-templating of droplets of an immiscible liquid that are stabilized against coalescence by fast sol–gel transition. Three immiscible liquids – cyclohexane, n-heptane, and silicone oil – are considered in this work for surfactant-free emulsion-templating. The aerogel foam monoliths, recovered by supercritical drying, exhibit smaller size macrovoids when n-heptane and cyclohexane are used as emulsion-templating liquid, while the overall porosity and the bulk density show weak dependence on the emulsion-templating liquid. Note de contenu : - EXPERIMENTAL SECTION : Materials - Characterization
- RESULTS AND DISCUSSION : Emulsion stability - Gel times - Aerogel foam materials - BET surface area - Macrovoid and pore architecture
- Table 1 : Lists several properties of the solvents used.
- Table 2 : Interfacial tension values without surfactant
- Table 3 : Mean, median, maximum, and minimum droplet diameter in surfactant-free emulsions in N,N-dimethylformamide
- Table 4 : Droplet distribution data and mean diameter in micrometer in each size range
- Table 5 : Emulsion separation times and creaming rates in polyimide so
- Table 6 : Bulk density, shrinkage, porosity, and percent pores in macro- and mesopore range of emulsion-templated polyimide aerogel foams
- Table 7 : BET surface areaDOI : https://doi.org/10.1515/ipp-2022-4248 En ligne : https://drive.google.com/file/d/1_xRc5_bNKiT5U2NT_gxrCiSs-qCRpbw0/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37918
in INTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 4 (2022) . - p. 427-441[article]Réservation
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