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Development of low cost degradable polyester fibers / C. C. Lam in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 1 (03/2016)
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Titre : Development of low cost degradable polyester fibers Type de document : texte imprimé Auteurs : C. C. Lam, Auteur ; Winnie Wu, Auteur Année de publication : 2016 Article en page(s) : p. 25-28 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Mélanges-maîtres (chimie)
Nontissés
Oxobiodégradation
Polyesters
Polyéthylène téréphtalate
Polymères -- Effet du rayonnement ultraviolet
Polymères -- BiodégradationIndex. décimale : 677.4 Textiles artificiels Résumé : Transition metal pro-oxidants formula for degradable polyester has been successfully developed and is applicable for nonwovens sheets production. With the masterbatch concept and technology, manufacturers interested in degradable products can simply introduce the degradable masterbatch into their existing production process. The approach is cost effective since no additional equipment and investment are involved. The estimated extra expense of the degradable nonwovens production is mainly from the pro-oxidants, and it is anticipated that the total cost will only increase 3-5%, while the market price of degradable products could be around 10-300% higher than the traditional ones. However, by using this technology, functional advantages of synthetic fibers such as high wear resistance and low moisture absorption properties could also be maintained, the disposable and degradable synthetic fibers can be applied to manufacture of disposable health and medical products such as hairnet, mask, isolation gown etc. It could also be extended to produce other degradable nonwovens materials such as filters which have specific expiration dates and need to be replaced periodically. En ligne : https://drive.google.com/file/d/1fMLNXOukaOZWfZCFCXNzG8pFlu37lw1W/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25840
in CHEMICAL FIBERS INTERNATIONAL > Vol. 66, N° 1 (03/2016) . - p. 25-28[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18021 - Périodique Bibliothèque principale Documentaires Disponible Spider silk : ancient biomaterial for functional textiles / Amit Sengupta in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 1 (03/2016)
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Titre : Spider silk : ancient biomaterial for functional textiles Type de document : texte imprimé Auteurs : Amit Sengupta, Auteur ; Jagadananda Behera, Auteur Année de publication : 2016 Article en page(s) : p. 28-30 Langues : Anglais (eng) Catégories : Biomatériaux
Soie d'araignéeLes fibres de soie sont formées de fibroïnes (protéines filamenteuses, appelées aussi spidroïnes2, composées de copolymères à blocs hydrophiles et hydrophobes) constituées à 25-30 % d'alanine et à 40% de glycine.
La soie d'araignée est un polymère dont la configuration moléculaire peut varier et rapidement s'adapter à la température et à l'humidité, ce qui fascine les chercheurs en biomimétique ou en robotique.
La soie d'araignée est notamment capable de « Supercontraction » (de 10 à 140 MPa de tension) quand elle s'humidifie (en plusieurs minutes quand l'hygrométrie dépasse 70 %), et plus rapidement quand elle est subitement mouillée. C'est ainsi que les toiles peuvent résister à la pluie, et au poids de la rosée voire accumuler plusieurs grammes d'eau sous forme de gouttes, à partir de la bruine par exemple. La thermostabilité varie aussi selon le degré de supercontractionIndex. décimale : 677.39 Soie Résumé : Pound for Pound, spider silk is the toughest fiber in the world rivaling even steel. Spider silk is also known as gossamer. A single spider can produce up to seven different varieties of silk. Some are stiff and strong, acting like girders to hold up a web. Others are extremely elastic or sticky to entangle prey. Strength in combination with elasticity makes spider silk amazing. These qualities alone would make an impressive fabric. The egg cases may even block ultraviolet light and, unlike certain kinds of spider silk, resist shrinkage. Knowing the protein structure and how a spider's spinneret works helps the scientists to create synthetic artificial silk. Synthetic proteins are currently being produced in a variety of genetically altered organisms, and companies and universities alike are investigating spinning processes. Note de contenu : - Types of spider silk and its uses
- Physical properties
- Attempts at producing synthetic spider silk
- Applications
- TABLES : 1. Type of glands, silks and their functions - 2. Physical properties of various fibersEn ligne : https://drive.google.com/file/d/1h3mmJ-FzRbgy4phxEunm5YN07mpjjK_Z/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25841
in CHEMICAL FIBERS INTERNATIONAL > Vol. 66, N° 1 (03/2016) . - p. 28-30[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18021 - Périodique Bibliothèque principale Documentaires Disponible Novel process for spinning polyacrylonitrile fibers / Frank-Günter Niemz in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 1 (03/2016)
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Titre : Novel process for spinning polyacrylonitrile fibers Type de document : texte imprimé Auteurs : Frank-Günter Niemz, Auteur ; Thomas Schulze, Auteur Année de publication : 2016 Article en page(s) : p. 33-35 Langues : Anglais (eng) Catégories : Fibres textiles synthétiques
Filature
Liquides ioniques
PolyacrylonitrileIndex. décimale : 677.4 Textiles artificiels Résumé : The presented results deal with scientific, experimental and technical aspects of the development of a novel fiber spinning technology for polyacrylonitrile (PAN) dissolved in ionic liquids. Beside procedural investigations covering the variation of fiber forming conditions in spinneret, in coagulation baths and in different after-stretching steps, the complex influence of parameters on fiber properties in gel as well as dried state is in the main locus. In this way, individual fiber tenacities of more than 75 cN/tex and elongation values of 8-15% have been obtained. Note de contenu : - Preparation of spinning solutions
- Fiber preparation
- Fiber spinning
- Preparation of dried PAN precursor filaments
- FIGURES : 1. Cations and anions for designing ionic liquids useful for preparing polyacrylonitrile solutions - 2. Viscosity curves in dependence on shear conditions taken from a solution of 25% PAN in a PRIF at 85°C - 3. Scanning electron microscopic image of fibers spun from PRIF-solutions (cross-section and surface details - 4. Maximum allowed draw ratio as a function of PAN concentration
- TABLES : 1. Textile-physical values of PAN fibers spun from 25 wt% solution in coagulation bathes of different concentrations - 2. Filament properties before and after thermal stretching - 3. Debye-Scherrer-WAXS-images of aligned PAN fiber samples at different after-stretching ratiosEn ligne : https://drive.google.com/file/d/1na07TEJd0XG5xyH5Yq5tLYVT_ARCQ71E/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25844
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Code-barres Cote Support Localisation Section Disponibilité 18021 - Périodique Bibliothèque principale Documentaires Disponible Light diffraction used as optical instrument to measure texturing of filament yarns / Eric Schulte Südhoff in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 1 (03/2016)
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Titre : Light diffraction used as optical instrument to measure texturing of filament yarns Type de document : texte imprimé Auteurs : Eric Schulte Südhoff, Auteur ; Lukasz Debicki, Auteur ; Michael Decius, Auteur ; Lukas Merten, Auteur ; Volker Niebel, Auteur ; Gunnar Seide, Auteur ; Thomas Gries, Auteur Année de publication : 2016 Article en page(s) : p. 37-39 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Diffraction
FilamentsFibre de longueur infinie ou extrême comme celle qu'on trouve dans la soie à l'état naturel. Les fibres manufacturées sont extrudées en filaments qui sont transformés en fils continus, en fibres courtes ou en câbles.
Lumière visible
Mesures optiques
TexturationProcédé de frisure, conférant des boucles au hasard, ou modifiant d'une autre manière un fil de filament continu afin d'augmenter son pouvoir couvrant, sa résilience, sa résistance à l'abrasion, sa chaleur, son pouvoir d'isolation thermique, son pouvoir d'absorption d'humidité, ou pour lui donner une texture de surface différente. Les procédés de texturation peuvent être regroupés en six catégories.Index. décimale : 677 Textiles Résumé : Non-textured filament yarns tend to exist side by side in a parallel and even way. The surface is smooth compared to the less uniform and hairy surface of staple fiber yarns. For many applications staple fiber specific properties are desirable with retention of the continuity of a filament at the same time. Through texturing the filament yarns obtain customizable properties such as high bulk, high elasticity and porosity. The properties of textured filament yarns are currently measured offline in the laboratory. Online optical methods for the characterization of filament yarns on the running yarn do not exist. Offline measurement methods are costly and generate only statistical information on the quality of the yarn by random sampling. Besides the state-of-the-art of the measurement of textured yarn parameters, a potential method for the direct optical measurement of textured filament yarn is presented here. Note de contenu : - Texturing principals, measurement capabilities and characteristics
- Innovative approach for optical measurement of texturing of filament yarnsEn ligne : https://drive.google.com/file/d/1ElqOpmb-YJfwIGDHLYswLrZPTskxsWHx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25845
in CHEMICAL FIBERS INTERNATIONAL > Vol. 66, N° 1 (03/2016) . - p. 37-39[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18021 - Périodique Bibliothèque principale Documentaires Disponible Multifunctional carbon nanofiber systems mass produced from water soluble polymers / Lee D. Cremar in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 1 (03/2016)
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Titre : Multifunctional carbon nanofiber systems mass produced from water soluble polymers Type de document : texte imprimé Auteurs : Lee D. Cremar, Auteur ; Javier Acosta-Martinez, Auteur ; Alexsandra Villarreal, Auteur ; Alfonso Salinas, Auteur ; Lin Wei, Auteur ; Yuanbing Mao, Auteur ; Karen Lozano, Auteur Année de publication : 2016 Article en page(s) : p. 40-42 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Conduction électrique
Fibres de carbone
Hydrophobie
Matériaux poreux
Nanofibres
Nontissés
Oléophilie
Solutions de polymère
Stabilité thermique
ThermogravimétrieRésumé : The high cost of polymer precursors, usage of organic solvents and/or energy consumption during carbonization post-processes has limited the use of carbon fiber systems for every day applications. Here, nonwoven nanofiber mats are developed utilizing the Forcespinning technology and subsequently exposed to acid vapor induced dehydration and low temperature carbonization (T < 800 °C) processes to produce multifunctional fine carbon fibers. This method allows for the production of highly porous nonwoven carbon cloths or yarns with micro- and mesoporosity. The fiber diameter can be tuned in the range of hundreds of nanometers to several microns. Thermophysical and microstructural characterization indicate graphitic formation due to carbonization that occurs during the chemical and heat treatment. The developed system shows high electrical conductivity, high surface area, thermal stability, hydrophobicity, and oleophilic behavior. En ligne : https://drive.google.com/file/d/1-MLQlexnUDaPandtoAvzA3bW7YI4Dxu2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25846
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Code-barres Cote Support Localisation Section Disponibilité 18021 - Périodique Bibliothèque principale Documentaires Disponible PE/carbon black compounds for fiber-based heating / Merle Bischoff in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 1 (03/2016)
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Titre : PE/carbon black compounds for fiber-based heating Type de document : texte imprimé Auteurs : Merle Bischoff, Auteur ; Benjamin Glauß, Auteur ; Adina Händel, Auteur ; Gunnar Seide, Auteur ; Thomas Gries, Auteur Année de publication : 2016 Article en page(s) : p. 43-44 Langues : Anglais (eng) Catégories : Analyse thermique
Conducteurs organiques
Fibres textiles synthétiques
Noir aramide
Polyéthylène
ThermocinétiqueIndex. décimale : 677.4 Textiles artificiels Résumé : The aim of the study is to investigate the conductivity and heat generation of a compound consisting of 90 wt%, polyethylene (PE) and 10 wto/o carbon black (CB). At this ratio the percolation barrier is exceeded. The produced filaments are highly conductive for polymers with a conductivity of 10 S/m to a = 50 S/m. Compared to pure polymer, which is rather an electric insulator (a = 10-5 S/m to a = 10-12 S/m ), this is a quite good property ; compared to iron or copper in the range of ? = 107 S/m further improvement is needed to have a fully conductive polymer. Indeed, this semiconductive property is the reason vvhy this compound is suitable of fiber-based heating. The electric tosses are used for heat generation. By varying the production process parameters, the influence of different variables is analyzed and the desired properties are optimized. So far, compound produced at the ITA had conductivities in the single-digit S/m area. The improvement by a factor of 10 is further described in the paper. Note de contenu : - Compound manufacture
- Determination of conductivity
- Thermal analysis
- Results
- Possible interpretation
- Comparison to other studiesEn ligne : https://drive.google.com/file/d/1RWK2ql8qX_BQ3_oC6dfTvVaCLQQTrhdg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25847
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Code-barres Cote Support Localisation Section Disponibilité 18021 - Périodique Bibliothèque principale Documentaires Disponible Lower conversion costs in spunbond production / André Wissenberg in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 1 (03/2016)
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Titre : Lower conversion costs in spunbond production Type de document : texte imprimé Auteurs : André Wissenberg, Auteur Année de publication : 2016 Article en page(s) : p. 45-46 Langues : Anglais (eng) Catégories : Coût -- Contrôle
Nontissés
PolymèresIndex. décimale : 677.4 Textiles artificiels Résumé : How do I manufacture nonwovens in a highly-efficient manner with low costs, using minimum raw materials but nevertheless in high quality ? At the IDEA, one of the world's largest nonwovens trade fairs, from May 3-5, 2016 in Boston, MA/USA, Oerlikon Neumag will present its comprehensive product portfolio for manufacturing nonwovens from PET, PP and other raw materials. The competencies here lie in the development and implementation of engineering solutions for the production of industrial nonwovens. En ligne : https://drive.google.com/file/d/1FKVHVKiqsDDbYdXO6OXF5Een8Y4e0snr/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25848
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Code-barres Cote Support Localisation Section Disponibilité 18021 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Unlocking nanofibers' potential Type de document : texte imprimé Année de publication : 2016 Article en page(s) : p. 32 Langues : Anglais (eng) Catégories : Electrofilature
Fibres de carbone
Nanofibres
Procédés de fabrication
ProductionIndex. décimale : 677.4 Textiles artificiels Résumé : Nanofibers — polymer filaments only a couple of hundred nanometers in diameter — have a huge range of potential applications, from solar tells to water filtration to fuel tells. But so far, their high cost of manufacture has relegated them to just a few niche industries. Researchers of the Massachusetts Institute of Technology (MIT), Boston, MA/USA, describe a new technique for producing nanofibers that increases the rate of production 4-fold while reducing energy consumption by more than 90%, holding out the prospect of cheap, efficient nanofiber production.
A systematic way was demonstrated in MIT's Microsystems Technology Laboratories to produce nanofi bers throug h electrospinning that surpasses the state-of-the-art, which opens a very interesting possibility. The group of researchers are working to push 3D printing further, to make it possible to print components that transduce, that actuate, that exchange energy between different domains, like solar to electrical or mechanical. They have something that naturally fits into that picture. They have an array of emitters that can be thought of as a dot-matrix printer, where it would be possible to individually control each emitter to print deposits of nanofibers.En ligne : https://drive.google.com/file/d/1AbmbBO314w8kvSYa6CswkHKkmcHX--v7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25852
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Code-barres Cote Support Localisation Section Disponibilité 18021 - Périodique Bibliothèque principale Documentaires Disponible
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