New liquid crystal polyester filament yarns / Kota Nakamura in CHEMICAL FIBERS INTERNATIONAL, Vol. 68, N° 4 (12/2018)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > Vol. 68, N° 4 (12/2018) . - p. 174-175 Titre : New liquid crystal polyester filament yarns Type de document : texte imprimé Auteurs : Kota Nakamura, Auteur ; Ryosuke Sakae, Auteur ; Hisatoshi Tanaka, Auteur ; Munekazu Matoba, Auteur Année de publication : 2018 Article en page(s) : p. 174-175 Langues : Anglais (eng) Catégories : Essais de résilience Fibres textiles -- Propriétés physiques Fibres textiles synthétiques Flexion (mécanique) Fluage Morphologie (matériaux) Polyarylates Les polyarylates (PAR) sont une famille de polymères thermoplastiques techniques à propriétés thermomécaniques élevées. Ils comportent un enchaînement de cycles aromatiques très stables liés par des liaisons ester (CO-O). Ce sont donc des polyesters aromatiques. Polyesters polymères cristaux liquides Index. décimale : 677.4 Textiles artificiels Résumé : Since the development of aramid fibers by DuPont, several companies have conducted research into the possibility of meltspinnable polyarylate fibers. In the present day, Liquid Crystal Polyester (LCP) fibers, which are made from a polymer consisting of 6-hydroxy-2-naphthoic acid and hydroxybenzoic acid using Celanese technology, have been placed on the market by Kuraray. LCP fibers are a kind of super-fibers, and can be obtained by melt-spinning and then shifting to heat treatment for solid state polymerization in the form of fibers, which gives superior performance to fibers such as higher level of tenacity, modulus, wet strength, etc. The reason why only a limited number of manufacturers could produce them is in the difficulty of its spinning and heat treating processes, though LCP filament yarns have interesting characteristics. However, Toray Industries has succeeded in the development of new LCP filament yarns named Siveras which are based on polymer different from existing LCP fibers. Toray is able to produce both LCP polymer and fibers. Siveras is developed by the combination of polymer technology and original spinning processes which contributed in creating unique characteristics. Note de contenu : - Fig. 1 : Physical properties of Siveras - Fig. 2 : Creep property of Siveras - Fig. 3 : Strength retention ratio of several super fibers after twisting at twist factor 80 - Fig. 4 : Morphology of super fibers after at twist factor 80 - Fig. 5 : Strenght and strenght ratio of various super fibers in rope product - Fig. 6 : Strenght and strenght ratio after bending repeatedly under 0.88 cN/dtex load En ligne : https://drive.google.com/file/d/1xPb7RCUQaJm46s2BqPHDO8xRgUZZSn-J/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31351 [article]

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New liquid crystal polyester filament yarns / Kota Nakamura in CHEMICAL FIBERS INTERNATIONAL, (10/2019)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > (10/2019) . - p. 38-39 Titre : New liquid crystal polyester filament yarns Type de document : texte imprimé Auteurs : Kota Nakamura, Auteur ; Ryosuke Sakae, Auteur ; Hisatoshi Tanaka, Auteur ; Munekazu Matoba, Auteur Année de publication : 2019 Article en page(s) : p. 38-39 Langues : Anglais (eng) Catégories : Cristaux liquides Extrusion filage Fibres textiles -- Propriétés mécaniques Fibres textiles -- Propriétés physiques Filaments Fibre 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. Fluage Morphologie (matériaux) Polyesters Torsion (mécanique) Index. décimale : 677.4 Textiles artificiels Résumé : Since the development of aramid fibers by DuPont, several companies have conducted research into the possibility of melt-spinnable polyarylate fibers. In the present day, Liquid Crystal Polyester (LCP) fibers, which are made from a polymer consisting of 6-hydroxy-2-naphthoic acid and hydroxy-benzoic acid using Celanese technology, have been placed on the market by Kuraray. LCP fibers are a kind of super-fibers, and can be obtained by melt-spinning and then shifting to heat treatment for solid state polymerization in the form of fibers, which gives superior performance to fi bers such as higher level of tenacity, modulus, wet strength, etc. The reason why only a limited number of manufacturers could produce them is in the difficulty of its spinning and heat treating processes, though LCP filament yarns have interesting characteristics. However, Toray Industries has succeeded in the development of new LCP filament yarns named Siveras which are based on polymer different from existing LCP fibers. Toray is able to produce both LCP polymer and fibers. Siveras is developed by the combination of polymer technology and original spinning processes which contributed in creating unique characteristics. Note de contenu : - Fig. 1 : Physical properties of Siveras - Fig. 2 : Creep property of Siveras - Fig. 3 : Strength retention ratio of several super fibers after twisting at twist factor 80 - Fig. 4 : Morphology of super fibers after twisting at twist factor 80 - Fig. 5 : Strength and strength retention ratio of various super fibers in rope product - Fig. 6 : Strength retention ratio after bending repeatedly under 0.88 cN/dtex load En ligne : https://drive.google.com/file/d/1sbNszAtkQZj3dZNdlSg4TKM1u1ZamYPc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33081 [article]

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