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Paste extrusion and mechanical properties of PTFE / M. Ansari in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 5 (11/2015)
[article]
Titre : Paste extrusion and mechanical properties of PTFE Type de document : texte imprimé Auteurs : M. Ansari, Auteur ; D. Vavlekas, Auteur ; J. L. McCoy, Auteur ; Savvas G. Hatzikiriakos, Auteur Année de publication : 2015 Article en page(s) : p. 603-614 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Densitométrie
Essais dynamiques
Extrusion capillaire
Matières plastiques -- Extrusion
Matières plastiques -- Propriétés mécaniques
Polytétrafluoréthylène
Traction (mécanique)Index. décimale : 668.9 Polymères Résumé : The paste extrusion process of two types of PTFE has been studied in capillary extrusion using dies having different reduction ratio (RR) and die entrance angles. The extrusion pressure shows a weak increase with shear rate over a wide range of flow rates and a more significant increase with reduction ratio. Moreover, the extrusion pressure exhibits a minimum for entrance angle at around 30°. A simple analytical model based on the radial flow hypothesis (previously developed) has been found to represent the extrusion pressure adequately as a function of flow rate (shear rate) and geometrical characteristics of the capillary dies. The extrudates collected at different processing conditions were dried and tested in uniaxial extension to assess their effect on mechanical properties. The tensile modulus, yield stress and ultimate tensile strength of the obtained extrudates were found to be increasing functions of reduction ratio, although the opposite effect was found for the ultimate elongational strain. These mechanical properties are also found to be insensitive to changes in the die entrance angle although the ultimate tensile strength has shown a maximum at the entrance angle of about 60°. The PTFE paste extrudates show a Poisson's ratio equal to zero in tensile experiments, thus exhibiting expansion (significant density reduction with stretching). Finally, a simple model was derived for the density change in tensile deformation by taking into the account the Poisson's ratio and the strain recovery (recovery of the elastic energy stored upon removal of the tensile stress). Note de contenu : - Extrusion process
- Tensile mechanical properties
- DensitometryDOI : 10.3139/217.3130 En ligne : https://drive.google.com/file/d/1uV9BM-co2L0iZ2GiLi0Nmp1wRHQjw2-1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24823
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Code-barres Cote Support Localisation Section Disponibilité 17557 - Périodique Bibliothèque principale Documentaires Disponible Perfluorinated micro-precision parts / Gabriele Hopf in KUNSTSTOFFE INTERNATIONAL, Vol. 106, N° 11 (11/2016)
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Titre : Perfluorinated micro-precision parts : Changing from turning to micro injection molding Rohde & Schwarz improve profitability Type de document : texte imprimé Auteurs : Gabriele Hopf, Auteur Année de publication : 2016 Article en page(s) : p. 32-34 Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par micro-injection
PolytétrafluoréthylèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : With the production of micro parts made of polytetrafluoroethylene by micro injection molding, Rohde & Schwarz play a pioneer role in the market. These high-frequency technology components, until recently still produced as turned parts, are now manufactured on machines from Wittmann Battenfeld specially designed for injection molding of small and micro parts. Note de contenu : - Are the released gases dangerous ?
- High-precision manufacturing processes
- FIGURES : 1. High-precision PTFE parts to be built into high-frequency components - 2. High-precision micro injection molding takes place in an air-conditioned room - 3. The mold for injection molding micro parts made of PTFE comprises 2x2 cavitiesEn ligne : https://drive.google.com/file/d/1xUOZF0LR9PZ4_poDcKApxGBn79ZQZC4r/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27511
in KUNSTSTOFFE INTERNATIONAL > Vol. 106, N° 11 (11/2016) . - p. 32-34[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18493 - Périodique Bibliothèque principale Documentaires Disponible Permanent protection against corrosion / Wolfgang Neumann in KUNSTSTOFFE INTERNATIONAL, Vol. 105, N° 8 (08/2015)
[article]
Titre : Permanent protection against corrosion : Lining of pipes, columns and vessels with polytetrafluoroethylene Type de document : texte imprimé Auteurs : Wolfgang Neumann, Auteur ; Fee Pitsch, Auteur ; Michael Schlipf, Auteur ; Robert Meyer zu Westram, Auteur Année de publication : 2015 Article en page(s) : p. 54-57 Langues : Anglais (eng) Catégories : Anticorrosion
Matières plastiques
Polymères hautes performances
Polytétrafluoréthylène
TubesIndex. décimale : 668.4 Plastiques, vinyles Résumé : For permanent protection against corrosion, the chemical industry relies on the property profile of fully-fluorinated fluoroplastics such as polytetrafluoroethylene (PTFE). These resist a wide range of aggressive media at process temperatures exceeding 100 °C. In combination with an economical processing technique like paste extrusion, pipelines, hoses and compensators as well as columns and vessels can be protected in this way against corrosion. Note de contenu : - Advantages at a glance
- Compact microstructure with high barrier effect
- Tight fit of loose liner
- Liners for special cases
En ligne : https://drive.google.com/file/d/1idXqslc-817BVV4yWrbdQkFVf59mksyJ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24570
in KUNSTSTOFFE INTERNATIONAL > Vol. 105, N° 8 (08/2015) . - p. 54-57[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17369 - Périodique Bibliothèque principale Documentaires Disponible Photoassisted degradation of CI reactive red 195 using and Fe(III)-grafted polytetrafluoroethylene fibre complex as a novel heterogeneous Fenton catalyst over a wide pH range / Bing Li in COLORATION TECHNOLOGY, Vol. 129, N° 6 (12/2013)
[article]
Titre : Photoassisted degradation of CI reactive red 195 using and Fe(III)-grafted polytetrafluoroethylene fibre complex as a novel heterogeneous Fenton catalyst over a wide pH range Type de document : texte imprimé Auteurs : Bing Li, Auteur ; Yongchun Dong, Auteur ; Ding Zhizhong, Auteur Année de publication : 2013 Article en page(s) : p. 403-411 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : acrylique, Acide L'acide acrylique ou acide acroléïque ou acide prop-2-énoïque est un composé organique de formule brute C3H4O2 et de formule semi-développée CH2=CHCOOH. C'est un acide carboxylique et un alcène vinylique, et se présente comme un liquide incolore à l'odeur âcre.
L'acide acrylique et ses esters, les acrylates, sont utilisés dans la fabrication de matières plastiques, dans les peintures acryliques et dans divers autres polyacryliques qui ont de multiples usages.
Catalyse hétérogène
Colorants azoïques
Colorants réactifs -- Détérioration
Colorants réactifs -- Effets du rayonnement ultraviolet
Copolymères greffés
Fenton, Réaction de
Fer trivalent
Greffage (chimie)
Ions cuivre
Oxydation
pH
Polytétrafluoréthylène
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Polytetrafluoroethylene fibre was grafted with acrylic acid to form an effective ligand, which coordinated with Fe(III) ions to prepare an Fe(III)-grafted polytetrafluoroethylene fibre complex. The photoassisted degradation of a typical azo dye, CI Reactive Red 195, using the Fe(III)-grafted polytetrafluoroethylene fibre complex as a novel heterogeneous Fenton catalyst in a wide pH range of 3–9 was investigated. In order to achieve better degradation in a higher pH range, the effect of Fe content, incorporation of Cu(II) ions and UV light irradiation on dye degradation was also examined. The results indicated that dye degradation was effective in the presence of the Fe(III)-grafted polytetrafluoroethylene fibre complex. Fast degradation of the dye can take place in an acidic environment. Increasing the Fe content or incorporating Cu(II) ions can significantly accelerate dye degradation, and UV light irradiation is much more effective than visible light irradiation in a higher pH range, especially in the alkaline pH range. Note de contenu : - EXPERIMENTAL : Materials and reagents - Graft polymerization of polytetrafluoroethylene fibres - Preparation of metal-grafted fibre complexes - Charaterisation of metal-grafted fibre complexes - Photocatalytic reaction set-up - Degradation procedure and analysis
- RESULTS AND DISCUSSION : Characterisation of metal-grafted fibre complexes - Metal ions leaching from the catalyst - Heterogeneous decomposition of dye at different solution pH - Fe content of the catalyst - Cu(II) ion as the assistant metal ion - UV light irradiationDOI : 10.1111/cote.12049 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12049/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19739
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Code-barres Cote Support Localisation Section Disponibilité 15730 - Périodique Bibliothèque principale Documentaires Disponible Polytetrafluoroethylene paste extrusion : a fibrillation model and its relation to mechanical properties / H. A. Ardakani in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)
[article]
Titre : Polytetrafluoroethylene paste extrusion : a fibrillation model and its relation to mechanical properties Type de document : texte imprimé Auteurs : H. A. Ardakani, Auteur ; Evan Mitsoulis, Auteur ; Savvas G. Hatzikiriakos, Auteur Année de publication : 2013 Article en page(s) : p. 306-313 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fibrillation
Matières plastiques -- Extrusion
Polymères -- Propriétés mécaniques
Polytétrafluoréthylène
Rhéomètres
Traction (mécanique)Index. décimale : 668.4 Plastiques, vinyles Résumé : The effects of process conditions on fibrillation and mechanical properties of polytetrafluoroethylene (PTFE) paste extrudates have been studied using capillary rheometers having barrels of different diameter and equipped with capillary dies of various designs. The tensile strength of PTFE extrudates is measured as a function of apparent shear rate (flow rate), reduction ratio (cross sectional area of barrel to that of die), contraction angle, and diameter of the barrel. To describe the effects of die design on the quality of the final product, a basic phenomenological mathematical model has been developed. The model consists of a simple equation that explains fibril formation, due to the compression of PTFE resins, plus a kinetic equation, which is coupled with the "radial-flow" hypothesis to predict the structure and the tensile strength of extrudates. The model predictions are found to be consistent with tensile strength measurements and SEM micrographs of the PTFE extrudates. Note de contenu : - EXPERIMENTAL : Materials - Methods
- Phenomenological model for fibrillation
- RESULTS AND DISCUSSION : Effect of apparent shear rate - Effect of contraction angle - Effect of reduction ratio - Effects of barrel sizeDOI : 10.3139/217.2744 En ligne : https://drive.google.com/file/d/16QKi1ff22J6kFEyW3RUQv4MlxNdfTBAC/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19020
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PermalinkSpectroscopic study of lactonic rhodamine B immobilised on polytetrafluoroethylene porous film / Shohei Yamaguchi in COLORATION TECHNOLOGY, Vol. 139, N° 4 (08/2023)
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