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A new way to a compromise / Marcus Poindl in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 1 (01/2013)
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Titre : A new way to a compromise Type de document : texte imprimé Auteurs : Marcus Poindl, Auteur ; Christian Bonten, Auteur Année de publication : 2013 Article en page(s) : p. 36-38 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrusion réactive
Polyamide 6
Polyéther bloc amide
Résistance au chocsIndex. décimale : 668.4 Plastiques, vinyles Résumé : Impact Modifier - Polyamides are widely used, but for some applications they are too brittle. A solution here consists of integrating a soft phase into the polyamide matrix. An innovative impact modifier was developed for polyamide 6 by reactive extrusion of a PA6/polyether block copolymer. In combination with PA6, it increases its impact strength while retaining a comparatively high stiffness. Note de contenu : - Reactive extrusion
- Structure and mechanisms
- Processing and propertiesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17217
in KUNSTSTOFFE INTERNATIONAL > Vol. 103, N° 1 (01/2013) . - p. 36-38[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14551 - Périodique Bibliothèque principale Documentaires Disponible Optimization and scale-up of twin-screw reactive extrusion : the case of EVA transesterification / Françoise Berzin in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 5 (11/2020)
[article]
Titre : Optimization and scale-up of twin-screw reactive extrusion : the case of EVA transesterification Type de document : texte imprimé Auteurs : Françoise Berzin, Auteur ; C. David, Auteur ; Bruno Vergnes, Auteur Année de publication : 2020 Article en page(s) : p. 422-428 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymère éthylène acétate de vinyle
Esterification
Extrudeuse bi-vis
Extrusion réactive
Modèles numériquesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Despite its complexity, reactive extrusion is continuously developing for the production of new and performing materials. Due to the strong coupling between flow, rheology and chemistry, optimizing this process for a given reaction remains a difficult task. Moreover, the scale-up from the laboratory to the production scale is another crucial question, which cannot be solved by conventional techniques. In this paper, we show how the use of numerical modeling may help answer these complex questions by providing realistic solutions, rapidly and without excessive costs. The example of a transesterification reaction was chosen because this reaction has been carefully characterized in previous studies. The reaction kinetics and the kinetic constants are well known and the modeling of this reactive extrusion process has proved to be realistic and accurate. Note de contenu : - CASE STUDY AND METHODOLOGY : EVA transesterification - Modeling
- OPTIMIZATION : Optimization of processing parameters - Optimization of screw profile
- SCALE-UPDOI : https://doi.org/10.3139/217.3958 En ligne : https://drive.google.com/file/d/1GwITc2fxsXwSC452KIaZof-rXRs03tPh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35064
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 5 (11/2020) . - p. 422-428[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22388 - Périodique Bibliothèque principale Documentaires Disponible Reactive compounding reduces sagging effects / Christian Bonten in KUNSTSTOFFE INTERNATIONAL, Vol. 101, N° 9 (09/2011)
[article]
Titre : Reactive compounding reduces sagging effects Type de document : texte imprimé Auteurs : Christian Bonten, Auteur ; Dan Zhang, Auteur Année de publication : 2011 Article en page(s) : p. 30-34 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Compoundage
Extrusion réactive
Matières plastiques -- Extrusion
Polyamide 66
Rhéologie
TubesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Thick-walled Semi-finished Products - With a new and cost-effective method, thick-walled pipe profiles can be made of low-viscous PA66 without “sagging” on conventional extrusion production lines. The viscosity of the low-viscous PA66 can be increased by reactive compounding. Note de contenu : - Reactive compouding step
- Chemical reactions
- Rheological characterization
- Mechanical characterization
- Extrusion of thick-walled pipe profilesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15022
in KUNSTSTOFFE INTERNATIONAL > Vol. 101, N° 9 (09/2011) . - p. 30-34[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13328 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Reactive extrusion of TPU : Production of thermoplastic polyurethanes with reduced carbon footprint Type de document : texte imprimé Auteurs : Aleksandra Buczko, Auteur ; Andrei Holzer, Auteur ; Simon Kemmerling, Auteur Année de publication : 2020 Article en page(s) : p. 43-45 Langues : Anglais (eng) Catégories : Extrusion réactive
Formaldéhyde
Formulation (Génie chimique)
Matières plastiques -- Extrusion
Polymères -- Synthèse
Polyols
Polyuréthanes
Thermoplastiques -- ExtrusionIndex. décimale : 668.4 Plastiques, vinyles Résumé : The simple replacement of petroleum-based components with renewable alternatives in a well-established reactive extrusion process is a promising route to more environmentally friendly thermoplastic polyurethane elastomers (TPU). However, this requires a comprehensive understanding of the interactions between chemical reactions and material flow within an extruder, as well as a thorough understanding of the effects of heat and shear on polymerization and melt processing. Note de contenu : - Advantages of reactive extrusion
- Novel polyol in classic TPU
- From the REX concept to the pilot process
- Use of sustainable polyols in the established REX process
- Figure : Extruded strand from the continuous synthesis of a thermoplastic polyurethand, containing the new paraformaldehyde-based polyol
- Fig. 1 : Thermoplastic polyurethand synthesized using the newly developed polyol based on paraformaldehyde core. The solvent cast foil has excellent transparency
- Fig. 2 : Development steps within "Dream Polyols" : from the preliminary determination of the polyurethane formulation and the REX conditions to the implementation of newly developed components in the established processing approach
- Fig. 3 : Determining the physical and chemical causes of the instabilities in reactive extrusion allows the dosing strategy and the processing wxindow to be adjusted, resulting in a well-controlled process
- Fig. 4 : Molecular weight and dispersity of thermoplastic polyurethane produced by the REX process. The polymer performance is controlled by a simple adjustment of the material formulationEn ligne : https://drive.google.com/file/d/1hqkeI-eieybWTmsT6QqYGCLpRAbvpo94/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34637
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 8 (2020) . - p. 43-45[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22305 - Périodique Bibliothèque principale Documentaires Disponible Relationships between crystallization behavior and application properties of chemically coupled PAI-PTFE coatings / Michaela Genan-Smolka in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)
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Titre : Relationships between crystallization behavior and application properties of chemically coupled PAI-PTFE coatings Type de document : texte imprimé Auteurs : Michaela Genan-Smolka, Auteur ; Dieter Jehnichen, Auteur ; Mikhail Malanin, Auteur ; Thomas Schmidt, Auteur ; Anne Marschner, Auteur ; Antje Schneider, Auteur ; Michael Göbel, Auteur Année de publication : 2024 Article en page(s) : p. 623-654 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Alliages polymères
Caractérisation
Extrusion réactive
Laque et laquage
Métaux -- Revêtements protecteurs
Polyamide-imide
Polymères -- Propriétés thermiques
Polytétrafluoréthylène
Revêtements organiques
Structure cristalline (solide)Index. décimale : 667.9 Revêtements et enduits Résumé : Poly(tetrafluoroethylene) (PTFE) is well known for its very low friction coefficient and thus widely used for antifriction applications, e.g., sliding lacquers, for many years. Because of the high wear rate and cold flow of the original polymer, PTFE is usually added in higher amounts to other polymer matrices as a lubricant. However, the incompatibility of PTFE requires lots of efforts to perform a homogeneous breaking down of agglomerates and particle distribution as well as dispersion stabilization of the physical mixtures during application and curing. PTFE can be functionalized by high energy irradiation and subsequently compatibilized with a polymer matrix by reactive extrusion resulting in chemical bonding of both polymers via suitable reactive groups. In this manner, poly(amide imide) (PAI) was coupled to γ-radiation modified PTFE micro-powder prior to the dispersion procedure. This study deals with the thermal and crystallization behavior of the PTFE lubricant in chemical bonded (cb) PAI-PTFEcb compound thin layers in comparison with those of the plain radiation modified PTFE depending on the cooling rate by DSC, Flash-DSC and WAXS. A morphological characterization of the extrudate as well as the coating gives information about the fragmentation and distribution of the PTFE phase in the PAI matrix. Furthermore, mechanical and surface properties of sliding lacquer films were analyzed after application on steel substrates by varying dry film thickness and curing. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials and material treatment - Characterization methods
- RESULTS AND DISCUSSION : Investigation of chemical bonding and PAI-PTFEcb morphology - Thermal behavior of the composite original polymer components - Thermal behavior of PAI-PTFEcb by defined slow cooling rates - Crystallization behavior by fast cooling -
X-ray measurements - Dispersion and film characterizationDOI : https://doi.org/10.1007/s11998-023-00845-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00845-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40782
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 2 (03/2024) . - p. 623-654[article]PermalinkYarns from chemically recycled textile waste and biopolymers modified through reactive extrusion in CHEMICAL FIBERS INTERNATIONAL, Vol. 70, N° 4 (12/2020)
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