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Geometry-independent surface finishing / Livia Carmen Wiedau in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)
[article]
Titre : Geometry-independent surface finishing : Influence of chemical post-treatment on glass-filled polyamide 12 samples Type de document : texte imprimé Auteurs : Livia Carmen Wiedau, Auteur ; Anna Tarasova, Auteur ; Gerd Witt, Auteur Année de publication : 2021 Article en page(s) : p. 46-48 Langues : Anglais (eng) Catégories : Allongement à la rupture
Charges (matériaux)
Composites -- Propriétés mécaniques
Composites à fibres de verre
Frittage laser
Polyamide 12
Résistance à la traction
Rugosité
Traitement chimique
Verre
VitrificationIndex. décimale : 668.4 Plastiques, vinyles Résumé : In many technical applications, laser-sintered components still have inadequate surface topology. New methods of cost-effective and geometry-independent surface finishing of the laser-sintered specimens are therefore needed. Chemical post-treatment of laser-sintered PA12 components imparts enhanced mechanical characteristics as well as a reduction in roughness to ~85 %. Note de contenu : - Growing demand for post-treated additive manufacturing components
- Post-treatment methods
- Experimental setup
- Chemical post-treatment
- Surface roughness reduced
- Influence of process parameters and chemical post-treatment
- Fig. 1 : Elastic modulus and tensile strength of PA12
- Fig. 2 : Influence of post-treatment on glass-filled PA12
- Fig. 3 : Elastic modulus and tensile strength of glass-filled PA12
- Fig. 4 : Elongation at break of glass-filed PA12
- Table 1 : Process parameters for tensile specimens made of glass-filled and unfilled PA12En ligne : https://drive.google.com/file/d/13q7b0s0j42nY15AFCCp3a-dA711KyzII/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35743
in KUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 46-48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22682 - Périodique Bibliothèque principale Documentaires Disponible Growing more ductile epoxies : an essential work of fracture study / Frederik A. Pfaff in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 2 (06/2007)
[article]
Titre : Growing more ductile epoxies : an essential work of fracture study Type de document : texte imprimé Auteurs : Frederik A. Pfaff, Auteur Année de publication : 2007 Article en page(s) : p. 151-159 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calorimétrie
Epoxydes
Haut extrait sec
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Résistance chimique
Réticulants
Réticulation (polymérisation)
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements -- Propriétés thermiques:Peinture -- Propriétés thermiques
Rupture (mécanique)
Thermodurcissables
VitrificationIndex. décimale : 667.9 Revêtements et enduits Résumé : Ambient, amine-cured epoxy compositions exist within the dual constraints of VOC regulation and the vitrification effect, which limits the ultimate Tg of these materials. These combined constraints result in epoxy products that are densely crosslinked and which contain appreciable quantities of nonfugitive diluents or plasticizers. Such materials tend to be more brittle than traditional solvent-based epoxy coatings based on solid epoxy resin and polyamide hardeners. There is thus a need for a practical method to measure their fracture toughness. This work introduces the method of essential work as a useful way to determine the fracture toughness of thermoset systems. This method is then used to relate fracture toughness to the crosslink network structures of amine-cured epoxy compositions. The test compositions are varied systematically with a view to structure/properties interpretation, and employ an in situ chain extension approach to "grow" more ductile networks. Solvent uptake of selected compositions is also determined, and the relative trade-off between ductility vs. solvent uptake is examined. DOI : 10.1007/s11998-007-9013-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9013-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3656
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 4, N° 2 (06/2007) . - p. 151-159[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008269 - Périodique Bibliothèque principale Documentaires Disponible Thermal characterization of solvent-free epoxy coatings by rheology and kinetics combined / Weih Q. Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)
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Titre : Thermal characterization of solvent-free epoxy coatings by rheology and kinetics combined Type de document : texte imprimé Auteurs : Weih Q. Lee, Auteur Année de publication : 2020 Article en page(s) : p. 145-155 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique
Analyse thermique
Caractérisation
Epoxydes
Formulation (Génie chimique)
Gélification
Réticulation (polymérisation)
Revêtements organiques
Revêtements poudre:Peinture poudre
Rhéologie
Viscoélasticité
VitrificationIndex. décimale : 667.9 Revêtements et enduits Résumé : Rheology and kinetics are a pair of indispensable attributes in defining thermally reactive polymer coatings and paints. In this work, cure paths of volatile organic compound-free epoxy powder coatings, under heat, were characterized by viscoelastic and kinetic techniques. The essential rheological meanings of the gel point, the minimum complex viscosity, and the shear moduli from dynamic mechanical analysis curves were elucidated from applied formulation perspectives. Meanwhile, the maximum cure reaction rate and the peak temperature from differential scanning calorimetry exothermic profiles were quantitatively interpreted using primarily the extent of cure along with viscoelastic data. Vitrification and devitrification during cure were observed for high glass transition (Tg) epoxy formulations, unless a fast rate of heating was employed to a high enough temperature. Thorough and complete cure description provides strong insights for product development, allowing flow and cure properties to be balanced for optimal line performance. The consolidated approach is applicable to nearly all B-staged thermosetting systems of 100% solids including conditioned prepregs and a variety of adhesives per applications, as well as direct-to-metal primers or topcoats per functions. Note de contenu : - MATERIALS AND METHODS : DMA - DSC - Physicals
- RESULTS AND DISCUSSION : Generic Tg formulations - High Tg formulationsDOI : 10.1007/s11998-019-00248-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00248-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33734
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Code-barres Cote Support Localisation Section Disponibilité 21517 - Périodique Bibliothèque principale Documentaires Disponible