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Rheological indicators for environmental stress cracking resistance of polyethylene / P. Sardashti in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 1 (03/2015)
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Titre : Rheological indicators for environmental stress cracking resistance of polyethylene Type de document : texte imprimé Auteurs : P. Sardashti, Auteur ; C. Tzoganakis, Auteur ; M. Zatloukal, Auteur ; M. A. Polak, Auteur ; A. Penlidis, Auteur Année de publication : 2015 Article en page(s) : p. 70-81 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Cisaillement (mécanique)
Contraintes (mécanique)
Essais dynamiques
Matières plastiques -- Fissuration
Polyéthylène basse densité linéaire
Polymères -- Détérioration
Rhéologie
Traction (mécanique)Index. décimale : 668.9 Polymères Résumé : Most studies on environmental stress cracking resistance (ESCR) of polymers have focused on performing mechanical tests in the solid state. In this work, investigations in the melt state were carried out, to identify potential melt indicators for a relative measure of ESCR. A normalized characteristic relaxation time (?N), obtained from dynamic shear experiments, was established as a valid measure of ESCR of linear low density polyethylene, where a large content of short chain branches is present. In addition, the melt strain hardening coefficient (MSHC), obtained from extensional rheological methodologies, was found to be another potential and reliable indicator of ESCR. An inverse correlation between MSHC and ESCR was observed, indicating an inverse relationship between ESCR and chain extensibility in the melt. Furthermore, a new factor called “melt hardening stiffness (mHS)” was developed from the slope of a stress vs. Hencky strain obtained from a Sentmanat extensional rheometer. mHS was found to be another promising indicator of ESCR obtained from rheological studies conducted in this work. Note de contenu : - EXPERIMENTAL : Materials - Molecular characterization - Tensile strain hardening (HS) test - Rheological characterization
- RESULTS AND DISCUSSION : Rheological characteristics under shear - Rheological characteristics under extensionDOI : 10.3139/217.2963 En ligne : https://drive.google.com/file/d/1cIjs2AX60nJx7DNBTIElUBe27-FBmf68/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23424
in INTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 1 (03/2015) . - p. 70-81[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17016 - Périodique Bibliothèque principale Documentaires Disponible Rheology of high-aspect-ratio nanocarbons dispersed in a low-viscosity fluid / Andrew Claypole in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)
[article]
Titre : Rheology of high-aspect-ratio nanocarbons dispersed in a low-viscosity fluid Type de document : texte imprimé Auteurs : Andrew Claypole, Auteur ; James Claypole, Auteur ; Alex Holder, Auteur ; Tim C. Claypole, Auteur ; Liam Kilduff, Auteur Année de publication : 2020 Article en page(s) : p. 1003-1012 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Encre -- Analyse
Encre d'imprimerie
Graphite
Matériaux -- Propriétés fonctionnelles
Nanoparticules
Nanotechnologie
Polyuréthanes
Rhéologie
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : Printing inks typically consist of a functional component dispersed within a low-viscosity resin/solvent system where interparticle interactions would be expected to play a significant role in dispersion, especially for the high-aspect-ratio nanocarbons such as the graphite nanoplatelets (GNPs). Rheology has been suggested as a method for assessing the dispersion of carbon nanomaterials in a fluid. The effects of phase volume of ammonia plasma-functionalized GNPs on a near-Newtonian low-viscosity thermoplastic polyurethane (TPU) resin system have been studied using shear and quiescent oscillatory rheology. At low concentrations, the GNPs were well dispersed with a similar shear profile and viscoelastic behavior to the unfilled TPU resin, as viscous behavior prevailed indicating the absence of any long-range order within the fluid. Particle interactions increased rapidly as the phase volume tended toward maximum packing fraction, producing rapid increases in the relative viscosity, increased low shear rate shear thinning, and the elastic response becoming increasingly frequency independent. The nanoscale dimensions and high-aspect-ratio GNPs occupied a large volume within the flow, while small interparticle distances caused rapid increases in the particle–particle interactions to form flocculates that pack less effectively. Established rheological models were fitted to the experimental data to model the effect of high-aspect-ratio nanocarbon on the viscosity of a low-viscosity system. Using the intrinsic viscosity and the maximum packing fraction as fitting parameters, the Krieger–Dougherty (K–D) model provided the best fit with values. There was good agreement between the estimates of aspect ratio from the SEM images and the predictions of the aspect ratio from the rheological models. The fitting of the K–D model to measured viscosities at various phase volumes could be an effective method in characterizing the shape and dispersion of high-aspect-ratio nanocarbons. Note de contenu : - METHOD : Materials - Ink synthesis - Rheometry - Analysis
- RESULTS AND DISCUSSION : Particle characterization - Rheological characterizationDOI : https://doi.org/10.1007/s11998-019-00319-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00319-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34387
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Code-barres Cote Support Localisation Section Disponibilité 21864 - Périodique Bibliothèque principale Documentaires Disponible Robust and flexible transparent protective film fabricated with an ambient-curable hybrid resin / Haitao Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
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Titre : Robust and flexible transparent protective film fabricated with an ambient-curable hybrid resin Type de document : texte imprimé Auteurs : Haitao Liu, Auteur ; Hailin Cao, Auteur ; Yudong Huang, Auteur ; Pengcong Shao, Auteur ; Yiwu Yan, Auteur Année de publication : 2021 Article en page(s) : p. 1065–1073 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Dureté (matériaux)
Polyéthylène téréphtalate
Polymères -- Synthèse
Polymères à terminaison silane
Polymérisation
Procédés de fabrication
Revêtements organiques
Souplesse (mécanique)
Transparence (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : An ambient-curable hybrid resin (ACHR) terminated with trimethoxysilane functional groups, synthesized through a simple ring-opening reaction between 3-glycidyloxypropyltrimethoxysilane (KH560) and 4,4′-methylenebis (cyclohexylamine) (PACM), was applied to the surface of a transparent organic polymer to produce a robust, flexible, and transparent protective hybrid film, moisture cured at room temperature. The structure, morphology, and optical, mechanical, and thermal properties of the obtained hybrid film were evaluated. The hybrid film allowed the transmittance of more than 87% of visible light (at 600 nm), maintaining almost the same high transparency as bare PET film. The unique flexible segments and rigid segments in the inorganic–organic hybrid structure of the film realized superior resistance to bending and scratching. The hybrid film-coated PET demonstrated excellent flexibility, with an extremely low bending radius, illustrated by wrapping around a 1-mm mandrel bar without cracking. In addition, the hybrid film exhibited superior pencil hardness (of 2H) and excellent wear durability, i.e., no scratching after being subjected to 200 abrasion cycles using #0000 steel wool under a 19.6 kPa load. The robust, flexible, and transparent protective film developed here, and its simple and efficient preparation method, should have extensive application prospects. Note de contenu : - Materials
- Synthesis of the silane-terminated ambient-curable hybrid resin (ACHR)
- Fabrication of the hybrid film
- Characterization
- Scheme 1 : (a) Synthesis scheme of the hybrid resin ; and (b) fabrication scheme of the hybrid filmDOI : https://doi.org/10.1007/s11998-021-00460-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00460-y.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36212
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Robust superamphiphobic aluminum surfaces : fabrication and investigation / Z. E. Zhao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
[article]
Titre : Robust superamphiphobic aluminum surfaces : fabrication and investigation Type de document : texte imprimé Auteurs : Z. E. Zhao, Auteur ; S. H. Sun, Auteur ; M. Hu, Auteur ; Y. Zhu, Auteur Année de publication : 2019 Article en page(s) : p. 1707-1714 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Amphiphobie
Caractérisation
Chimie des surfaces
Durée de vie (Ingénierie)
Fluoroalkylphosphonique, Acide
Métaux -- Surfaces
Morphologie (matériaux)
MouillabilitéIndex. décimale : 667.9 Revêtements et enduits Résumé : We report a facile, cost-effective, and environmentally friendly approach to fabricate superamphiphobic Al surfaces. Hierarchical micro/nanoscale morphology of Al surfaces was formed with CuCl2 etching followed by hot water treatment. After derivatization of fluoroalkylphosphonic acid (C10F21C2H4PO(OH)2, FPA) monolayer, desirable superamphiphobicity was achieved. It was found that the FPA/Al surfaces maintained superamphiphobic under the impinging by SiC flow with a falling height of 30 cm, suggesting good mechanical durability. Wettability measurement showed that the FPA self-assembled monolayer remained integrated up to 300°C, above which damage was observed. The approach reported in this paper can be readily integrated into product lines for wide variety of applications. Note de contenu : - EXPERIMENTAL : Materials and sample preparation - Surface characterization
- RESULTS AND DISCUSSION : Surface morphology - Surface wettability - Surface chemistry - Surface robustnessDOI : 10.1007/s11998-019-00143-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00143-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33424
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Code-barres Cote Support Localisation Section Disponibilité 21321 - Périodique Bibliothèque principale Documentaires Disponible Robust superhydrophilic antifogging coatings by a facile sol-gel method / Chong Ke in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)
[article]
Titre : Robust superhydrophilic antifogging coatings by a facile sol-gel method Type de document : texte imprimé Auteurs : Chong Ke, Auteur ; Chenhua Zhang, Auteur ; Zhang Huijun, Auteur ; Yongdong Jiang, Auteur Année de publication : 2023 Article en page(s) : p. 1343-1352 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Dioxyde de silicium
Hydrophilie
Nanoparticules
Revêtements anti-buée
Sol-gel, Procédé
Tétraéthoxysilane
Transparence (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, a simple one-step sol–gel process was applied to synthesize SiO2-based superhydrophilic antifogging coatings on glass substrates. In this process, Si(OH)4 sol was first prepared and then SiO2 nanoparticles were added to the sol to form coating solutions. The influence of both the Si(OH)4 sol and SiO2 nanoparticle contents on the coating properties was investigated. Their contents have significant effects on the coatings’ properties, including hydrophilicity and surface morphology. The water contact angle of the optimum coating is about 3.4°. Besides, as revealed by the steam test and freeze test, the optimum superhydrophilic coating demonstrates good antifogging properties and an adequate level of mechanical strength as well. Compared to other techniques used to fabricate antifogging coating on glass substrate, the sol–gel-based process developed in this study requires no expensive equipment, and the processing time is largely shortened. Thus, such technique has great potential applications in the field of coating industry. Note de contenu : - Materials
- Preparation of the superhydrophilic coatings
- CharacterizationDOI : https://doi.org/10.1007/s11998-022-00748-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00748-1.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39720
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