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Polypyrrole-modified multi-functional coatings for improved electro-conductive, hydrophilic and flame-retardant properties of polyamide 66 textiles / Chanchal Kumar Kundu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)
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Titre : Polypyrrole-modified multi-functional coatings for improved electro-conductive, hydrophilic and flame-retardant properties of polyamide 66 textiles Type de document : texte imprimé Auteurs : Chanchal Kumar Kundu, Auteur ; Zhiwei Li, Auteur ; M. Azizur R. Khan, Auteur ; Oisik Das, Auteur Année de publication : 2023 Article en page(s) : p. 1223-1234 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Conduction électrique
Essais de comportement au feu
Essais dynamiques
Formulation (Génie chimique)
Hydrophilie
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Matériaux -- Propriétés fonctionnelles
Morphologie (matériaux)
Polyamide 66
Polypyrroles
Surfaces -- Analyse
Textiles et tissus à usages techniques -- Propriétés mécaniques
Thermogravimétrie
Traction (mécanique)Index. décimale : 667.9 Revêtements et enduits Résumé : Multi-functional textiles have received much attention in the technical textile field for their novel functionalities available in a single substrate. Polyamide 66 (PA66), being an engineering polymer with excellent physio-mechanical properties, exhibits immense possibilities to be developed as a multifunctional textile substrate. In this work, multi-functional polyamide 66 (PA66) textiles equipped with enhanced electro-conductive, hydrophilic and flame-retardant properties were developed via in situ polymerization of pyrrole monomer onto the PA66 fabric surfaces. Meanwhile, various formulations comprised of phytic acid (PA), chitosan (CS), graphene oxide (GO) and Na-metaborate (B) along with the pyrrole also experimented with a goal to study the contribution of each compound onto the desired properties and finally, to come up with a suitable formulation. Among these formulations, only pyrrole containing formulation (i.e., PA66-PPy) demonstrated a significant improvement in all three desired functionalities, namely a noteworthy escalation in electrical conductivity (i.e., about a 43 times increase compared to the pure PA66), a semi-hydrophilic surface (i.e., water contact angle value was lowered from 124.3– 49.9°) and a substantial reduction in the peak heat release rate by 45%. Meanwhile, the formulation comprising both the pyrrole and phytic acid made the polyamide surface a super-hydrophilic one, whereas other formulations exhibited potential efficacy in attaining better flame retardancy, especially in terms of limiting oxygen index (LOI) values, vertical flame test data and char yield%. Note de contenu : - EXPERIMENTAL :
- Materials
- Fabric preparation
- Characterization techniques
- RESULTS AND DISCUSSION :
- Surface morphology
- Electrical conductivity
- Hydrophilicity
- Thermal analysis
- Fire properties
- Mechanical properties
- Table 1 : Formulations and dry weight pickup of PA66 fabric samples
- Table 2 : Electrical conductivity data of PA66 fabric samples
- Table 3 : Thermogravimetric analysis data of PA66 fabric samples
- Table 4 : LOI and vertical flame test data of PA66 fabric samples
- Table 5 : Cone calorimetry data of PA66 fabric samples
- Table 6 : Tensile properties of PA66 fabric samplesDOI : https://doi.org/10.1007/s11998-023-00738-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00738-3.pdf?pdf=button Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39712
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 4 (07/2023) . - p. 1223-1234[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24153 - Périodique Bibliothèque principale Documentaires Disponible A polyurethane coating using CoMOF-BTA metal-organic framework for active protection of AA2024-T3 / Izuchukwu K. Nwokolo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)
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Titre : A polyurethane coating using CoMOF-BTA metal-organic framework for active protection of AA2024-T3 Type de document : texte imprimé Auteurs : Izuchukwu K. Nwokolo, Auteur ; Hongwei Shi, Auteur ; Alexander I. Ikeuba, Auteur ; Wanyu Zhang, Auteur ; Fuchun Liu, Auteur ; En-Hou Han, Auteur Année de publication : 2024 Article en page(s) : p. 521-535 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages
Anticorrosifs
Anticorrosion
Caractérisation
Electrochimie
Essais d'adhésion
Essais de brouillard salin
Polyuréthanes
Revêtements organiques
Test d'immersionIndex. décimale : 667.9 Revêtements et enduits Résumé : CoMOF-BTA, a new metal-organic framework with inherent corrosion inhibition ability was prepared via a one-step solvothermal process and characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and thermal analyses. Immersion and polarization tests were conducted to evaluate the ability of CoMOF-BTA to resist corrosion on AA2024-T3 alloy in NaCl solution. In addition, CoMOF-BTA particles were incorporated into polyurethane coatings to produce active anti-corrosion coatings, whose corrosion protection capabilities were assessed using electrochemical methods and salt spray analysis. The impedance results show that polyurethane coatings containing CoMOF-BTA have coating resistances (Rcoat) that are around two orders of magnitude higher than that without the CoMOF-BTA particles. The salt spray analysis also indicates the corrosion protection ability of coatings containing CoMOF-BTA particles after a long period of exposure. The results demonstrate that CoMOF-BTA improved the ability of AA2024-T3 to resist corrosion and confirm the anti-corrosion properties of CoMOF-BTA-laden coatings by the controlled release of BTA molecules in NaCl solution. This study offers a new anti-corrosion MOF material and active coating for the protection of aluminum alloys against corrosion. Note de contenu : - MATERIALS AND METHODS : Material - Synthesis of CoMOF-BTA - Characterization - Immersion tests on bare sample - Electrochemical tests - Adhesion test - Salt spray experiment
- RESULTS AND DISCUSSION : Characterization - Corrosion resistance of CoMOF-BTA on AA2024-T3 - Effects of CoMOF-BTA on polyurethane coating
- Table 1 : Chemical composition of Aluminum alloy 2024-T3 in wt.%
- Table 2 : Fitting results of polarization curves of the bare AA2024-T3 samples immersed in 3.5 wt.% NaCl and the extract solution of 2 wt. % CoMOF-BTA at 298 KDOI : https://doi.org/10.1007/s11998-023-00835-x En ligne : https://drive.google.com/file/d/1GL8tpOMjfMRArOUVCjXERSlwLlTivmve/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40774
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 2 (03/2024) . - p. 521-535[article]Polyurethane electrospun fiber biomimetics membrane for constructing the structure of grain layer with good breathability for cattle split leather / Nan Chen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 8 (08/2021)
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Titre : Polyurethane electrospun fiber biomimetics membrane for constructing the structure of grain layer with good breathability for cattle split leather Type de document : texte imprimé Auteurs : Nan Chen, Auteur ; Yanchun Li, Auteur ; Jianbo Qu, Auteur ; Jian-Yong Wang, Auteur Année de publication : 2021 Article en page(s) : p. 284-289 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Air
Caractérisation
Chimie biomimétique
Cuir
Electrofilature
Essais accélérés (technologie)
Membranes imper-respirantes
Mousses plastiques
Perméabilité
Polyuréthanes
Tissés
Vapeur d'eauIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The traditional thick coating on split leather does not have the ability to breathe like full grain leather. The air and water vapor permeabilities of full grain leather are well known properties due to its fiber woven structure. Simulating the fiber morphology and weaving structure of the dermis or grain layer is very important to construct a top surface layer for split leather. In this paper, a PU (polyurethane) foam layer is put first on the split to enhance the adhesion of a second application of a superfine fibrous PU resin. This foam uses well-known waterborne polyurethane foaming technology. This dried foam has good breathability because of high porosity. A superfine fiber membrane is next put atop of the foam layer by using an electro-spun polyurethane resin. This second resin imitates collagen fibers in the network structure of the leathers’ grain layer. Thus, this resultant electrospun fiber biomimetics membrane simulated the grain layer of natural leather. SEM showed the morphology and structure of this electrospun fiber biomimetic membrane to be like that of the grain layer of natural leather. The porosity and apparent density were basically the same as the grain of leather, which were 63.65% and 583.878 kg/m3 respectively. The air and water vapor permeability of the biomimetics membrane were also as high as 2250 mL·cm-2·h-1 and 8753.02 μg·cm-2·h-1 respectively. Therefore, the biomimetics membrane largely restored the ability to breathe of split leather. Thus, this method simulates the performance and structure of full grain leather and is a novel method for industrial production. Note de contenu : - EXPERIMENTAL : Materials and instruments - Preparation of the biomimetics electrospun fiber coating
- CHARACTERIZATION : Morphology observation - Porosity and apparent density analyses - Air permeability and water vapor permeability analyses
- RESULTS AND DISCUSSION : SEM observation of the surface and longitudinal of the sample - Test for air permeability and water vapor permeabilityDOI : https://doi.org/10.34314/jalca.v116i8.4358 En ligne : https://drive.google.com/file/d/1YepXdwsWoigjZKA57PKF4GCbf594UtuZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36085
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 8 (08/2021) . - p. 284-289[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22875 - Périodique Bibliothèque principale Documentaires Disponible Polyurethane prepolymers : an efficient dispersant core for sublimation inkjet inks / Ahmed S. Ahmed in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)
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Titre : Polyurethane prepolymers : an efficient dispersant core for sublimation inkjet inks Type de document : texte imprimé Auteurs : Ahmed S. Ahmed, Auteur ; Mohammed A. Mekewi, Auteur ; El-Said H. El-Mosallamy, Auteur ; Mahmoud A. Ibrahim, Auteur ; Ahmed K. Elziaty, Auteur Année de publication : 2022 Article en page(s) : p. 1871-1891 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents dispersants (chimie)
Caractérisation
Colorants dispersésCatégorie de colorants très peu solubles dans l'eau, utilisés à l'origine comme colorants pour l'acétate, et qui généralement sont appliqués sous forme de suspensions aqueuses de faible concentration.Les colorants dispersés sont largement utilisés dans la teinture de la plupart des fibres manufacturées, surtout le polyester.
Formulation (Génie chimique)
Impression jet d'encre
Impression sur étoffes
Polyuréthanes
PrépolymèresUn pré-polymère ou prépolymère est un oligomère ou un polymère présentant des groupes réactifs qui lui permettent de participer à une polymérisation ultérieure et d’incorporer ainsi plusieurs unités monomères dans au moins une chaîne de la macromolécule finale.
Les pré-polymères peuvent être di-fonctionnels (c'est le cas des pré-polymères téléchéliques) ou plurifonctionnels. Dans ce dernier cas, ils sont utilisés pour la fabrication de polymères thermodurcissables par réticulation.
Rhéologie
Tension superficielle
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, the modification of toluene diisocyanate “TDI”-based prepolymers was performed using three different polyols (trimethylol propane “TMP,” glycerol and castor oil). The prepared modified prepolymers were terminated using amino-polyether (Jeffamine M-2070) and maleic acid-modified polyethylene glycol “PEG 1000” to obtain dispersing agents for water-based disperse dye inkjet inks. Dispersants T1–T5 (based on TMP), dispersants G1–G5 (glycerol) and dispersants C1–C5 (castor oil) were characterized using FTIR to monitor the reaction progress. Inkjet inks made using these dispersants were characterized by particle size, dynamic surface tension, rheology profile and accelerated stability against commercial dispersant. The results revealed that glycerol and TMP-based dispersants provided optimum performance as compared to commercial standard, while castor oil-based dispersants failed the wettability and dispersion stability tests. Note de contenu : - EXPERIMENTAL : Materials - Instruments - Methods - Inkjet ink formulation
- RESULTS AND DISCUSSION : FTIR - Particle size - Mill base samples examination - Viscosity - Dynamic surface tension - Rheology - Foaming tendency - Printed fabric characterization
- Table 1 : Inkjet guide formula used to assess the prepared dispersants
- Table 2 : Relative reaction rate of different functional groups with isocyanate
- Table 3 : Particle size of the prepared inks before and after the accelerated stability test
- Table 4 : Guide formula for sublimation ink mill base
- Table 5 : Lists the particle size results for the mill base test samples
- Table 6 ; Mill base viscosity for inks prepared using dispersants of our study
- Table 7 : Color space values for the printed inksEn ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00658-2.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38504
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 6 (11/2022) . - p. 1871-1891[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23804 - Périodique Bibliothèque principale Documentaires Disponible Polyvinylidene fluoride/maghnite nanocomposites : fabrication and study of structural, thermal and mechanical properties / Zoulikha Khiati in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 5 (2023)
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Titre : Polyvinylidene fluoride/maghnite nanocomposites : fabrication and study of structural, thermal and mechanical properties Type de document : texte imprimé Auteurs : Zoulikha Khiati, Auteur ; Lahouari Mrah, Auteur Année de publication : 2023 Article en page(s) : p. 615-624 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique
Analyse thermique
Caractérisation
Matériaux hybrides
Matériaux hybrides -- Propriétés mécaniques
Polyfluorure de vinylidène
ViscositéIndex. décimale : 668.4 Plastiques, vinyles Résumé : An in-depth study of polyvinylidene fluoride (PVDF) based nanocomposite systems will be the focus of this research. This polymer being hydrophobic and apolar, it will be unlikely to generate strong interactions with clay leaves called organophilic maghnite. The challenge of this study will therefore be to manage the load/polymer interfaces by using montmorillonite with specific surface treatments by adding a surfactant Cetyltrimethylammonium bromide. Therefore, a significant improvement in mechanical and thermal properties was observed. The properties of PVDFNC nanocomposites were evaluated using various physico-chemical techniques (XRD, FTIR, TGA, DSC, TEM, SEM). The results of the structural and thermal measurements carried out on these products reveal that the structural concept of the surfactant influences both the morphological profile, the thermal and mechanical properties of the nanocomposites obtained. Accelerated crystallization is observed in PVDNC nanocomposites as an effective nucleation agent, the crystals formed are predominantly β shaped and have a small number of polar α crystals. Measurements by X-ray diffraction, as well as transmission and scanning electron microscopy indicated that modified maghnite was perfectly distributed 3 % by weight in the polyvinylidene fluoride matrix. The mechanical properties of the nanocomposites were evaluated according to the filler material used and the polyvinylidene fluoride matrix. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of PVDFN nanocomposites - Characterization
- RESULTS AND DISCUSSION : FTIR analysis - X-ray diffraction analysis - Transmission electron microscopy analysis - Scanning electron microscopy analysis - Optical microscopy - Thermogravimetric analysis - DSC - Index of fluidity (IF) - Dynamic mechanical thermal analysis (DMTA) - Mechanical properties
- Table 1 : The mechanical properties of the polymer PVDF and its nanocompositesDOI : https://doi.org/10.1515/ipp-2022-4302 En ligne : https://drive.google.com/file/d/1HzmeWpX0XDfyOG9B3TOQk7Aygdcr1R30/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40293
in INTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 5 (2023) . - p. 615-624[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24363 - Périodique Bibliothèque principale Documentaires Disponible Porous silicon-modified electrode for electrochemical pesticide biosensor / Maha Ayat in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
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PermalinkPoudres pour revêtement. Partie 10 : Détermination du rendement d'application - Norme ISO 8130-10 / International Organization for Standardization (Genève, Suisse) / Geneve [Switzerland] : International Organization for Standardization (ISO) (1998)
PermalinkPoudres pour revêtement. Partie 12 : Détermination pour la compatibilité - Norme ISO 8130-12 / International Organization for Standardization (Genève, Suisse) / Geneve [Switzerland] : International Organization for Standardization (ISO) (1998)
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PermalinkPremières cellules souches de Cannabis sativa : nourrir le microbiote / Oscar Expósito in EXPRESSION COSMETIQUE, N° Hors-série (12/2020)
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