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Polymethylsilsesquioxane powder prepared by morphology-controlled growth and its composite with waterborne latex for superhydrophobic coating fabrication / Baiyu Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)
[article]
Titre : Polymethylsilsesquioxane powder prepared by morphology-controlled growth and its composite with waterborne latex for superhydrophobic coating fabrication Type de document : texte imprimé Auteurs : Baiyu Li, Auteur ; Chunxiao Zhang, Auteur ; Fei Jing, Auteur ; Xiang Li, Auteur ; Naipu He, Auteur ; Zaiman Liu, Auteur Année de publication : 2019 Article en page(s) : p. 1283-1294 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Hydrophobie
Latex
Polyméthylsilsesquioxane
Revêtements en phase aqueuse
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : The incompatibility of superhydrophobic particles with waterborne latexes impedes the direct mixing of them to make mixtures for superhydrophobic coatings fabrication. Polymethylsilsesquioxane (PMSQ) prepared by methyltrialkoxysilane precursors can change from hydrophilic to hydrophobic with the increased degree of condensation. This property makes PMSQ suitable for compounding with waterborne latexes for highly hydrophobic coatings fabrication. The present work presents a method for the morphology control of PMSQ to make highly porous PMSQ particles with micro-/nano-roughness on the surface. A gel of PMSQ was first prepared in aqueous medium and broken into small pieces by a high speed homogenizer; additional acid-catalyzed hydrolyzate of methyltrimethoxysilane was added to this dispersion of broken particles. The following base-catalyzed regrowth of PMSQ on the preformed gel skeleton gave highly porous PMSQ powder suitable for compounding with waterborne latexes. The composite of PMSQ wet powder and a styrene-acrylate waterborne latex gave a superhydrophobic coating after drying in ambient condition, of which the water contact angle reaches 153.1° and sliding angle is low to 28.7°. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PMSQ gel - Base-catalyzed regrowth in the environmnet of preformed gel small pieces - Preparation of composite coatings of PMSQ powder and waterborne latex - Characterization
- RESULTS AND DISCUSSION : Gel formation - Base-catalyzed regrowth of PMSQ in the preformed gel dispersion - Composite coatings of PMSQ wet powder and waterborne latexDOI : 10.1007/s11998-019-00204-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00204-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33011
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Code-barres Cote Support Localisation Section Disponibilité 21154 - Périodique Bibliothèque principale Documentaires Disponible Polypyrrole-coated latex particles as core/shell composites for antistatic coatings and energy storage applications / S. M. M. Morsi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)
[article]
Titre : Polypyrrole-coated latex particles as core/shell composites for antistatic coatings and energy storage applications Type de document : texte imprimé Auteurs : S. M. M. Morsi, Auteur ; M. E. Abd El-Asis, Auteur ; R. M. M. Morsi, Auteur ; A. I. Hussain, Auteur Année de publication : 2019 Article en page(s) : p. 745-759 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antistatiques
Copolymères
Core-Shell
Energie -- Stockage
Latex
Polymérisation en émulsion
Polypyrroles
Revêtements -- Analyse
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Antistatic coatings based on latexes of core/shell composites were prepared from poly(styrene-co-butyl acrylate-co-acrylamide-co-acrylic acid) (PSBAA) core and polypyrrole (PPy) shell. PSBAA was prepared by semicontinuous seeded emulsion polymerization in a typical process to that implemented in the industrial scale. The copolymer-emulsified particles were surface-modified by in situ polymerization of 2 and 10 wt% pyrrole to PSBAA solid to yield PSBAA/2PPy and PSBAA/10PPy composites, respectively. The purpose of this modification is to enhance the electrical properties of PSBAA particles, thus preventing the buildup of static electricity on their coatings. The composites were characterized by FTIR, DSC, TGA, XRD, DLS, TEM, SEM, and EDX. The mechanical, antistatic, and dielectric properties of the coatings were determined. The volume resistivity of PSBAA/2PPy and PSBAA/10PPy composites was 2.60 × 109 and 1.2 × 107 Ω.cm, respectively, that is, proper to act as antistatic coatings. AC conductivity (σac) measurements showed that the modification of PSBAA transferred it from insulator material with σac 1.83 × 10−10 S/cm to semiconducting material PSBAA/10PPy with σac 8.33 × 10−8. The increase in dielectric constant from 0.73 in PSBAA to 149.90 in PSBAA/10PPy indicates that the prepared composites represent promising candidates to be used as energy storage materials in electronic devices. Note de contenu : - EXPERIMENTAL : Materials - Methodology - Characterization techniques
- RESULTS AND DISCUSSION : FTIR analysis - TGA analysis - DSC analysis - XRD analysis - TEM images - SEM photographs - EdX analysis - AFM analysis - DLS analysis - Electrical propertiesDOI : 10.1007/s11998-018-00152-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00152-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32587
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Code-barres Cote Support Localisation Section Disponibilité 20953 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Polysilazanes : Binders that make a difference to surfaces Type de document : texte imprimé Auteurs : Yang Wang, Auteur ; Ralf Grottenmuller, Auteur ; Theresa Lorenz, Auteur Année de publication : 2019 Article en page(s) : p. 38-45 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Essais accélérés (technologie)
Liants
Polysilazanes
Résistance au rayonnement ultraviolet
Résistance aux conditions climatiques
Revêtements -- Additifs:Peinture -- Additifs
Revêtements anti-graffitis
Revêtements organiques
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Polysilazanes are pre-ceramic polymers with a silicon-nitrogen backbone. In recent years they have developed as a high-performance binder in protective coatings for transportation vehicles, commercial and residential buildings, and industrial plants. This article reviews their structure-property relationship and highlights their performance in high-temperature, surface hardness, weathering and corrosion protection, and anti-graffiti applications. Note de contenu : - Synthesis and process
- Heat stability
- Surface Hardness
- Weather and corrosion resistance
- Anti-graffiti properties
- Coating uniformity
- Fig. 1 : Polymer structures for PHPS and OPSZ, where R is H, CH3, CH=CH2, other alkyl, or aryl groups
- Fig. 2 : Polymer structures for PHPS and OPSZ, where R is H, CH3, CH=CH2, other alkyl, or aryl groups
- Fig. 3 : The two curing routes for OPSZ, where R1 and R2 are H, CH3, CH=CH2, other alkyl or aryl groups
- Fig. 4 : Thermal stability evaluation of polysilazanes. Panel A shows the results of TGA for polysilazanes and two commercial silicone resins. All materials were dried at 120°C for four hours before TGA to simulate the thermal stability of their coatings. Panel B shows a stainless-steel exhaust pipe coated with both PHPS and OPSZ-based TBC. Panel C compares the visual appearance of a coated and uncoated exhaust pipe after pyrolysis at 1000°C for one hour in air. Panels B and C were obtained from the Royal Society of Chemistry and Motz et al. at the University of Bayreuth with permission
- Fig. 5 : Characteristics of surface hardness for PHPS and OPSZ coatings. Panel A displays data of surface hardness for PHPS coatings on silicon substrates cured at different temperatures. These coatings have a film thickness of 1–1.2 μm. The hardness was measured via pencil hardness (in blue bars), Martens hardness (orange dots), and indentation resistance (black dots). The dots lines are guides for the eyes. Panel B shows a reference scale of pencil hardness, Martens hardness, and indentation resistance by using a bare glass and PMMA substrate. Panel C shows the anti-scratching property for a ∼3 μm thick OPSZ coating in clearcoat applications, and Panel D shows a similar performance for pigmented coatings. Both pigmented coatings have 17 wt% of pigment loading, a film thickness of 10–12 μm, and the right panel has 40 wt% polysilazane as a binder. Crockmeter test was performed by using an Atlas AATCC Crockmeter with 3M Wet-or-Dry 281Q rubbing cloth
- Fig. 6 : Panel A shows two steel substrates after a 10-day water condensation test at a constant humidity of 50%. They have an electrochemically deposited white basecoat with a film thickness of 15–20 μm that partially covers the substrates. The substrate on the left has a 3–4 μm thick polysilazane-based clearcoat, while the one on the right does not. Panel B shows a similar comparison of coated and uncoated areas on a steel substrate after three days of HCl vapor exposure at room temperature [a beaker of HCl solution (37 vol%) was placed in the test chamber]. The coating thickness is about 2 μm
- Fig. 7 : Panel A is a comparison of contact angle and surface energy for polysilazanes and three common binder materials, including nitrocellulose lacquer, acrylates, and polyurethanes. Also shown in Panel A is the value of the polar and dispersive component of surface energy, and surface energy is a sum of the polar and dispersive component. Panel B shows water drop shapes and contact angle measurements on a neat polysilazane coating and on a formulated polysilazane coating with other surface additives
- Fig. 8 : Panel A is a marker test to demonstrate the ink repellency and easy-to-clean properties for a polysilazane based clearcoat. The inset shows the results after cleaning with a dry towel. Panel B is the result of an anti-graffiti test performed on a similar coating according to ASTM D6578, where level 1—dry cloth, level 2—mild detergent solution, level 3— limonene-based cleaner, level 4—isopropanol, and level 5—methyl ethyl ketone, n.c.—not cleanable
- Fig. 9 : Three-dimensional surface morphology scans for a bare steel substrate (A), an OPSZ-based clearcoat on a steel panel (B), and a similar coating on a glass substrate (C). The polysilazane coating thickness is about 15 μm and 10 μm on the steel and the glass substrate, respectively
- Table 1 : DIN/EN/ISO tests that OPSZ-based coatingsz have successfully passed
- Table 2 : OPSZ coating performance before and after artificial weathering and UV stability testEn ligne : https://drive.google.com/file/d/1KuEizt3Csd6O2NpcxCtM9uj10C1GeiwC/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32737
in COATINGS TECH > Vol. 16, N° 6 (06/2019) . - p. 38-45[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21023 - Périodique Bibliothèque principale Documentaires Disponible Polythioether advances provide new formulating / Christian Probst in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 27, N° 1 (01/2020)
[article]
Titre : Polythioether advances provide new formulating Type de document : texte imprimé Auteurs : Christian Probst, Auteur Année de publication : 2020 Article en page(s) : p. 12-15 Langues : Américain (ame) Catégories : Allongement à la rupture
Colles:Adhésifs
Durée de vie en pot
Epoxydes
Mastics
Polyacryliques
Polymères -- Propriétés mécaniques
Polythioéther
Résistance à la traction
Résistance au rayonnement ultraviolet
Résistance chimique
Revêtements organiquesIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : colorless, toughening, and chemically resistive polythioether has been developed for the formulation of adhesives, sealants, and coatings. Note de contenu : - Reactivity
- Flexibility
- Chemical resistivity
- UV stability
- Applications
- Epoxy-terminated
- Fig. 1 : Chemical structure of the new polythioether
- Fig. 2 : Adjustment of pot life by variation of catalyst structure and amount
- Fig. 3 : Elongation at break and tensile strength of the polythioether compared to commercial toughening polyetheramines
- Fig. 4 : Schematic representation of the experimental setup. Test specimens before and after 21 days of exposure to different solvents
- Fig. 5 : Schematic representation of the experimental setum. Test specimen before and after 14 adys of exposure to UV lightEn ligne : https://www.adhesivesmag.com/articles/97449-polythioether-advances-provide-new-f [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33384
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Code-barres Cote Support Localisation Section Disponibilité 21463 - 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)
[article]
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 dispersion technology for direct to metal coatings / Mrunal Vaidya in PAINTINDIA, Vol. LXXI, N° 8 (08/2021)
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