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Effect of an amphoteric chromium-free polymer retanning agent with reactive aldehyde groups on collagen fibers / Wang Xuechuan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 10 (10/2019)
[article]
Titre : Effect of an amphoteric chromium-free polymer retanning agent with reactive aldehyde groups on collagen fibers Type de document : texte imprimé Auteurs : Wang Xuechuan, Auteur ; Hao Dongyan, Auteur ; Xiaoye Chai, Auteur ; Li Ji, Auteur Année de publication : 2019 Article en page(s) : p. 373-381 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Agents de tannage
AldéhydesUn aldéhyde est un composé organique, faisant partie de la famille des composés carbonylés, dont l'un des atomes de carbone primaire (relié au plus à 1 atome de carbone) de la chaîne carbonée porte un groupement carbonyle.
L'aldéhyde le plus simple est le formaldéhyde (ou méthanal), aussi appelé formol lorsqu'il est en solution aqueuse.
Un aldéhyde dérive formellement d'un alcool primaire (oxydation) dont le groupement hydroxyde -OH est en bout de chaîne et se forme suite à l'enlèvement de deux atomes H d'où le nom "alcool déshydrogéné" ou aldéhyde.
Caractérisation
Chimie analytique
Colorants acides
Composés amphotériques
Composés organiques -- Synthèse
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuirs et peaux -- Teinture
Cuirs et peaux de moutons
Douceur (toucher)
Essais de résilience
Essais dynamiques
Frottements (mécanique)
Huiles et graisses -- Absorption
Liaisons chimiques
Polymères
Retannage
Tannage végétal
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A chromium-free amphoteric polymer retanning agent was prepared by free radical polymerization reaction of undecylenic aldehyde (UAL), acrylic acid (AA) and dimethyl diallyl ammonium chloride (DADMAC) as raw materials. The structure of amphoteric polymer retanning agent was characterized by FT-IR and 1H-NMR. Amphoteric polymer retanning agent was applied to the retanning of vegetable-tanned light leather to investigate the binding ability of crust leather to anionic dyes, fat liquoring agent and physical-mechanical properties of the crust leather. The results showed that the synthesized amphoteric polymer retanning agent was successfully prepared. The application trial indicated that the amphoteric polymer retanning agent can improve the binding capacity between leather and anion dye and fat liquoring agent in the retanning process. The dye absorption rate of the crust leather was up to 99.58% and the dyeing liquor was clear. Furthermore, color of the crust leather was uniform and full and its K/S value and drywet rub fastness, thickening rate and physical-mechanical properties were higher than that of the retanned leather by acrylic resin retanning agent. In addition, the crust leather after retanning with amphoteric polymer retanning agent has good softness, and the absorption rate of fat liquoring agent was 99.62%. The above results showed that amphoteric polymer retanning agent possessed the good retanning property in vegetable tanned sheep garment leather. Note de contenu : - EXPERIMENTAL : Materials - Instruments - Synthesis of amphoteric polymer retanning agent (PADU) - Fourier Transform Infrared Spectroscopy (FT-IR) - Nuclear Magnetic Resonance Hydgogen Spectra (H-NMR) - Test of shrinkage temperature - Test of uptake of dye - Test of color strength (K/S) value - Test of dry and wet rub fastness - Test of absorption of fat liquoring agent - Test of softness - Test of thickening percentage - Test of tensile strength and tearing strength - SEM observation
- RESULTS AND DISCUSSION : FT-IR analysis - H-NMR analysis - Shrinkage - Contrast of bath before and after dyeing - Comparison of pictures of crust leathers retanned by different retanning agent - Dyeing properties of the crust leathers - Comparison of uptakes of fat liquoring agent in different crust leathers - Physical properties of crust leather - SEM observationEn ligne : https://drive.google.com/file/d/1ZhR1F8pIPUy_fgU3qYJV6V4qs6tezhHl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33033
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 10 (10/2019) . - p. 373-381[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21208 - Périodique Bibliothèque principale Documentaires Disponible Effect of hydrophilic chain extenders on properties of hyperbranched waterborne polyurethane / Wang Xuechuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 2 (03-04/2016)
[article]
Titre : Effect of hydrophilic chain extenders on properties of hyperbranched waterborne polyurethane Type de document : texte imprimé Auteurs : Wang Xuechuan, Auteur ; Ren Jing, Auteur ; Qiang Taotao, Auteur Année de publication : 2016 Article en page(s) : p. 62-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés organiques -- Synthèse
Cuirs et peaux -- Finition
Diméthyl butanoïque, Acide
Essais de résilience
Essais dynamiques
Mouillabilité
Polymères -- Analyse
Polymères -- Propriétés mécaniques
Polymères en émulsion
Polymères ramifiés
Polyuréthanes
Propionique diméthylol, Acide
Résistance chimique
Résistance thermiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Using hydroxyl terminated hyperbranched polymer as the core, dimethylol propionic acid (DMPA), dimethylolbutanoic acid (DMBA), carboxylic acid type monomer (DMCA) as the hydrophilic chain extenders respectively, three different types of hyperbranched waterborne polyurethane leather finishing agents were synthesized. The structures and properties of the products were characterized by FT-IR, SEM, AFM and TG. Simultaneously, the mechanical properties, surface wettability and water and solvent resistance of three films were studied. The results found the order of crystallinity to be : DMBA-HWPU Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Sources - The synthesis of DMCA - The synthesis of hyperbranched waterborne polyurethane
- RESULTS AND DISCUSSION : Fourier transforms infrared spectroscopy - X-ray diffraction - Scanning electron microscopy (SEM) - Atomic force microscope (AFM) - Emulsion particle size - Simultaneous thermal analysis curves - Physical and mechanical propertiesEn ligne : https://drive.google.com/file/d/1GQlPV_HUIq7F-tUUWLvt_sE5TcVb2FzQ/view?usp=drive [...] Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26088
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 2 (03-04/2016) . - p. 62-66[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17955 - Périodique Bibliothèque principale Documentaires Disponible Effect of operating parameters on the structural growth of ZnAl layered double hydroxide on AA6082 and corresponding corrosion resistance properties / Muhammad Ahsan Iqbal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)
[article]
Titre : Effect of operating parameters on the structural growth of ZnAl layered double hydroxide on AA6082 and corresponding corrosion resistance properties Type de document : texte imprimé Auteurs : Muhammad Ahsan Iqbal, Auteur ; Michele Fedel, Auteur Année de publication : 2019 Article en page(s) : p. 1423-1433 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages
Anticorrosifs
Anticorrosion
Composés organiques -- Synthèse
Hydroxydes doubles lamellaires
Morphologie (matériaux)
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, a series of ZnAl layered double hydroxide (ZnAl-LDH) thin films were synthesized on an AA6082 alloy by a single-step hydrothermal process at different synthesis parameters, including reaction temperature, reaction time, pH, and the relation between the LDH structural variations, and the corresponding corrosion resistance properties are briefly reported. The as-prepared synthetic coatings were characterized by scanning electron microscopy and X-ray diffraction. The corresponding corrosion properties were evaluated through potentiodynamic polarization curves and through electrochemical impedance spectra. The findings demonstrated that synthesis parameter variations impart an influential effect on the geometry of LDH, film thickness, and structural morphologies which have a significant impact on LDH corrosion resistance properties. The ZnAl-LDH corrosion resistance was found to increase with respect to extended high temperature and aging time, while the synthetic pH conditions also promoted LDH growth and film thickness, relative to lower-pH reaction conditions. The optimization results are attributed to high ZnAl-LDH corrosion resistance and act as a strong barrier film and ion-exchange surface area. The ZnAl-LDH films at 80°C-18r-6.5pH have shown much lower corrosion current density compared to bare AA6082, and a decrease of up to five orders of magnitude is observed. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of ZnAl layered double hydroxide film
- CHARACTERIZATIONEn ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00227-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33022
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Code-barres Cote Support Localisation Section Disponibilité 21154 - Périodique Bibliothèque principale Documentaires Disponible Effect of pendant functional groups on curing kinetics and final properties of cardanol-based benzoxazines / Kunal Wazarkar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)
[article]
Titre : Effect of pendant functional groups on curing kinetics and final properties of cardanol-based benzoxazines Type de document : texte imprimé Auteurs : Kunal Wazarkar, Auteur ; Anagha Sabnis, Auteur Année de publication : 2018 Article en page(s) : p. 555-569 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Analyse thermique
Benzoxazine
Cardanol
Cinétique chimique
Composés organiques -- Synthèse
Polymérisation
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : The present study reveals the effect of pendant functional groups on curing and final properties of cardanol-derived benzoxazines. Three benzoxazines are synthesized by choosing three functional amines, namely aniline, 4-aminophenol, and 4-aminobenzoic acid. The structure of the benzoxazines is confirmed by chemical as well as spectroscopic analysis. Curing kinetics of benzoxazines is studied using nonisothermal differential scanning calorimetry (DSC) at four different heating rates: 5, 10, 15, and 20 degrees per minute. Further, kinetic models of Kissinger and Flynn–Wall–Ozawa are applied to determine the kinetic parameters of the curing reaction. Curing kinetics and modeling studies reveal that benzoxazine containing phenolic OH requires lower energy of activation for curing as compared to carboxyl functional benzoxazine and neat benzoxazine. Moreover, coatings are applied on mild steel (MS) panels and evaluated for mechanical, chemical, and thermal properties. Note de contenu : - MATERIALS
- EXPERIMENTAL : Synthesis of benzoxazines - Panel preparation - Coating application
- INSTRUMENTATION
- CHARACTERIZATION
- RESULTS AND DISCUSSIONS : FTIR spectroscopy - H-NMR spectroscopy - Gel permeation chromatography - Curing kinetics by nonisothermal DSC analysis - Mechanism of curing - Coating propertiesDOI : 10.1007/s11998-017-0020-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0020-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30752
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Code-barres Cote Support Localisation Section Disponibilité 20024 - Périodique Bibliothèque principale Documentaires Disponible Effect of three structurally different epoxy resins on fire resistance, optical transparency, and physicomechanical properties of intumescent fire-retardant transparent coatings / Raj Shree in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)
[article]
Titre : Effect of three structurally different epoxy resins on fire resistance, optical transparency, and physicomechanical properties of intumescent fire-retardant transparent coatings Type de document : texte imprimé Auteurs : Raj Shree, Auteur ; R. Baloji Naik, Auteur ; Rupesh S. Naik, Auteur ; G. Gunasekaran, Auteur Année de publication : 2021 Article en page(s) : p. 535–547 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Charbon, Cendres de
Composés organiques -- Synthèse
Epoxydes
Essais de comportement au feu
Fourier, Spectroscopie infrarouge à transformée de
Gommes et résines
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Intumescence (chimie)
Phosphates
Polyphosphorique, Acide
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés physiques
Revêtements organiques
Transparence (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : Transparent intumescent fire-retardant (IFR) coatings are the newest passive fireproofing materials which maintain structural integrity without losing aesthetic appearance of the substrate. In this present paper, effects of three IFR coatings with structurally different epoxy resins, namely aliphatic, cycloaliphatic, and aromatic, on the fire resistance, transparency, and physicomechanical properties were investigated. Different phosphate resin acids (PRA) were prepared by reacting synthesized phosphate ester acid (PEA) with aliphatic, cycloaliphatic, and aromatic epoxy resins. The chemical structures of the above PEA and PRAs were confirmed by Fourier transform infrared spectroscopy (FTIR), 1H-nuclear magnetic resonance spectroscopy (1H-NMR), and 31P-nuclear magnetic resonance spectroscopy (31P-NMR). Subsequently, transparent IFR coatings were prepared by mixing these PRAs with hexamethoxy methyl melamine resin. Transparency of the coatings was confirmed by UV–Vis–NIR spectrophotometeric studies. Fire protection property and char compressive strength were done to investigate the fire protection ability of the coatings, and the quality of the char formed was analyzed by field emission scanning electron microscope. The decomposition process of prepared fire-retardant coatings was studied by thermogravimetric analysis. Results showed that aliphatic epoxy-based transparent coating produced tough and compact char, but the char height was negligible, and aromatic epoxy-based transparent coating produced soft and fluffy char having excellent char height; however, the fluffy char reduced protection for longer duration. Cycloaliphatic epoxy-based transparent coating produced tough and compact char with good char height, thereby reducing heat transfer during combustion, and also showed superior scratch, abrasion, impact, and water resistance compared to other compositions. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of phosphate resin acid (PRA) - Preparation of coating sample
- CHARACTERIZATION : Characterization of prepared resins - Characterization of transparent coatings - Characterization of char formed
- RESULTS AND DISCUSSION : Thermogravimetric analysis (TGA) - Transparency of coating prepared using PRAs - Physicomechanical properties of transparent IR coatings - Fire resistant test - Characterization of char
- Table 1 : Composition and acid value of prepared resins
- Table 2 : Physicomechanical performance of all PRAs
- Table 3 : Elemental composition of char obtained from the EDAX analysisDOI : https://doi.org/10.1007/s11998-020-00422-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00422-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35613
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