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An A2 + CB2 approach to the synthesis of hyperbranched polyester polyol and application in PU coatings / Amardip M. Patil in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 3 (05/2024)
[article]
Titre : An A2 + CB2 approach to the synthesis of hyperbranched polyester polyol and application in PU coatings Type de document : texte imprimé Auteurs : Amardip M. Patil, Auteur ; Dhammanand J. Shirale, Auteur ; Harishchandra D. Jirimali, Auteur ; Ramanand N. Jagtap, Auteur Année de publication : 2024 Article en page(s) : p. 1085-1095 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse morphologique
Caractérisation
Enrobage (technologie)
Polymères -- Synthèse
Polymères ramifiés
Polyuréthanes
Résistance chimique
Revêtements -- Analyse
Revêtements organiques
Stabilité thermique
Surfaces -- AnalyseIndex. décimale : 667.9 Revêtements et enduits Résumé : In the present work, neopentyl glycol was used as a core for the synthesis of hyperbranched polymer by melt condensation polymerization with 2,2-Bis(hydroxymethyl) propionic acid. The A2 + CB2 synthetic method was used where neopentyl glycol was A2 and 2,2-Bis(hydroxymethyl) propionic acid was CB2. The acid value and hydroxyl values of the synthesized hyperbranched polymer were determined according to ASTM D974 and ASTM D4274, respectively. The molecular structural characterizations of hyperbranched polyol were determined by FTIR and NMR spectroscopy techniques. The hyperbranched polyurethanes were synthesized by using hyperbranched polyol and crosslinking agent isophorone diisocyanate in different mole ratios of OH:NCO (1:1.2, 1:1.4, 1:1.6). These mixtures were used as coating materials on mild steel panels and glass plates. The coating properties of polyurethanes such as gloss and cross-cut adhesion were studied. The immersion test of coatings was carried out in HCl, NaCl, NaOH and water. The electrochemical properties of the coatings were examined using an electrochemical method in electrolytes consisting of HCl, NaOH, and NaCl. Thermal stability and surface morphology were studied by TGA and SEM, respectively. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of hyperbranched polyester polyol (HBP) from neopentyl glycol (NG) - Preparation of hyperbranched polyurethane (HBPU) - Characterizations - Functional group analysis - Structural study - Coating properties - Chemical resistance - Electrochemical study - Thermogravimetric study - Study of scanning electron microscopy images
- RESULTS AND DISCUSSION : Study of FTIR and NMR spectra - Coating properties - Chemical resistance - Electrochemical study of the HBPU coatings - Thermogravimetric analysis of HBPU - Study of scanning electron microscopy imagesDOI : https://doi.org/10.1007/s11998-023-00875-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00875-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41078
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Code-barres Cote Support Localisation Section Disponibilité 24737 - Périodique Bibliothèque principale Documentaires Disponible 24688 - Périodique Bibliothèque principale Documentaires Disponible Biodegradability study of footwear soling materials in simulated compost environment / Moumita Mukherjee in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 2 (02/2021)
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Titre : Biodegradability study of footwear soling materials in simulated compost environment Type de document : texte imprimé Auteurs : Moumita Mukherjee, Auteur ; T. Loganathan, Auteur ; Sujata Mandal, Auteur ; G. Saraswathy, Auteur Année de publication : 2021 Article en page(s) : p. 58-68 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse morphologique
Analyse thermique
Caractérisation
Compostage
Cuirs et peaux -- Biodégradation
Essais (technologie)
Semelles
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Aim of the present study is to investigate the biodegradability and decomposing properties of footwear soling materials by standard biodegradability test method. Biodegradability tests were performed by aerobic exposure of the selected six soling materials to the soil matrix and measuring the degradation and decomposition occurred with time. All soling materials were characterized for physical and physicochemical properties such as weight loss, hardness, density, tensile strength, abrasion resistance, thermal and morphological properties before and after exposing to the simulated compost environment. In the present study, the end-of-life nature of footwear soling materials currently used by the footwear industries are explored, which will further emphasize the importance of development and use of biodegradable materials in the footwear manufacturing. Note de contenu : - MATERIALS : Compost composition
- METHOD
- CHARACTERIZATION
- RESULTS AND DISCUSSION : Physical properties - ATR-FTIR - Thermal analysis (TGA and DSC) - Morphological analysisDOI : https://doi.org/10.34314/jalca.v116i2.4236 En ligne : https://drive.google.com/file/d/1hGALbjVyBKtlnBf-tTq4WJSivbSx9XBY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35309
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Code-barres Cote Support Localisation Section Disponibilité 22600 - Périodique Bibliothèque principale Documentaires Disponible Biomass-based tanning agent for sustainable leather manufacture via cyanuric chloride modified chitooligosaccharide / Min Jiang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 10 (10/2023)
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Titre : Biomass-based tanning agent for sustainable leather manufacture via cyanuric chloride modified chitooligosaccharide Type de document : texte imprimé Auteurs : Min Jiang, Auteur ; Yuanhang Xiao, Auteur ; Jun Sang, Auteur ; Chunhua Wang, Auteur ; Jiajing Zhou, Auteur ; Wei Lin, Auteur Année de publication : 2023 Article en page(s) : p. 417-427 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage
Analyse morphologique
Biomasse
Caractérisation
Chitooligosaccharide
Composés organiques -- Synthèse
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
PoidsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Developing alternative tanning agents to avoid the potential environmental and human health risks from the conventional chrome tanning is essential for the leather industry. In this work, we prepared an eco-friendly biomass-based tanning agent dichlorotriazinyl chitooligosaccharide (DTCS) by modifying chitooligosaccharide (COS) with cyanuric chloride (CC) for chrome-free leather manufacture. The synthesis of such biomass-based tanning agent was systematically optimized to obtain the target product with high grafting degree of 67% and weight-average molecular weight (Mw) of 1465 g/mol. The non-pickling tanning procedure using DTCS was investigated, and the interactions between DTCS and collagen fibers were studied. Our results showed that the hydrothermal stability of the tanned leather was significantly increased, i.e., the shrinkage temperature (Ts) exceeding 82.0°C, and the mechanical properties were improved. Moreover, the organoleptic properties of leather (e.g., fullness, softness and grain tightness) exhibited obvious improvement. This research not only offers a reliable approach for cleaner leather manufacturing while addressing the underlying ecological pressure, but also highlights the emerging use of biomass materials in the leather industry. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of DTCS - Determination of grafting degree (GD) of DTCS - Characterization of DTCS - DTCS tanning trials - Leather properties analysis
- RESULTS AND DISCUSSION : Optimization of DTCS synthesis condition - Characterization of DTCS - Optimizatin of DTCS tanning process - Leather morphology anlaysis - Thickening rate analysis - Physical and organoleptic properties analysis
- Table 1 : Tanning process for DTCS
- Table 2 : Tanning process for F-90
- Table 3 : The average molecular weight and molecular-weight distribution of COS and DTCS - Table IV : The optimum tanning process of DTCSDOI : https://doi.org/10.34314/jalca.v118i10.8230 En ligne : https://drive.google.com/file/d/1csGAWb8R-ZPLSmdInoTLfYTzOcUHK0KN/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39940
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 10 (10/2023) . - p. 417-427[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24241 - Périodique Bibliothèque principale Documentaires Disponible Damage morphology and force-deflection curves for impact loading of thick multilayer organic protective coating systems / A. W. Momber in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 3 (05/2024)
[article]
Titre : Damage morphology and force-deflection curves for impact loading of thick multilayer organic protective coating systems Type de document : texte imprimé Auteurs : A. W. Momber, Auteur ; M. Irmer, Auteur ; D. Kelm, Auteur ; V. Cherewko, Auteur Année de publication : 2024 Article en page(s) : p. 857-878 Note générale : Errata. Author correction p. 1171 - Bibliogr. Langues : Américain (ame) Catégories : Analyse de dommages (matériaux)
Analyse morphologique
Endommagement (mécanique)
Essais de résilience
Essais dynamiques
Impact (mécanique)
Revêtements -- Fissuration
Revêtements multicouches
Revêtements organiques
Structures offshoreIndex. décimale : 667.9 Revêtements et enduits Résumé : The response of organic coatings to mechanical impact is crucial to their corrosion protection performance, particularly under offshore conditions. The paper categorizes and discusses four different types of response during the high-energy (3 to 20 J) impact of a falling ball-shaped weight on 14 multilayer organic offshore coating systems. The response types include plastic deformation, brittle (compressive) crushing, radial crack formation, and lateral delamination. Threshold and transition conditions are analyzed based on contact mechanics relationships. For the first time, complete force-deflection curves for this type of coating are recorded with an instrumented impact tester. The curves feature four characteristic points, namely a first local force maximum (FFS), the respective deflection at this force level (δFS), a maximum force (Fmax), and the respective deflection at this maximum force (δmax). These characteristic parameters are discussed in terms of coating system composition. Empirical equations for these parameters as well as for the damage size are derived. The results offer opportunities to quantitatively rank organic coatings with respect to their impact resistance. Note de contenu : - MATERIALS AND EXPERIMENTAL SETUP : Investigated coating systems - Impact testing device
- RESULTS AND DISCUSSION : Damage patterns - Force-deflection diagrams - Damage size
- Appendix : Damage morphologies and force-deflection curvesDOI : https://doi.org/10.1007/s11998-023-00829-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00829-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41063
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Code-barres Cote Support Localisation Section Disponibilité 24737 - Périodique Bibliothèque principale Documentaires Disponible 24688 - Périodique Bibliothèque principale Documentaires Disponible Effect of alumina particles on the mechanical and physical properties of polypropylene whisker reinforced lamination 80:20 Resin composite / Ali Faraj Hammadi in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 1 (02/2023)
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Titre : Effect of alumina particles on the mechanical and physical properties of polypropylene whisker reinforced lamination 80:20 Resin composite Type de document : texte imprimé Auteurs : Ali Faraj Hammadi, Auteur ; Ahmed H. Oleiwi, Auteur ; Abdalameer Tariq Abbas, Auteur ; Anwer J. Al-Obaidi, Auteur Année de publication : 2023 Article en page(s) : p. 7-12 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alumine
Analyse morphologique
Caractérisation
Composites à fibres -- Propriétés mécaniques
Composites à fibres -- Propriétés physiques
Composites à fibres synthétiques
Epoxydes
Particules (matières)
Polypropylène
StratifiésIndex. décimale : 668.4 Plastiques, vinyles Résumé : The low cost, relatively high fibre strength, and low density of polypropylene (PP) fibres make them an attractive candidate for reinforcing low-cost composite materials for various applications. The use of particles in fibre-reinforced composite structures usually improves the strength of the basic material. Alumina (Al2O3), with its unique properties, has been used to improve the composite material's properties. It is crucial to determine the appropriate concentration of Al2O3 particles that can be added to Polypropylene whisker/epoxy composites to get the required mechanical and physical properties. In this study lamination 80:20 resin was used as a matrix material to prepare a Polypropylene whisker (3%wt.) reinforced lamination 80:20 resin (PP/resin) composite. The composite materials were manufactured by hand lay-up method. Different concentrations (1, 3, 5, 7 & 10wt.%) of alumina (Al2O3) particles, were used to reinforce the composite. The composite materials are prepared with standard sizes according to the tests, the tests include mechanical tests (tensile, impact, and hardness test) and physical tests (water absorption and density). The tests results showed an improvement in tensile strength, elongation, toughness, fracture toughness, hardness and density, while the water absorption diminishes concerning an increase in the concentration of the Al2O3 particles. The tensile strength, elongation, elastic modulus, hardness and density improved from (17 MPa, 1.3%, 1.13GPa, 70 Shore D and 0.93gm/cm3) respectively for neat lamina and reach the maximum value (34.5 MPa, 3.1%, 1.47 GPa, 83 Shore D and 1.01 gm/cm3) respectively at (3%wt. PP and 10%wt. Al2O3), while the toughness and fracture toughness improved from (3.8 KJ/m2 and 0.06 MPa.m1/2) respectively for neat lamina and reach the maximum value (23.1 KJ/m2 and 0.19 MPa.m1/2) respectively at (3%wt. PP and 7%wt. Al2O3). Note de contenu : - Materials and Methods
- Characterization
- Result and Discussion : Mechanical properties - Morphology characterization
- Table 1 : Properties of lamination resin 80:20DOI : https://doi.org/10.18280/rcma.330102 En ligne : https://iieta.org/download/file/fid/91628 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39260
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