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Oxazoline-based crosslinking reaction for coatings / Philipp Knospe in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)
[article]
Titre : Oxazoline-based crosslinking reaction for coatings Type de document : texte imprimé Auteurs : Philipp Knospe, Auteur ; Patrick Böhm, Auteur ; Jochen S. Gutmann, Auteur ; Michael Dornbusch, Auteur Année de publication : 2021 Article en page(s) : p. 1199-1207 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique
Auto-réticulation
Catalyseurs
Oxazoline
Polyisocyanates
Polyuréthanes
Réseaux polymères
Réticulants
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Nowadays, coating materials must meet high demands in terms of mechanical, chemical and optical properties in all areas of application. Amongst others, amines and isocyanates are used as crosslinking components for curing reactions, meeting the highly demanding properties of the coatings industry. In this work, a new crosslinking reaction for coatings based on oxazoline chemistry is investigated with the objective to overcome disadvantages of established systems and fulfill the need for sustainable coating compounds. The oxazoline-group containing resin, synthesized from commercially available substances, undergoes cationic self-crosslinking polymerization to build up a network based on urethane and amide moieties. NMR-, IR- and ES-mass spectroscopy are suitable techniques to characterize the synthesized oxazoline monomers, which are linked to polyisocyanates and polymerized afterwards via self-polymerization. The progress of crosslinking is followed by changes in IR spectra and by rheological measurements to calculate time dependent values for storage and loss modulus. The glass transition temperature of the resulting coating is determined, too. Furthermore, sol–gel-analysis is performed to determine the degree of crosslinking. After application on steel and aluminium panels, application tests are performed. In addition to excellent adhesion to the substrate, the polymer network shows promising mechanical properties and with that it could represent a new technology for the coatings industry. Note de contenu : - Raw materials
- Analytical methods
- Synthesis of the compounds
- Polyisocyanate-oxazoline adduct 2
- Application testing
- Table 1 : Screening of different catalysts using curing temperatures 190°C and 160°C
- Table 2 : Coating properties at different curing temperatures using various catalystsDOI : https://doi.org/10.1007/s11998-021-00479-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00479-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36425
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Code-barres Cote Support Localisation Section Disponibilité 22991 - Périodique Bibliothèque principale Documentaires Disponible Parallel measurements and engineering simulations of conversion, shear modulus, and internal stress during ambient curing of a two-component epoxy coating / Qiong Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)
[article]
Titre : Parallel measurements and engineering simulations of conversion, shear modulus, and internal stress during ambient curing of a two-component epoxy coating Type de document : texte imprimé Auteurs : Qiong Li, Auteur ; Claus Erik Weinell, Auteur ; Søren Kiil, Auteur Année de publication : 2022 Article en page(s) : P; 1331-1343 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique
Cinétique chimique
Dynamique
Epoxydes
Modèles mathématiques
Réticulation (polymérisation)
Revêtements bi-composant
Revêtements organiques
Rhéologie
Taux de retrait
ThermodurcissablesIndex. décimale : 667.9 Revêtements et enduits Résumé : Macroscopic crack initiation and propagation, as a result of internal stress, poses a threat to the performance of protective coatings. In demanding environments, such as corner geometries and saltwater exposure, the cracks may accelerate substrate corrosion and potentially lead to collapse of infrastructure. The present work is focused on the underlying mechanisms of curing-induced internal stress and investigates the dynamics of the parallel processes of crosslinking reactions and evolution of mechanical properties for a solvent and pigment-free epoxy resin cured with a diamine hardener. Experimental techniques, applied at room temperature and constant relative humidity, include attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy, advanced rheometry, dynamic mechanical thermal analysis (DMTA), and a beam deflection device. When taking post-vitrification mobility control into account, the reaction kinetics behind the crosslinking and network development could be simulated with a modified Kamal–Sourour model. In addition, engineering models for simulation of coating modulus, volumetric shrinkage, and internal stress as a function of conversion were proposed and found to be in good agreement with experimental data. This allowed, by comparing the magnitudes of the modulus and the internal stress, for evaluation of whether premature cracks are expected to initiate. Furthermore, we show that the curing-induced internal stress development is strongly influenced by the current coating elastic modulus and film thickness, highlighting the effect of coating property transients. The experimental techniques and engineering modeling tools collected can be used to evaluate, without demanding computational complexities, the simultaneous development of coating modulus and curing-induced internal stress. Note de contenu : - EXPERIMENTAL : Materials and coating preparation - FTIR spectroscopy - Dynamic mechanical thermal analysis (DMTA) measurements - Tensile test - Curing shrinkage measurement - Internal stress measurements
- MATHEMATICAL MODELING : Curing kinetics - Chemical strain model - Elastic behavior of coating
- RESULTS AND DISCUSSION : Evolution of coating properties during curing - Comparison of model simulations with experimental dataDOI : https://doi.org/10.1007/s11998-022-00652-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00652-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38273
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Code-barres Cote Support Localisation Section Disponibilité 23672 - Périodique Bibliothèque principale Documentaires Disponible Phase separation in Michael addition curable coatings to enhance flexibility and adhesion robustness / Bart A. J. Noordover in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)
[article]
Titre : Phase separation in Michael addition curable coatings to enhance flexibility and adhesion robustness Type de document : texte imprimé Auteurs : Bart A. J. Noordover, Auteur ; Yujing Zhang, Auteur ; Richard Brinkhuis, Auteur ; Martin Bosma, Auteur ; Florian Lunzer, Auteur ; Patrice Roose, Auteur ; Luc Lindekens, Auteur Année de publication : 2023 Article en page(s) : p. 1835-1844 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Analyse thermomécanique dynamique
Caractérisation
Formulation (Génie chimique)
Michael, Addition deL'addition de Michael ou réaction de Michael est une réaction qui permet la création de liaisons carbone-carbone, voire de liaisons carbone-soufre. Il s'agit de l'addition nucléophile d'un carbanion sur un composé carbonylé α,β insaturé (aldéhyde, cétone et même ester α,β insaturé, des nitriles et des amides α,β insaturés pouvant aussi être utilisés). Elle appartient à la famille des additions nucléophiles conjuguées.
Cette réaction doit son nom au chimiste américain Arthur Michael.
Polyester maloné
Réticulation (polymérisation)
Revêtements organiques
Séparation de phases
Souplesse (mécanique)
Vernis -- Propriétés mécaniquesIndex. décimale : 667.7 Cires, laques, vernis Résumé : Polyether-based acryloyl-functional acceptor binders were combined with malonated polyester donor resins in base-catalyzed carbon-Michael addition curable paint systems. The high equivalent weight, flexible polyether-based acceptors afford a multi-phase morphology in the final coating film, which is formed through polymerization-induced incompatibility and phase separation. Additional thermal transitions were observed in dynamic mechanical thermal analysis experiments, indicating the presence of low Tg domains in the highly crosslinked continuous phase. As a consequence, these novel network compositions show strongly improved ductility and adhesion robustness over a range of substrate types. Non-reactive polyether-based binders, lacking covalent bonding to the crosslinked continuous phase, only lead to limited, less robust property improvement. It was demonstrated that acceptor binders based on poly(propylene glycol) segments are highly effective in enhancing flexibility while maintaining a high coating hardness. Both clearcoat and pigmented topcoat formulations were developed showing similar performance improvements, opening the door to benefits in a variety of application fields. Note de contenu : - Experimental section : Materials
- Preparation of malonated polyester MPE1
- RMA coating formulation and application
- Characterization methods
- Results and discussion : Polymerization-induced phase separation using acryloyl-functional polyethers - Mechanical and adhesion properties of multi-phase RMA curable compositions - RMA reactive vs non-reactive polyether segments - Reactive polyether-containing pigmented RMA curable compositions
- Table 1 : Michael addition curable clearcoat formulation containing PPG2k UA
- Table 2 : Polyether-based UAs studied in RMA coatings
- Table 3 : Testing results of multi-phase RMA curable compositions
- Table 4 : Testing results of multi-phase RMA curable compositions
- Table 5 : Adhesion testing results on different types of substrates for pigmented Michael addition curable compositions based on MPE and DiTMPTA + acceptor resin 2 (% on total resin solids), using a carbonate-blocked strong base as catalystDOI : https://doi.org/10.1007/s11998-023-00804-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00804-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40164
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Code-barres Cote Support Localisation Section Disponibilité 24337 - Périodique Bibliothèque principale Documentaires Disponible Phytic acid oligomers as bio-based crosslinkers for epoxy and polyol resins / P. Böhm in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)
[article]
Titre : Phytic acid oligomers as bio-based crosslinkers for epoxy and polyol resins Type de document : texte imprimé Auteurs : P. Böhm, Auteur ; M. Dornbusch, Auteur ; J. S. Guttmann, Auteur Année de publication : 2024 Article en page(s) : p. 355-367 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique
Biopolymères
Caractérisation
Epoxydes
Oligomères
Phytique, Acide
Polymères -- Synthèse
Polyols
Ressources renouvelables
Réticulants
Réticulation (polymérisation)
Revêtements organiques
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : In recent years, the chemical industry is not only striving to produce the best possible products for various applications, but the new products should ideally be based on renewable resources. The ideal case of "cradle to cradle" is generally not achievable in the coatings industry, as maximizing product life and preventing product degradation in the environment is usually one of the main goals of the coatings industry. Therefore, if the coatings industry wants to act sustainably, its efforts should be focused on renewable raw materials. This paper presents a process that makes the renewable raw material phytic acid easily accessible for conventional epoxy and polyol resin coating systems through hydrophobization- and oligomerization. Phytic acid, as a phosphorus reservoir in plants and with beneficial properties for corrosion protection and as a flame retardant, could be a new base for various coatings. In this work, a simple one-pot oligomerization of phytic acid with green mono- and difunctional alcohols is investigated. The aim of this work is to create a phytic acid hardener system based on renewable raw materials that can produce coatings with solvent-based epoxy and polyol binders as well as water-based epoxy binders. The successful reaction was observed by infrared, 1H-NMR, and 31P-NMR spectroscopy and the acid equivalent weight was determined by conductivity titration. The renewable curing agent was then used equivalently with different binder systems to prepare coatings. Crosslinking and glass transition temperature were monitored using oscillatory rheology. The coatings were applied to glass plates and the pendulum hardness was measured. A simple heating test followed by 31P-NMR and IR spectroscopy was also performed to demonstrate the stability of phytic acid under reaction conditions. Note de contenu : - EXPERIMENTAL : Analytical methods - Materials - Synthesis - Synthesis overview - Thermal stability - Network formation - Pigment paste preparation - Additional measurements
- RESULTS AND DISCUSSION : Thermal stability - Synthesis and characterization - Network formation - Application testing - Dispersing and hardening agent
- Table 1 : Theoretical composition of the PA-oligomers
- Table 2 : Application data of various PA-oligomers with different binders
- Table 3 : Color measurement of dried pigment pastes
- Table 4 : Application data of PA-oligomer/ Bayferrox 130 M pigment paste with different bindersDOI : https://doi.org/10.1007/s11998-023-00827-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00827-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40458
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Code-barres Cote Support Localisation Section Disponibilité 24443 - Périodique Bibliothèque principale Documentaires Disponible Polyoxymethylene/polyhedral oligomeric silsesquioxane composites : processing, crystallization, morphology and thermo-mechanical behavior / D. Czarnecka-Komorowska in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 5 (11/2016)
[article]
Titre : Polyoxymethylene/polyhedral oligomeric silsesquioxane composites : processing, crystallization, morphology and thermo-mechanical behavior Type de document : texte imprimé Auteurs : D. Czarnecka-Komorowska, Auteur ; T. Sterzynski, Auteur ; M. Dutkiewicz, Auteur Année de publication : 2016 Article en page(s) : p. 598-606 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Analyse thermomécanique dynamique
Cristallisation
Microscopie électronique à balayage
Morphologie (matériaux)
Polyoxyméthylène
Silsesquioxanes oligomères polyhèdresIndex. décimale : 668.4 Plastiques, vinyles Résumé : Polyoxymethylene composites with octakis (dimethylsiloxy, ethyl epoxycyclohexy)octasilsesquioxanes and octakis(dimethylsiloxy, vinyl)octasilsesquioxanes contents (0.5 and 1 wt.%) were studied. The effect of silsesquioxanes (POSS) on crystallization and melting behaviour of polyoxymethylene (POM) was investigated by polarized light microscope (PLM), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM), with the aim to determine the structural properties like crystallization temperature, degree of crystallinity and lamellar thickness distributions. It was found that POSS as nucleating agent affects the crystallization process of POM, leading to a homogeneous structure, improving the thermo-mechanical properties of polyoxymethylene composites. Based on SEM observations it was found that the POSS particles in a concentration of 0.5 wt.% are uniformly dispersed in polyoxymethylene matrix. The storage modulus and relaxations temperatures of POM with POM/0.5 wt.% ehPOSS and vinPOSS are slightly increased. Note de contenu : - EXPERIMENTAL : Materials - Processing and molding conditions of POM/POSS composites - Differential scanning calorimetry (DSC) - Polarized light microscope (PLM) - Scanning electron microscopy (SEM) - Dynamic mechanical thermal analysis (DMTA)
- RESULTS AND DISCUSSION : Crystallization and melting properties - PLM morphology analysis - Dynamic mechanical properties analysis - SEM analysisDOI : 10.3139/217.3243 En ligne : https://drive.google.com/file/d/1o96jOA47zJ-za57Ol3O4ISaC-hpEG6oc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27397
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Code-barres Cote Support Localisation Section Disponibilité 18491 - Périodique Bibliothèque principale Documentaires Disponible Preparation and properties of anti-biofouling zwitterionic polyurethane leather coating / Wang Chunhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 1 (01-02/2017)
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