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Influence of radical photoinitiator content on UV curing process and UV-cured hybrid sol–gel films / Anaïs Even in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)
[article]
Titre : Influence of radical photoinitiator content on UV curing process and UV-cured hybrid sol–gel films Type de document : texte imprimé Auteurs : Anaïs Even, Auteur ; Guillaume Vignaud, Auteur ; Nadia Guitter, Auteur ; Nathalie Le Bozec, Auteur ; Philippe Tingaut, Auteur ; Yves Grohens, Auteur Année de publication : 2020 Article en page(s) : p. 333-343 Note générale : Bibliogr. Langues : Américain (ame) Catégories : AlkylTriméthoxysilane
Matériaux -- Propriétés barrières
Matériaux hybrides
Méthacrylates
Nanostructures
Photoamorceurs (chimie)
Photoréticulation
Polyaddition
Revêtements -- Propriétés thermomécaniques
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Sol-gel, ProcédéIndex. décimale : 667.9 Revêtements et enduits Résumé : Hybrid sol–gel coatings are widely used as protective layers for aluminum alloys because of their barrier abilities. This study aims at explaining the barrier properties of a sol–gel coating based on alkyltrimethoxysilane and methacrylate resin by its film structure. This approach was examined by modifying one photopolymerization parameter, e.g., by varying the content of radical photoinitiator. By neutral salt spray test and electrochemical impedance spectroscopy, the barrier properties are highlighted. The film structure is related to thermomechanical properties of films whose glass transition temperature and elastic modulus are measured by dynamic mechanical analysis and nanoindentation, respectively. On a finer scale, conversion of methacrylate functions calculated from Fourier transform infrared spectroscopy has given information on the chemical structure of films. The morphology of these coatings is studied by scanning electron microscopy, transmission electron microscopy, atomic force microscopy operating in tapping mode, and X-ray diffraction. Results revealed that formulations containing between 3 and 9 wt% of radical photoinitiator exhibit the maximal conversion of methacrylate functions and, at a microscopic scale, a homogeneous coating where the two organic and inorganic networks are well interpenetrated. This hybrid sol–gel microstructure corresponds to the highest glass transition temperature and the highest mechanical characteristics (elastic modulus, E and hardness, H) and the highest protection performance. This results in the best barrier properties, and thus the highest corrosion resistance. Note de contenu : - EXPERIMENTAL : Materials - Film preparation - Methods
- RESULTS AND DISCUSSION : Aspect - Barrier properties - Thermomechanical properties - Hybrid micro and nanostructure of UV-cured filmsDOI : https://doi.org/10.1007/s11998-019-00276-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00276-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33985
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Code-barres Cote Support Localisation Section Disponibilité 21658 - Périodique Bibliothèque principale Documentaires Disponible Influence of vinyl-terminated hyperbranched polyester on performance of films obtained by UV-initiated thiol–ene click reaction of A2 + B3 system / Juan Cheng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Influence of vinyl-terminated hyperbranched polyester on performance of films obtained by UV-initiated thiol–ene click reaction of A2 + B3 system Type de document : texte imprimé Auteurs : Juan Cheng, Auteur ; Shiqin Wang, Auteur ; Junheng Zhang ; Menghe Miao ; Daohong Zhang Année de publication : 2018 Article en page(s) : p. 1049-1057 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Chimie click
Composés organiques -- Synthèse
Photoréticulation
Polyesters
Polymères -- Synthèse
Polymères ramifiés
Réaction thiol-ène
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés thermiques
Revêtements -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : UV curing technology has become an efficient method to fabricate films with desirable properties, although it is susceptible to oxygen inhibition, resulting in low conversion of double bonds and poor mechanical performance. Thiol–ene click reaction can overcome the shortcomings of common UV curing techniques. In this paper, the vinyl-terminated hyperbranched polyester (VTDP) was incorporated into the curing system of di-ene (A2) and trithiol (B3). Trithiols, including 1,3,5-tris(2-hydroxyethyl)isocyanurate tris(3-mercaptopropionate) (THMP) and trimethylolpropane tris(3-mercaptopropionate) (TMMP), were synthesized by an esterification between 3-mercaptopropionic acid and 1,3,5-tris(2-hydroxyethyl) isocyanurate, and tri(hydroxymethyl)propane, respectively. The UV-initiated thiol–ene click reaction between 1,4-butanediol diacrylate (BDDA) and trithiols (TMMP and THMP) was researched by adjusting different VTDP content. FTIR spectral analysis showed that the thiol–ene reactions proceeded smoothly and the conversion degree of acrylic groups was higher than that of thiol groups. The pencil hardness and abrasion resistance of the cured film increased first and then decreased with the increase in VTDP content, but both their flexibility and adhesion had little change. Their glass transition temperatures increased slightly with the increase in VTDP content. THMP has better positive effect than TMMP on the pencil hardness, abrasion resistance and thermal performance of the cured film. Note de contenu : - EXPERIMENTAL : Materials - Characterization - Synthesis of trithiol (B3) - Synthesis of vinyl-terminated hyperbranched polyester - Preparation of UV-cured film
- RESULTS AND DISCUSSION : Study of the photocuring process - Mechanical properties of the films - Thermal propertoes of the filmsDOI : 10.1007/s11998-017-0040-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0040-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31128
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Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Initiator-free photopolymerization of an aliphatic vinyl ether-maleimide monomer / Henrik Andersson in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 865 (02/1997)
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Titre : Initiator-free photopolymerization of an aliphatic vinyl ether-maleimide monomer Type de document : texte imprimé Auteurs : Henrik Andersson, Auteur ; Anders Hult, Auteur Année de publication : 1997 Article en page(s) : p. 91-95 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amorceurs (chimie)
Micro-ondes
Photoréticulation
Polymaléimide
Polyvinyl éther
Radicaux libres (chimie)
Réticulation (polymérisation)Index. décimale : 667.9 Revêtements et enduits Résumé : The synthesis and initiator-free photopolymerization of the following aliphatic monomer, containing both a vinyl ether group (electron donor) and a maleimide group (electron acceptor), is described: N-[5-(2-(vinyloxy)ethyloxy carbonyl) pentyl] maleimide (1). The polymerization reaction was followed with UV- and IR-measurements. It was shown that irradiation with a high power microwave lamp, without the presence of photoinitiators, resulted in very fast and efficient curing. This donor-acceptor monomer was also shown to be useful as a photoinitiator for the polymerization of acrylate monomers. Note de contenu :
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Code-barres Cote Support Localisation Section Disponibilité 003534 - Périodique Bibliothèque principale Documentaires Disponible Investigating the efficiencies of cationic photoinitiators / Joanna Ortyl in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4607 (04/2015)
[article]
Titre : Investigating the efficiencies of cationic photoinitiators Type de document : texte imprimé Auteurs : Joanna Ortyl, Auteur ; Mariusz Galek, Auteur Année de publication : 2015 Article en page(s) : p. 24-28 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Iodonium
Photoamorceurs (chimie)
Photoréticulation
Polyaddition
Rayonnement ultraviolet
Revêtements -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : Growing interests in cationic photopolymerisation of monomers as a facile, economic and environmentally safe method for preparation of crosslinked polymer coatings, stimulates search for new photoinitiators. Usually, diaryliodonium salts are used in industry as the cationic polymerisation photoinitiators. However, from a practical point of view, the most important feature of the photoinitiators is their optical characteristics, in particuler the range and extent of light absorption. Nowadays, ail of the iodonium photoinitiators used in industry exhibit similar absorption characteristics and absorb UV light in the range of Xmax = 220-280nm. This creates a technological problem, because there are no economical and simultaneously powerful enough light sources that would emit UV light in that range. In the photocurable coatings industry medium pressure mercury lamps are used, which emit most of their energy at about 365nm and only a fraction is emitted in the absorption range of commercial iodonium photoinitiators. Hence, there is a mismatch between the absorption characteristics of the photoinitiators and the emission characteristics of industriel light sources, which lowers the photo-polymerisation rate. In order to solve that problem, we developed several GalOrti (Photo High Technologies Ltd) iodonium photoinitiators. The performance of the GalOrti photoinitiators in cationic photopolymerisation of an example monomer will be presented using the Fluorescence Probe Technology Method. En ligne : https://drive.google.com/file/d/11TjuKINMNS3xCCyVaN1ryRzcy6-DUHd2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23812
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Code-barres Cote Support Localisation Section Disponibilité 17154 - Périodique Bibliothèque principale Documentaires Disponible Investigation of cure advancement in dual-cure polyurethane-acrylate coatings over metal substrates / Mohsen Sarrafi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)
[article]
Titre : Investigation of cure advancement in dual-cure polyurethane-acrylate coatings over metal substrates Type de document : texte imprimé Auteurs : Mohsen Sarrafi, Auteur ; Babak Kaffashi, Auteur ; Saeed Bastani, Auteur Année de publication : 2018 Article en page(s) : p. 527-534 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composés organiques -- Synthèse
Copolymère uréthane acrylate
Diluants
Fourier, Spectroscopie infrarouge à transformée de
Photoréticulation
Polyesters
Polyols
Revêtements -- Propriétés mécaniques
Revêtements -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : In the present study, a polyurethane acrylate (PUA) system cured via a thermal–UV (dual-cure process) was developed. The system selected for this work was a two-pack polyurethane acrylate with polyester polyol as the main component and urethane monoacrylate (UMA) as hardener. The polyester polyol was synthesized in a way to provide a final film coating containing both a suitable flexibility and high surface hardness. The thermal and photochemical curing behavior of the resin was studied via the chemorheology technique and the real-time FTIR. The Boltzmann sigmoidal model was implemented and well-fitted to the data obtained from the chemorheology measurements. The comparison between two reactive diluents, butanediol diacrylate (BDDA) and trimethylolpropane triacrylate (TMPTA) showed that BDDA reacts faster than TMPTA in the thermal curing condition. Nevertheless, the network buildup is stronger when TMPTA is used. The photopolymerization is also faster for the case of TMPTA. However, its final double bond conversion is restricted to a lower amount due to steric hindrance and higher viscosity of the system. Note de contenu : - EXPERIMENTAL : Materials - Instruments - Synthesis of polyester polyol - Synthesis of urethane monoacrylate - Sample preparation
- RESULTS AND DISCUSSION : Chemorheology - Real-time FTIR
- MECHANICAL PROPERTIESDOI : 10.1007/s11998-017-0008-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0008-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30749
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Code-barres Cote Support Localisation Section Disponibilité 20024 - Périodique Bibliothèque principale Documentaires Disponible Investigation of UV-curable alkyd coating properties / Qianhe Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)
PermalinkKinetics analysis and physical properties of photocured silicate-based thiol-ene nanocomposites : The effects of vinyl POSS ene on the polymerization kinetics and physical properties of thiol-triallyl ether networks / Tolecia S. Clark in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 3 (09/2008)
PermalinkPermalinkLight curing adhesives / Michael Stumbeck in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 196, N° 4502 (07/2006)
PermalinkLight curing adhesives in electronics manufacturing : three case studies / Peter Swanson in ADHESIVES AGE, Vol. 39, N° 13 (12/1996)
PermalinkPermalinkMould release potential of polydimethylsiloxane coatings using photoinitiated polymerisation / David P. Dworak in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B2 (06/2006)
PermalinkMultilayer OLEDs with four slot die-coated layers / Lisa Merklein in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
PermalinkN'est pas Prométhée ou Mary Shelley qui veut / Jean-Claude André in L'ACTUALITE CHIMIQUE, N° 397-398 (06-07/2015)
PermalinkNaphthoylenebenzimidazolone dyes as one-component photoinitiators / Rafal Strzelczyk in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)
PermalinkNew developments in UV radiation curing of protective coatings / C. Decker in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B1 (03/2005)
PermalinkNew photoinitiating systems designed for polymer/inorganic hybrid nanocoatings / Yusuf Yagci in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 2 (03/2012)
PermalinkNIR LEDs and NIR lasers as feasible alternatives / Christian Schmitz in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
PermalinkDe nouveaux procédés de préparation de photopolymères / Jacques Lalevée in L'ACTUALITE CHIMIQUE, N° 456-457-458 (11-12/2020 - 01/2021)
PermalinkNovel photoinitiators - the future of ultraviolet curing technology / Yogesh B. More in PAINTINDIA, Vol. LXIV, N° 11 (11/2014)
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