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]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1049-1057 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 ultraviolet Index. 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 films DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31128 [article]

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POSS-vinyl-urethane acrylate-based nanohybrid coating materials / Yasemin Eren in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 2 (03/2024) . - p. 575-587 Titre : POSS-vinyl-urethane acrylate-based nanohybrid coating materials Type de document : texte imprimé Auteurs : Yasemin Eren, Auteur ; Ferhat Sen, Auteur ; Suzan Abdurrahmanoglu, Auteur ; Sevim Karatas, Auteur Année de publication : 2024 Article en page(s) : p. 575-587 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère uréthane acrylique Formulation (Génie chimique) Matériaux hybrides Polymères -- Propriétés chimiques Polymères -- Propriétés thermiques Réaction thiol-ène Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Silsesquioxanes oligomères polyhèdres Index. décimale : 667.9 Revêtements et enduits Résumé : The effect of POSS-vinyl-heptaisobutyl-substituted (POSSV) compounds as an inorganic additive on the thermal and physical properties of nanohybrid coating materials based on urethane acrylate (UA) resin has been investigated. A diol compound obtained from the reaction of itaconic acid and 1,2-epoxy cyclohexane has been used to produce an UV curable epoxy-based urathane acrylate resin. Nanohybrid coating materials were obtained by curing the UA resin with UV radiation through the thiol–ene reaction, mixed with various amounts of POSSV compounds. The structure of the UA resin was characterized by Fourier-transform infrared spectroscopy and nuclear magnetic resonance spectroscopy techniques. The UV curing process was also studied by the double bond conversion method. Aggregation of the nanohybrid materials was determined by X-ray diffraction. The thermal, non-flammability, and thermomechanical properties of the samples were examined by thermogravimetric analysis, limiting oxygen index, and dynamic mechanical analysis techniques. Light transmittance of the samples was determined by UV–Vis spectrophotometry, and their morphological structure was determined by scanning electron microscopy. In addition, gel contents, swelling rates, hardness, adhesion, contact angles, and resistance to chemicals and solvents of the samples were examined. In conclusion, nanohybrid materials obtained from the synthesized UA resin and improved with POSSV additive can be used in the coating industry. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of epoxy-based urethane acrylate resin - Preparation of UV curable nanohybrid coating materials - Characterization - RESULTS AND DISCUSSION : Structures characterization of UA resin - Double bonds conversion of UA resin and nanohybrid materials - XRD analysis of UA resin and nanohybrid materials - Thermal properties of UA resin and nanohybrid materials - Optical properties of UA resin and nanohybrid materials - Physical characterization of UA resin and nanohybrid materials - Chemical and solvent resistance of UA resin and nanohybrid materials - Morphologies of UA resin and nanohybrid materials - Table 1 : Formulations of nanohybrid coatings materials - Table 2 : Thermal properties of UA resin and nanohybrid materials - Table 3 : Transmittance of UA resin and nanohybrid materials - Table 4 : Physical characterization of UA resin and nanohybrid materials - Table 5 : Chemical resistance of UA resin and nanohybrid materials - Table 6 : Solvent resistance of UA resin and nanohybrid materials DOI : https://doi.org/10.1007/s11998-023-00839-7 En ligne : https://drive.google.com/file/d/1_6e47gmTESBx1ckg4qXRI-gdNPTg3Iuw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40778 [article]

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Preparation and characterization of a novel ultraviolet/thermal dual-curing thiol-ene/polyurethane acrylate coating / Dijun Huang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 4 (07/2021) . - p. 1109-1116 Titre : Preparation and characterization of a novel ultraviolet/thermal dual-curing thiol-ene/polyurethane acrylate coating Type de document : texte imprimé Auteurs : Dijun Huang, Auteur ; Yongxia Ren, Auteur ; Ruoning Yang, Auteur ; Zhiguo He, Auteur ; Youwei Yao, Auteur Année de publication : 2021 Article en page(s) : p. 1109-1116 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère uréthane acrylate Dureté (matériaux) Formulation (Génie chimique) Photoréticulation Réaction thiol-ène Temps de séchage Index. décimale : 667.9 Revêtements et enduits Résumé : A novel ultraviolet (UV)/thermal dual-curing thiol-ene/polyurethane acrylate (PUA) coating of PUA oligomer, tripropylene glycol diacrylate, 2,4,6-trimethylbenzoyldiphenyl phosphine oxide, and trimethylolpropane tris (3-mercaptopropionate) was prepared. The coating had a rapid surface drying rate with UV radiation (400 W, 50 W/cm2). For example, the surface of the novel thiol-ene/PUA coating dried within 3 s. The hardness, gel content, and initial decomposition temperature at 5 wt% weight loss of the UV/thermal dual-cured sample after 10 min of UV irradiation, followed by heating at 150°C for 20 min, were 37 D, 90.3%, and 302.2°C, respectively, which were higher than the 30 D, 87.7% and 284.9°C of the UV curing control after 10 min of UV irradiation. The curing time of the 1-mm-thick coating was 4.5 min in indoor sunlight (2.3 ± 0.3 mW/cm2) with a gel content of 83.8%. This coating could be applied in the rapid prototyping field with UV or sunlight exposure. Thermal treatment after UV curing could increase the crosslinking degree and influence the sample performance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of thiol-ene/polyurethane acrylate coatings - Preparation of cured samples - Characterization - RESULTS AND DISCUSSION : FTIR characterization - Surface drying time with UV irradiation and curing time in sunlight - Gel fraction - Hardness - Thermal stability - Dynamic mechanical thermal performance - Table 1 : Detailed formulations of coatings 1/2 - Table 2 : Surface drying time of coatings 1/2 with UV irradiation - Table 3 : Actual curing time of coatings 1/2 in indoor sunlight - Table 4 : Gel content of cured samples of thiol-ene/PUA coating 1 - Table 5 : Hardness of cured samples - Table 6 : Thermal properties of different samples under Ar - Table 7 : DMTA properties and crosslink density of thiol-ene/PUA-cured samples DOI : https://doi.org/10.1007/s11998-021-00464-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00464-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36217 [article]

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Roll-to-roll micromolding ov UV curable coatings / Yuyang Du in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 3 (05/2021) . - p. 627-639 Titre : Roll-to-roll micromolding ov UV curable coatings Type de document : texte imprimé Auteurs : Yuyang Du, Auteur ; Krystopher S. Jochem, Auteur ; Nitika Thakral, Auteur ; Alon V. McCormick, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2021 Article en page(s) : p. 627-639 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Analyse spectrale Caractérisation Formulation (Génie chimique) Micromoulage Réaction thiol-ène Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Traitement rouleau à rouleau Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, fast and continuous fabrication of microscale structures by roll-to-roll UV imprinting or micromolding is demonstrated on a 121 mm wide web. This process is enabled by a UV curable thiol-ene-acrylate resin system, following the work of Stadlober and coworkers. A series of formulations were prepared with fast curing speeds at ambient conditions, low viscosities, and tunable mechanical properties. The rate and extent of curing as a function of the formulation composition were investigated with Fourier transform infrared spectroscopy. Consistent with the past work, we show that the thiol-ene-acrylate formulations reached high double bond conversions (> 80%) with the maximum conversion increasing with the relative thiol content and decreasing with the viscous urethane acrylate oligomer content. The double bond conversion of the patterned coatings (in contact with the mold) is shown to be ~ 80% for a range of UV lamp powers and web speeds up to 2.7 cm/s. Areas of the coating not covered by the mold required higher UV lamp power and/or lower web speeds to cure to a tack-free state. Microscale channels and arrays of recessed wells with various dimensions and pattern densities were continuously fabricated. Our findings show the successful use of a tetrafunctional thiol in the thiol-ene-acrylate resin system. We also discuss guidelines for the selection of processing conditions for the manufacturing of structured plastic substrates using roll-to-roll imprinting processes, opening up potential new applications. Note de contenu : - EXPERIMENTAL : Materials - Dynamic viscosity - FTIR spectroscopy - Dynamic mechanical analysis - Preparation of PDMS mold - R2R imprinting or micromolding - RESULTS AND DISCUSSION : Formulation characterization - R2R UV micromolding - Table 1 : Compositions of R2R UV micromolding formulations DOI : https://doi.org/10.1007/s11998-020-00467-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00467-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35917 [article]

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Surface modification of nanosilica with 3-mercaptopropyl trimethoxysilane and investigation of its effect on the properties of UV curable coatings / Jianbing Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 6 (11/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 6 (11/2013) . - p. 549-857 Titre : Surface modification of nanosilica with 3-mercaptopropyl trimethoxysilane and investigation of its effect on the properties of UV curable coatings Type de document : texte imprimé Auteurs : Jianbing Wu, Auteur ; Junbao Xie, Auteur ; Lixia Ling, Auteur ; Guozhang Ma, Auteur ; Baojun Wang, Auteur Année de publication : 2013 Article en page(s) : p. 549-857 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cinétique chimique Nanoparticules Réaction thiol-ène Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultraviolet Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : This paper describes surface modification of commercial nanosilica with 3-mercaptopropyl trimethoxysilane (MPTMS) and its effect on the properties of UV curable coatings. The mercapto groups were grafted onto nanosilica surface by a condensation of the surface Si–OH with the hydrolysized Si–OH of MPTMS. Fourier transform infrared spectroscopy, thermal gravimetric analysis, and particle size distribution were employed to characterize nanosilica and modified nanosilica. It was demonstrated that the mercapto groups were successfully grafted onto the nanosilica surface with the grafting ratio of 16.8% and the mercapto groups content of 0.9 mmol/g. The dispersion and self-aggregation of nanosilica in UV curable coatings were improved significantly. The photopolymerization kinetics of UV curable coatings, containing various amounts of nanosilica and modified nanosilica, were evaluated by the photo differential scanning calorimetry technique. This indicated that nanosilica both before and after modification decreased UV curing speed and ultimate percentage conversion; however, in comparison with the coatings containing unmodified nanosilica, the coatings containing modified nanosilica exhibited higher curing speeds and conversion ratios. It can be ascribed that the mercapto groups on the nanosilica surface reduced oxygen inhibition during the UV curing process via the thiol–ene click reaction. The mechanical properties of UV curable coatings were also compared. Note de contenu : - EXPERIMENTAL : Materials - Surface modification of nanosilica with MPTMS - Preparation of UV curable coatings - Characterizations - RESULTS AND DISCUSSION : Preparation and characterization of modified nanosilica - Effect of modified nanosilica on the curing kinetics - Effect of modified nanosilica on the properties of UV curable coatings DOI : 10.1007/s11998-013-9525-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9525-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19824 [article]

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Synthèse de polyuréthanes à partir d'huiles végétales fonctionnalisées par la réaction thiol-ène in MATERIAUX & TECHNIQUES, Vol. 100, N° 5 (2012)  

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The third way / Nobuhiko Sakai in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8 (07-08/2018)  

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