Irradiation-cured graphene composite films : a comparison between UV and EB curing / Ziyue Wei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 5 (09/2023) . - p. 1713-1726 Titre : Irradiation-cured graphene composite films : a comparison between UV and EB curing Type de document : texte imprimé Auteurs : Ziyue Wei, Auteur ; Lingyun Wang, Auteur ; Ren Liu, Auteur ; Jing Luo, Auteur Année de publication : 2023 Article en page(s) : p. 1713-1726 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Graphène Le graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur. Matériaux hybrides Mesure Revêtements -- Séchage sous rayonnement électronique Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, a series of graphene-based composite films were prepared via electron beam (EB) or ultraviolet (UV) irradiation. The influence of the graphene content as well as the irradiation dose on the curing behavior and properties of EB/UV-cured graphene composite films was systematically studied. The curing behavior of the composite films was investigated by the double bond conversion rate as well as the gel content, and the properties of the composite films were studied by TGA analysis and tensile tests. For EB-cured graphene composite films, the curing degree increased with the increase in the irradiation dose (60–360 kGy), and the upper and lower surface was uniformly cured. The curing degree and curing depth of the EB-cured films were not affected by the addition of graphene (0.0–5.0 wt.%). Compared to pure resin film, the EB-cured graphene composite film showed enhanced tensile properties. For UV-cured graphene composite films, the curing degree was also enhanced with the increasing irradiation dose, but it decreased significantly with the increase in graphene content (0.0–5.0 wt.%). The curing degrees of upper and lower surfaces of the UV-cured graphene composite film were not uniform, and the curing depth decreased with the increase in graphene concentration. The addition of graphene had an adverse effect on the thermal and mechanical properties of the UV-cured composite film. Note de contenu : - EXPERIMENT : Materials - The preparation of graphene composite films via UV/EB curing - Characterization and measurement - RESULTS AND DISCUSSION : Curing Behavior of graphene composite films - Properties of irradiation-cured graphene composite films - Table 1 : The curing depths of EB-cured graphene composite films - Table 2 : The curing depths of UV-cured graphene composite films Properties of irradiation-cured graphene composite films DOI : https://doi.org/10.1007/s11998-023-00776-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00776-5.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39983 [article]

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Novel partially bio-based fluorinated polyimides from dimer fatty diamine for UV-cured coating / Jingcheng Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1325-1334 Titre : Novel partially bio-based fluorinated polyimides from dimer fatty diamine for UV-cured coating Type de document : texte imprimé Auteurs : Jingcheng Liu, Auteur ; Kuan Wang, Auteur ; Yazhen Xie, Auteur ; Fei Gao, Auteur ; Qingtao Zeng, Auteur ; Yan Yuan, Auteur ; Ren Liu, Auteur ; Xiaoya Liu, Auteur Année de publication : 2017 Article en page(s) : p. 1325-1334 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux Fluoropolymères Polyimides Polymères -- Analyse Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : A series of novel partially bio-based fluorinated polyimides with double-bond end groups (BGPIs) from 4,4′-(hexafluoroisopropylidene) diphthalic anhydride, 4,4′-(hexafluoroisopropylidene) dianiline, Priamine 1074, 4-aminobenzoic acid, and glycidyl methacrylate were synthesized via a copolycondensation method in m-cresol. The chemical structure and performances of BGPIs were fully characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, gel permeation chromatography, solubility test, X-ray diffraction, and differential scanning calorimetry. It was determined that the prepared BGPIs were in the amorphous phase and readily soluble in conventional aprotic polar solvents. Additionally, the properties of as-prepared UV-cured coatings based on BGPIs were also evaluated by real-time Fourier transform infrared, thermogravimetric analysis, UV–Vis spectroscopy, and so on. Results revealed that all coatings exhibited satisfactory curing, higher adhesion, lower water uptakes, outstanding optical transparency, and fairly favorable thermal stability under a high content of biomass up to 48.9%. Therefore, these bio-based polymers could be considered as a potential sustainable candidate for high-temperature UV-curable coatings in the microelectronic field. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of BGPIs with double-bond end groups - Preparation of UV-cured coatings based on BGPIs - The characterizations of BGPIs - The characterizations of UV-cured coatings based on BGPIs - RESULTS AND DISCUSSION : Structural characterization of BGPIs - Basic performances of BGPIs - Solubility of BGPIs - XRD analysis of BGPIs - DSC analysis of BGPIs - UV-curing behaviors of the coatings based on BGPIs - Transmittance of UV-cured coatings based on BGPIs - TGA analysis of UV-cured coatings based on BGPIs - Other performances of UV-cured coatings based on BGPIs DOI : 10.1007/s11998-017-9931-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9931-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29637 [article]

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Synthesis and properties of UV-curable cardanol-based acrylate oligomers with cyclotriphosphazene core / Yan Yuan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 1 (01/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 1 (01/2019) . - p. 179-188 Titre : Synthesis and properties of UV-curable cardanol-based acrylate oligomers with cyclotriphosphazene core Type de document : texte imprimé Auteurs : Yan Yuan, Auteur ; Qiaohua Zhou, Auteur ; Ren Liu, Auteur Année de publication : 2019 Article en page(s) : p. 179-188 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux Caractérisation Cardanol Cinétique chimique Composés organiques -- Synthèse Epoxydes Phosphazène Les phosphazènes sont une classe de composés chimiques comportant au moins une double liaison entre un atome de phosphore pentavalent et un atome d'azote, d'où les synonymes d'iminophosphoranes ou d'imides de phosphine. En synthèse organique, le terme phosphazène est souvent utilisé pour désigner une sous-classe de composés dans lesquels l'atome de phosphore est lié à trois autres atomes d'azote. Ces composés sont étonnamment stables et montrent une remarquable basicité, ce qui en fait un des plus remarquables exemples de superbase organique neutre.Les bases phosphazène sont des bases peu nucléophiles plus fortes que les amines ou les amidines couramment utilisées comme la triéthylamine ou le DBU. La protonation n'a pas lieu sur l'atome de phosphore mais sur l'atome d'azote de la liaison iminophosphorane contrairement aux bases de Verkade dont la structure est assez proche. Les phosphazènes sont devenus des réactifs appréciés en chimie organique. L'un des plus connus est le BEMP avec un pKa de l'acide conjugué de 27,6 dans l'acétonitrile et la base de Schwesinger t-Bu-P4 (pKBH+ = 42,7). Les bases phosphazène peuvent également permettre la titration des acides dans les solvants non-aqueux, leurs avantages étant qu'elles restent très fortes dans de nombreux solvants, que leur acide conjugué est inerte et qu'il ne forme pas de liaison hydrogène. Photoréticulation Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermomécaniques Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Multiarm cardanol-based oligomers with a cyclotriphosphazene core were prepared through a nucleophilic substitution reaction; the structures of oligomers were fully characterized and confirmed through Fourier transfer infrared spectrometry, 1H nuclear magnetic resonance (NMR), 31P NMR, and gel permeation chromatography. The designed multiarm bio-based acrylates (AECC) were successfully prepared by epoxidizing the unsaturated aliphatic chain of cardanol segments with m-chloroperoxybenzoic acid and acrylating epoxy groups. The synthesized oligomers contain rigid phosphazene/benzene rings as “hard cores” and long aliphatic chains as “flexible shells.” Compared with commercial hyperbranched polyurethane acrylate (CN2302) and acrylated epoxidized soybean oil, cured AECC coatings and films exhibited not only greater hardness, excellent adhesion, higher glass transition temperatures, and excellent mechanical properties but also good thermal stability and biodegradability. We successfully obtained a high-performance UV-curing resin that has a high biorenewable material content and can meet basic daily requirements. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of cardanol-based multiarm acrylates with a cyclophosphazene core - Synthesis of multiarm cardanol-based cyclophosphazene - Synthesis of epoxidized multiarm cardanol-based resin with a cyclophosphazene core - Synthesis of acrylated epoxidized cardanol-based multiarm resin with a cyclophosphazene core - Preparation of UV-curable formulations and coating - CHARACTERIZATION - RESULTS AND DISCUSSION : Characterization of cardanol-based acrylates - Photopolymerization kinetics - Mechanical properties of UV-cured films - Dynamic thermomechanical properties of UV-cured films - Properties of UV-curable coating - Thermal behavior characterization of UV-cured films - Environmental degradation of AECC cured films - Table 1 : Formulations of UV-curable coatings based on AECC, AESO, and CN2302 - Table 2 : Mechanical properties of UV-cured films - Table 3 : Properties of UV-curable AECC, AESO, and CN2302 coatings - Table 4 : Degradation of weight loss ratio of AECC cured films DOI : 10.1007/s11998-018-0112-1 En ligne : https://link.springer.com/article/10.1007/s11998-018-0112-1 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31983 [article]

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Synthesis of fluorinated polycarbonate-based polyurethane acrylate for UV-curable coatings / Jingcheng Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 1 (01/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 1 (01/2017) . - p. 233–241 Titre : Synthesis of fluorinated polycarbonate-based polyurethane acrylate for UV-curable coatings Type de document : texte imprimé Auteurs : Jingcheng Liu, Auteur ; Baoqing Wang, Auteur ; Yan Yuan, Auteur ; Ren Liu, Auteur ; Zhiquan Li, Auteur ; Xiaoya Liu, Auteur Année de publication : 2017 Article en page(s) : p. 233–241 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère uréthane acrylate Fluoropolymères Hydrophobie Polycarbonates Polymères -- Synthèse Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Fluorinated polycarbonate-based UV-curable polyurethane acrylate (F-PCUA) was synthesized by incorporating 1H, 1H, 2H, 2H-Perfluoro-1-octanol to the end of polycarbonate-based PUA chains. The structure of F-PCUA was determined by 1H-NMR, 19F-NMR, and FTIR analyses. The physical, surface, and thermal properties of F-PCUA were also examined. The F-PCUA was used as a hydrophobic additive in PUA coatings, and the water and oil wettability of the UV-cured film was investigated by contact angle measurements. The results showed that the coating system had great hydrophobicity. Furthermore, X-ray photoelectron spectroscopy research confirmed that a hydrophobic fluorine-enriched surface was obtained in the coating system. Moreover, the mechanical and chemical properties of the hydrophobic coatings did not show deterioration with the introduction of elemental F. Note de contenu : - EXPERIMENTAL : Synthesis of fluorinated PCDL-based PUA (F-CPUA) - Preparation of F-CPUA films - Preparation of hydrophobic PUA Coatings - RESULTS AND DISCUSSION : FTIR - 1H-NMR and 19F-NMR - Tensile strenght - Thermogravimetric analysis (TGA) - Contact angle - Surface-free energy - X-ray photoelectron analysis (XPS) - Coating performance DOI : 10.1007/s11998-016-9847-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9847-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27805 [article]

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