Development of functionalized SiO2–TiO2 reinforced cardanol and caprolactam modified diamine based polybenzoxazine nanocomposites for high performance applications in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1737-1749 Titre : Development of functionalized SiO2–TiO2 reinforced cardanol and caprolactam modified diamine based polybenzoxazine nanocomposites for high performance applications Type de document : texte imprimé Année de publication : 2019 Article en page(s) : p. 1737-1749 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Benzoxazine Cardanol Composés inorganiques -- Synthèse Composés organiques -- Synthèse Dioxyde de silicium Dioxyde de titane Matériaux -- Propriétés fonctionnelles Métaux -- Revêtements protecteurs Polybenzoxazine Revêtements -- Analyse Revêtements -- Propriétés thermomécaniques Revêtements organiques Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : In the present work, three types of polybenzoxazines were synthesized using caprolactam-based diamine (CPA-NH2) and formaldehyde with different phenols, namely 4-fluorophenol, cardanol, and phenol, under appropriate experimental conditions. The molecular structure of the benzoxazine monomers was confirmed by FTIR, 1H, and 13C NMR spectroscopic techniques. Polybenzoxazines were obtained through ring-opening polymerization of benzoxazine monomers, and their formation was confirmed by FTIR spectroscopy. The elemental composition and morphological behavior of polybenzoxazines were characterized by SEM-EDAX and AFM techniques. The naturally occurring cardanol- and caprolactam-based diamine (CPA-NH2)-based benzoxazine was selected for detailed studies. The synthesized SiO2–TiO2 nanohybrid reinforcement was functionalized with 3-aminopropyltrimethoxysilane (3-APS) and reinforced with cardanol-based benzoxazine (CPBz) monomer. The resulted nanocomposites were studied for their corrosion protection behavior against mild steel surface along with thermomechanical (TGA and DMA) and morphological (SEM, XRD, and TEM) properties. The results obtained from electrochemical impedance analysis indicate that the 5 wt% of F–SiO2–TiO2 of reinforced CPBz exhibits an effective corrosion-resistant behavior toward surface of steel specimen than that of other samples. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of caprolactam diamine (CPA-NH2) - Synthesis of phenol-based benzoxazine (PBz) - Synthesis of 4-fluorophenol-based benzoxazine (FPBz) - Synthesis of cardanol-based benzoxazine (CPBz) - Synthesis of SiO2 nanosilica - Preparation of SiO2-TiO2 and functionalized SiO2-TiO2 nanoparticles - Preparation of neat CPBz and F-SiO2-TiO2- reinforced CPBZ nanocomposites - Surface preparation of the mild steel specimens - Preparation of neat CPBz and F-SiO2-TiO2 - RESULTS AND DISCUSSION : FTIR analysis - NMR analysis - XRD analysis - Thermal properties - Dynamic mechanical analysis (DMA) - Morphological studies DOI : 10.1007/s11998-019-00263-w En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00263-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33427 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21321	-	Périodique	Bibliothèque principale	Documentaires	Disponible

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]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 2 (03/2020) . - p. 333-343 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, Procédé Index. 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 films DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33985 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21658	-	Périodique	Bibliothèque principale	Documentaires	Disponible

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]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20659	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)