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Synthesis and properties of polyurethane acrylate modified by different contents of stearyl alcohol / Lili Qin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 1 (01/2015)
[article]
Titre : Synthesis and properties of polyurethane acrylate modified by different contents of stearyl alcohol Type de document : texte imprimé Auteurs : Lili Qin, Auteur ; Jun Nie, Auteur ; Yong He, Auteur Année de publication : 2015 Article en page(s) : p. 197-204 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Alcool stéarylique
Analyse thermomécanique dynamique
Chlorure de polyvinyle
Copolymère uréthane acrylate
Copolymères -- Propriétés mécaniques
Oligomères
Photoréticulation
Polycarbonates
Retrait volumique
VerreIndex. décimale : 667.9 Revêtements et enduits Résumé : Polyurethane acrylates (PUAs) modified by different amounts of stearyl alcohol were synthesized from stearyl alcohol (SA), isophorone diisocyanate, 2-hydroxyethyl acrylate, and polycaprolactone triol. The molecular structure was characterized by Fourier transform infrared spectroscopy. Real time infrared spectroscopy was used to investigate the kinetics of photopolymerization of synthesized PUAs. The volume shrinkage was measured by laser displacement sensor. The adhesion on glass, polycarbonate (PC), and polyvinyl chloride (PVC) was tested by the laser micrometer and universal testing machine. The glass transition temperature (T g) and storage modulus (E′) were measured by dynamic mechanical analyzer (DMA). The pendulum hardness, pencil hardness and flexibility were also measured. The results showed that the greater the amount of SA in synthesized PUAs, the lower the volume shrinkage and the better the adhesion to glass, PC, and PVC substrates. Note de contenu : - EXPERIMENTAL : Materials - Instrumentation - Synthesis process of polyurethane acrylate (PUA) - Sample preparation
- RESULTS AND DISCUSSION : Characterization of PUA - Photopolymerization kinetics of synthesized oligomer - Volume shrinkage - Dynamic mechanical thermal properties - Mechanical propertiesDOI : 10.1007/s11998-014-9625-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9625-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23218
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 1 (01/2015) . - p. 197-204[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16952 - Périodique Bibliothèque principale Documentaires Disponible The electrodeposition of polypyrrole on Al alloy from room temperature ionic liquids / Jun Nie in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 3 (09/2008)
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Titre : The electrodeposition of polypyrrole on Al alloy from room temperature ionic liquids Type de document : texte imprimé Auteurs : Jun Nie, Auteur ; Gordon P. Bierwagen, Auteur ; Dennis E. Tallman, Auteur Année de publication : 2008 Article en page(s) : p. 327-334 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages
Dépôt électrolytique
Liquides ioniques
PolypyrrolesIndex. décimale : 667.9 Revêtements et enduits Résumé : The direct electrodeposition of conjugated polymers onto active metals such as aluminum and its alloys is complicated by the concomitant oxidation of the metal that occurs at the positive potential required for polymer formation/deposition. We previously described an approach that uses electron transfer mediation to reduce the deposition potential of polypyrrole (PPy) on aluminum and aluminum alloy by nearly 500 mV, permitting film deposition from aqueous solution with nearly 100% current efficiency. In this report, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (EMIM+TFSI-) has been successfully employed both as the growth medium and the supporting electrolyte for directly depositing uniform and conductive PPy coatings onto Al alloy 2024-T3 surface via a potentiodynamic technique. The depositions of PPy were carried out under cyclic voltammetric conditions from 0.3 M pyrrole in ionic liquid solutions. Film morphology was characterized by atomic force microscopy, optical microscopy, and scanning electron microscopy (SEM). Energy dispersive X-ray analysis and X-ray photoelectron spectroscopy verified that the TFSI- anion was incorporated into the polymer as the dopant ion. Thickness of the film was measured by SEM and film conductivity was determined by both a four-point probe technique and by conducting atomic force microscopy. Electrochemical activity of the film was assessed by cyclic voltammetry. Results from these preliminary studies will be reported. DOI : 10.1007/s11998-008-9084-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9084-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2976
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 3 (09/2008) . - p. 327-334[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010633 - Périodique Bibliothèque principale Documentaires Disponible UV-cured organic–inorganic hybrid moisture barrier materials based on polybutadiene dimethacrylate / Sahohui Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)
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Titre : UV-cured organic–inorganic hybrid moisture barrier materials based on polybutadiene dimethacrylate Type de document : texte imprimé Auteurs : Sahohui Liu, Auteur ; Ya Wu, Auteur ; Jun Nie, Auteur ; Yong He, Auteur Année de publication : 2019 Article en page(s) : p. 429-437 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ammoniums quaternaires
Caractérisation
Montmorillonite
Photoréticulation
Résistance à l'humidité
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements protecteurs
SodiumLe sodium est un élément chimique, de symbole Na et de numéro atomique 11. C'est un métal mou et argenté, qui appartient aux métaux alcalins. On ne le trouve pas à l'état de corps pur dans la nature, mais il est très abondant sous forme de composés, par exemple dans le sel. Il brûle avec une flamme jaune.
Le sodium possède 22 isotopes connus, avec un nombre de masse variant entre 18 et 37.Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, a synthesized polymerizable quaternary ammonium salt (PQAS-18) was intercalated into inorganic sodium montmorillonite (Na-MMT) as an organic modifier via cationic exchange. Afterward, a novel organic–inorganic hybrid material was prepared through in situ UV-curing technology and combined with a polymer matrix based on polybutadiene dimethacrylate (PBDMA). PQAS-18 fixed the crosslinked network due to its double bond, thereby leading to firm bonding between the polymer matrix and organoclay; moreover, our study showed homogeneous dispersion of the lamellar structure in the polymer matrix. X-ray diffraction proved that the distance between Na-MMT layers increased, and water vapor transmission measurement showed that the moisture barrier property of cured hybrid film was remarkably improved. Note de contenu : - Materials
- Preparation of organoclay
- Preparation of the organic-inorganic hybrid films
- CharacterizationDOI : 10.1007/s11998-018-0121-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0121-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32414
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Code-barres Cote Support Localisation Section Disponibilité 20894 - Périodique Bibliothèque principale Documentaires Disponible Volume shrinkage of UV-curable coating formulation investigated by real-ime laser reflection method / Yu Jian in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 2 (03/2013)
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Titre : Volume shrinkage of UV-curable coating formulation investigated by real-ime laser reflection method Type de document : texte imprimé Auteurs : Yu Jian, Auteur ; Yong He, Auteur ; Tongzhou Jiang, Auteur ; Chunguang Li, Auteur ; Wantai Yang, Auteur ; Jun Nie, Auteur Année de publication : 2013 Article en page(s) : p. 231-237 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Réticulation (polymérisation)
Retrait volumique
Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : Volume shrinkage is one of the main drawbacks of UV-cured coatings and can lead to premature coating failures. Due to the rapid polymerization during UV-curing, real-time volume shrinkage has been challenging to measure accurately. In this article, the shrinkage process of UV-curable formulations was systematically investigated by a recently developed laser reflection method. The influence of oligomers, monomers, and photoinitiators on shrinkage process has been evaluated. Compared with the oligomers, the monomer was the main contributor to shrinkage due to the high concentration of double bonds. Polymerization shrinkage could be reduced by increasing the oligomer/monomer ratio. Because monomers were the main contributors of shrinkage, the chemical structure of monomers was important for decreasing shrinkage. Methacrylate monomers decreased the final shrinkage but unfortunately reduced the conversion. Monomers with a high degree of ethoxylation lowered the shrinkage and simultaneously increased the conversion. The concentration of photoinitiators had no obvious effect on the normalized shrinkage. Thus, the low shrinkage caused by the low concentration of photoinitiators was only attributed to the significant drop of the conversion. Note de contenu : - EXPERIMENTAL PART : Materials - Shrinkage measurement - Conversion measurements
- RESULTS AND DISCUSSION : The effect of the oligomer content on shrinkage - The effect of the monomer structure on shrinkage - The effect of photoinitiator on shrinkageDOI : 10.1007/s11998-012-9446-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9446-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18247
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Code-barres Cote Support Localisation Section Disponibilité 14920 - Périodique Bibliothèque principale Documentaires Disponible 15125 - Périodique Bibliothèque principale Documentaires Disponible 15592 - Périodique Bibliothèque principale Documentaires Disponible