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Catalyzed crosslinking of highly functional biobased epoxy resins / Thomas J. Nelson in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 5 (09/2013)
[article]
Titre : Catalyzed crosslinking of highly functional biobased epoxy resins Type de document : texte imprimé Auteurs : Thomas J. Nelson, Auteur ; Teluka P. Galhenage, Auteur ; Dean C. Webster, Auteur Année de publication : 2013 Article en page(s) : p. 589-600 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique
Analyse thermique
Biomatériaux
Biopolymères
Bisphénol A
Catalyse
Epoxydes
Esters
Matériaux -- Propriétés fonctionnelles
Réticulation (polymérisation)
Saccharose
Soja et constituants
Thermogravimétrie
Transition vitreuseIndex. décimale : 668.9 Polymères Résumé : Crosslinking reactions involving epoxy homopolymerization of 100% biobased epoxidized sucrose esters (ESEs) were studied and the resulting coatings properties were compared against epoxidized soybean oil (ESO) and petrochemical-based soybean fatty acid ester resins. The low viscosity of ESE resins allowed for formulations to be developed with minimal volatile organic content. ESEs were found to have superior coatings properties, compared to ESO and the petrochemical-based soybean esters, attributable to a higher glass transition temperature (T g) and a higher modulus. The rigid sucrose core on ESEs provided an increase in coating performance when compared to coatings from epoxidized resins synthesized with tripentaeryithritol as a core. The degree of conversion and optimization of the curing conditions were studied using differential scanning calorimetry (DSC). Thermal analysis of cured coatings was performed using DSC, dynamic mechanical analysis, and thermogravimetric analysis. In order to further enhance the coatings properties, small amounts of bisphenol A epoxy resin were added which resulted in higher moduli and Tgs. Note de contenu : - EXPERIMENTAL : Materials - Epoxidation reactions - MALDI analysis - Coating formulations - Thermal analysis - Coatings tests - Soxhlet extraction
- RESULTS AND DISCUSSION : MALDI analysis - Catalyst study - Curing study - Coatings properties - Addition of BPA epoxy resinDOI : 10.1007/s11998-013-9488-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9488-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19778
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 5 (09/2013) . - p. 589-600[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15618 - Périodique Bibliothèque principale Documentaires Disponible 15679 - Périodique Bibliothèque principale Documentaires Disponible Changes in hydrothermal stability of collagen with several catechin-metal compounds : A DSC study / Chen Hui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 3 (05-06/2008)
[article]
Titre : Changes in hydrothermal stability of collagen with several catechin-metal compounds : A DSC study Type de document : texte imprimé Auteurs : Chen Hui, Auteur ; Shan Zhi-Hua, Auteur Année de publication : 2008 Article en page(s) : p. 93-95 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
CatéchineLa catéchine est une molécule de la famille des flavonoïdes de la sous-classe des flavanols. Elle est aussi connue sous le nom de catéchol, avec le risque de confusion avec le pyrocatéchol parfois dénommé lui aussi catéchol. L’usage dans la communauté scientifique a fini par imposer le terme de catéchine, dérivé du terme anglais catechin.
Initialement découverte dans les fruits de l'acacia à cachou (Acacia catechu) duquel elle dérive son nom, la catéchine et ses nombreux isomères sont de puissants antioxydants qui aident à prévenir les maladies inflammatoires et coronariennes.
Le terme de catéchine est aussi parfois utilisé pour désigner la classe des flavanols (flavan-3-ols, flavan-3,4-ols et leurs esters galliques). Pour éviter la confusion entre la classe et le composé, ce dernier est désigné dans ce contexte par (+/-)-catéchine.
Collagène
Ions métalliques
Stabilité hydrothermaleIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Differential scanning calorimetry (DSC) is a very useful tool to research the hydrothermal stability of collagen which has also been defined in the leather industry as denaturation temperature (Td). It has been widely used to describe the tanning power of materials, according to changes of Td. In this paper, changes in hydrothermal stability of collagen with several catechin-metal compounds were described using DSC curves. The Td results lead us to conclude that the hydrothermal stability of collagen can be improved by compounds formed with catechin and metal ions (Cr(III), Al(III) and Cu(II)).The more stable the compound, the higher the Td of collagen tanned with the compound ie.the stronger the tanning power of the compound and the higher the hydrothermal stability of collagen. En ligne : https://drive.google.com/file/d/1Tcwx3w0sW7caBzzr2bgT6rrxXAgeVG6N/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38952
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 3 (05-06/2008) . - p. 93-95[article]Characterisation and application of polyurethane copolymers grafted with photoluminescent dyes / Yong Chan Chung in COLORATION TECHNOLOGY, Vol. 130, N° 4 (08/2014)
[article]
Titre : Characterisation and application of polyurethane copolymers grafted with photoluminescent dyes Type de document : texte imprimé Auteurs : Yong Chan Chung, Auteur ; Kiseok Yang, Auteur ; Jae Won Choi, Auteur ; Byoung Chul Chun, Auteur Année de publication : 2014 Article en page(s) : p. 305-313 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Caractérisation
Colorants
Copolymères -- Propriétés mécaniques
Copolymères -- Synthèse
Copolymères greffés
Effet mémoire de forme
Electrofilature
Essais (technologie)
Essais dynamiques
Photoluminescence
Polyuréthanes
Traction (mécanique)Index. décimale : 667.9 Revêtements et enduits Résumé : Photoluminescent dyes (aminofluorene, naphthalimide, naphtholbenzein, or phenosafranine) were grafted to polyurethane using an allophanate linkage. The photoluminescence properties and the shape recovery effects of polyurethane samples were investigated. The polyurethane was composed of 4,4?-methylenebis(phenylisocyanate), poly(tetramethyleneglycol), and 1,4-butanediol. The dyes were linked through an extra 4,4?-methylenebis(phenylisocyanate) and the carbamate moiety of the polyurethane chains. Polyurethanes with various dye contents were characterised, and the shape recovery and photoluminescence properties were compared. In the case of the tensile mechanical properties, the highest maximum stress was 56 MPa, and the strain remained > 1500% for the entire series. The shape recovery improved as the test cycle was repeated, with up to 100% recovery being achieved, but shape retention decreased as the dye content increased. Finally, the photoluminescence of the polyurethanes was demonstrated by a luminescent light-emission test, together with pH indication capability and the preparation of non-woven fibre using the electrospinning method. Note de contenu : - EXPERIMENTAL : Materials - Polymer synthesis - Crosslink density - Electrospinning - Characterisation - Shape-memory test
- RESULTS AND DISCUSSION : Synthesis and structure of PU - IR and thermal analysis - Crosslink density and viscosity - Tensile mechanical properties - Shape-memory effect - Luminescence of PU - ElectrospinningDOI : 10.1111/cote.12097 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12097 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21783
in COLORATION TECHNOLOGY > Vol. 130, N° 4 (08/2014) . - p. 305-313[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16443 - Périodique Bibliothèque principale Documentaires Disponible Characteristics of urushi film prepared through thermal polymerization / Chieko Narita in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)
[article]
Titre : Characteristics of urushi film prepared through thermal polymerization Type de document : texte imprimé Auteurs : Chieko Narita, Auteur ; Yoko Okahisa, Auteur ; Saori Kitaguchi, Auteur ; Kazushi Yamada, Auteur Année de publication : 2023 Article en page(s) : p. 1299-1310 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Analyse thermique
Angle de contact
Biopolymères
Colorimétrie
Laque et laquage
Laque japonaise
Mesure
Microscopie électronique à balayage
Polymérisation thermique
Revêtements -- Propriétés mécaniques
RugositéIndex. décimale : 667.9 Revêtements et enduits Résumé : Urushi (oriental lacquer) is a natural material that forms thin films with excellent durability and water resistance. There are two methods for curing urushi: oxidative and thermal polymerizations. Urushi is mainly applied to wood; therefore, the oxidative polymerization method has mainly been used to cure it. Oxidative polymerization requires temperature and humidity control and takes a long time to fully cure urushi. Urushi mixed with pigments has poor coloration. In contrast, the use of a thermal polymerization reaction can achieve curing in a short time. In this study, we focused on the thermal curing reaction of urushi, formed 13 different colored urushi coating films, and investigated their properties and coloration. We observed that urushi coatings produced through thermal polymerization took less time to cure than those produced through oxidative polymerization, and that urushi coatings with better coloration and high water repellency were obtained. Note de contenu : - EXPERIMENTAL :
- Materials and preparation of samples
- Measurement methods
- RESULTS AND DISCUSSION :
- FTIR spectroscopy
- DSC
- Color measurements
- UV–visible spectroscopy
- SEM observation
- Surface roughness and contact angle
- Mechanical properties
- Table 1 Correspondence table between pigments and sample name
- Table 2 L*, a*, b*, and C* values of all samples measured using SCI and SCE modes
- Table 3 Surface roughness of the samples G, K, and M obtained via laser microscopyDOI : https://doi.org/10.1007/s11998-022-00745-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00745-4.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39717
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Code-barres Cote Support Localisation Section Disponibilité 24153 - Périodique Bibliothèque principale Documentaires Disponible Characterization and properties of gradient polyacrylate latex particles by gradient emulsion polymerization / Xinya Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 6 (11/2012)
[article]
Titre : Characterization and properties of gradient polyacrylate latex particles by gradient emulsion polymerization Type de document : texte imprimé Auteurs : Xinya Zhang, Auteur ; Xia Wei, Auteur ; Wenxing Yang, Auteur ; Yongjin Li, Auteur ; Huanqin Chen, Auteur Année de publication : 2012 Article en page(s) : p. 765-774 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylate de butyle
Analyse thermique
Caractérisation
Chromatographie sur gel
Copolymérisation
Latex
Méthacrylate de méthyle
Microscopie à force atomique
Microscopie électronique en transmission
Particules (matières)
Polyacrylates
Polymérisation en émulsion
Résonance magnétique nucléaireIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, gradient acrylate latex particles were synthesized by gradient copolymerization. n-Butyl acrylate (BA) and methyl methacrylate (MMA) were used as co-monomers, dodecyl diphenyl ether sodium disulfonate as the emulsifier, and potassium persulfate as the initiator. The technique involved the continuous addition of one monomer mixture into a stirred tank containing another monomer mixture. Their microstructure and properties were analyzed by nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), atomic force microscopy (AFM), transmission electron microscopy (TEM), and particle size analysis. 1H-NMR spectra show a gradual change in the chemical composition with the growth of molecular chains. The gradient polymer latexes, the instantaneous copolymer composition of which varies as the polymerization proceeds, are obtained. GPC analyses show that the aggregated molecular chain in the BA-centered latex particle experiences a process from dominant BA to MMA with changes in the monomer's feed composition during the polymerization. Particle size and TEM analyses show that the increasing latex size agrees well with the gradient growth pattern. DSC analyses show that the gradient latex particles exhibit only one broadened and ambiguous glass transition region. AFM analyses indicate no obvious microphase segregation occurs in the gradient latex particles, further verifying that the gradient microstructure is obtained. Note de contenu : - EXPERIMENTAL DETAILS : Materials - Gradient emulsion polymerization - Testing and characterization
- RESULTS AND DISCUSSION : H-NMR analyses - GPC analyses - Particle size analyses - DSC and MFT analyses - AFM analysesDOI : 10.1007/s11998-012-9422-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9422-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16662
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