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Improving the fastness properties of thermochromic leathers : the effects of UV absorbent and cross-linkers / Arife Candas Adigüzel Zengin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 5 (09-10/2017)
[article]
Titre : Improving the fastness properties of thermochromic leathers : the effects of UV absorbent and cross-linkers Type de document : texte imprimé Auteurs : Arife Candas Adigüzel Zengin, Auteur ; Eylul Kucukakin, Auteur ; Behzat Oral Bitlisli, Auteur Année de publication : 2017 Article en page(s) : p. 242-249 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants
Absorbeurs de rayonnement ultraviolet
Additifs
Colorimétrie
Photostabilité
Pigments à effets spéciaux
Résistance à l'abrasion
Réticulants
ThermochromieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The emerging new applications of thermochromic pigments in leather industry could give a promising opportunity to create innovative designs of smart thermochromie leathers and these leathers are well known with their colour changing effect depending on thermal activation temperature of the thermochromic pigments. A long product his also needed for thermochromic leathers due to the demand for additive use which will enhance the fastness properties of the microencapsulated thermochromic pigments. This study aimed at increasing the light and rubbing fastness values of the leathers that change colour with temperature. Touch (magenta ; 31°C) and cold (blue; 15°C) activated two thermochromic pigments were used in order to provide the colour change of the finished leathers, UV absorbent and Cross-linking chemical additives were used along. with thermochromic pigments in the finishing procedure to increase the fastness properties of the leathers. Colour change features, rubbing and light fastness properties of thermochromic leathers were analyged by a spectrophotometric method in addition to ISO standards of related fastness properties. The use of a UV absorbent in the finishing procedure lead to an increase in the light fastness values of touch and. cold activated therrnochromic leathers. Likewise it was revealed that the use of cross-linker in the top coat of finishing process.improved the rubbing fastness properties of thermochromic leathers. Note de contenu : - Colour measurements of thermochromic leathers
- Fastness properties of thermochromic leathersEn ligne : https://drive.google.com/file/d/1ZrhUEu363ZeuXd_JhEoD124dYFZdDsOG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29239
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 5 (09-10/2017) . - p. 242-249[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19275 - Périodique Bibliothèque principale Documentaires Disponible Influence of functional group content in hydroxyl-functionalized urethane methacrylate oligomers on the crosslinking features of clearcoats / Young-Gun June in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Influence of functional group content in hydroxyl-functionalized urethane methacrylate oligomers on the crosslinking features of clearcoats Type de document : texte imprimé Auteurs : Young-Gun June, Auteur ; Kevin Injoe Jung, Auteur ; Dong Geun Lee, Auteur ; Subin Jeong, Auteur ; Tae-Hee Lee, Auteur ; Young Il Park, Auteur ; Seung Man Noh, Auteur ; Hyun Wook Jung, Auteur Année de publication : 2021 Article en page(s) : p. 229-237 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Basses températures
Liants
Méthacrylate d'uréthane
Oligomères
Réticulants
Réticulation (polymérisation)
Revêtements organiques
VernisIndex. décimale : 667.9 Revêtements et enduits Résumé : Crosslinking characteristics and surface mechanical properties of radical and urethane dual-curable clearcoats were investigated by changing quantities of C=C bonds and OH groups in hydroxyl-functionalized urethane methacrylate oligomer (HFUMO) resins. The isocyanate blocked with a thermal radical initiator (BL-Tri-cHD) was utilized as a hybrid dual-curable thermal crosslinker to expedite the crosslinking of the main resin. The dual reactions between various HFUMO resins and BL-Tri-cHD were efficiently monitored via Fourier transform infrared spectroscopy to measure the peaks before and after curing. The influence of each functional group (C=C bond or OH group) in HFUMO on the initiation and development of crosslinking in dual-curable clearcoats was investigated by real-time measurements using rotational rheometer and rigid body pendulum tester. Temperature-dependent mechanical properties of cured films were confirmed through dynamic mechanical analysis. The surface mechanical properties of cured clearcoat films were also evaluated via the nanoindentation and nanoscratch tests, demonstrating the variation in surface resistance with respect to the C=C bond content and the OH value. Thus, the low-temperature curing and desired mechanical properties of clearcoats can be optimized by adjusting the content of the functional groups in a HFUMO and using a dual-curable crosslinker to simultaneously generate both radical and urethane crosslinking reactions. Note de contenu : - EXPERIMENTAL METHOS : Synthesis of HFUMOs and blocked isocyanate using a TRI (BL-Tri-cHD) - Formulation of clearcoats with various HFUMO resins - Variations in functional groups by FTIR analysis - Real-time crosslinking behaviors of HFUMO-based clearcoats - Dynamic mechanical analysis of cured films - Surface mechanical properties of cured films
- RESULTS AND DISCUSSION : FTIR analysis of clearcoats with varying quantities of functional groups in HFUMOs - Rheological analysis of crosslinking behavior - Analysis of curing behaviors using RPT - Dynamic mechanical analysis - Indentation depth profiles - Scratch depth profiles
- Table 1 : Formulation of clearcoat mixtures with various HFUMOs with different contents of C=C bond and OH groupDOI : https://doi.org/10.1007/s11998-020-00398-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00398-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35365
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 1 (01/2021) . - p. 229-237[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Influence of novel amine adduct on curing of epoxy resins in presence of vinyl acetate / A. V. Rao in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 842 (03/1995)
[article]
Titre : Influence of novel amine adduct on curing of epoxy resins in presence of vinyl acetate Type de document : texte imprimé Auteurs : A. V. Rao, Auteur ; P. V. Sapre, Auteur Année de publication : 1995 Article en page(s) : p. 41-46 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amines Une amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels.
On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués.
Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3.
Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire.
D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel.
Epoxydes
Haut extrait sec
Matières plastiques
Polyacétate de vinyle
Réticulants
Réticulation (polymérisation)Index. décimale : 667.9 Revêtements et enduits Résumé : To formulate flexible and high-solids coatings, novel amine adduct is synthesized by controlled reaction of diglycidyl ether of ethylene glycol (DGEEG) and m-xylene diamine (MXDA) for curing of epoxy resins in the presence of vinyl acetate (VA). Spontaneous polymerization of vinyl acetate is observed in the presence of amine adduct giving rise to an exotherm. A resinous deep brownish red color is formed in the mixture of vinyl acetate and amine adduct, indicating and interaction which is confirmed by UV spectrophotometry. The interaction is responsible for the spontaneous polymerization of vinyl acetate and a possible mechanism is proposed. The performance of conventional epoxy, viz., diglycidyl ether of bisphenol A (DGEBA) cured with novel amine adduct with and without vinyl acetate is investigated Note de contenu : - EXPERIMENTAL : Materials - Mixing procedure of base and hardener and film application
- EVALUATION OF CURED FILMS OF BISPHENOL A EPOXY AND NOVEL AMINE ADDUCT WITH AND WITHOUT VINYL ACETATEPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18581
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 842 (03/1995) . - p. 41-46[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003500 - Périodique Bibliothèque principale Documentaires Disponible Influence of rubber ratio and crosslinking agent on mechanical properties, crystallization and rheological behaviors of EPDM/PP thermoplastic elastomer / D.-H. Xu in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 4 (08/2019)
[article]
Titre : Influence of rubber ratio and crosslinking agent on mechanical properties, crystallization and rheological behaviors of EPDM/PP thermoplastic elastomer Type de document : texte imprimé Auteurs : D.-H. Xu, Auteur ; Y. Zhou, Auteur ; W.-D. He, Auteur ; H.-M. Wu, Auteur ; J. Yu, Auteur Année de publication : 2019 Article en page(s) : p. 457-466 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique
Analyse thermique
Caoutchouc -- Propriétés mécaniques
Cristallisation
Elastomères thermoplastiques -- Propriétés mécaniques
Ethylène-propylène-diène monomère
Morphologie (matériaux)
Polypropylène
Réticulants
Rhéologie
VulcanisationIndex. décimale : 668.4 Plastiques, vinyles Résumé : The ethylene-propylene-diene monomer/polypropylene (EPDM/PP) thermoplastic elastomer is prepared by dynamic vulcanization. The effects of different rubber ratios and crosslinking agent contents on the static and dynamic mechanical properties, crystallization and rheological behaviors are investigated and discussed. EPDM/PP with the rubber ratio from 40 to 50 % and crosslinking agent content of 1.2 wt% has the highest tensile strength and elongation at break. The fracture morphologies indicate that EPDM/PP with high rubber ratios and crosslinker contents is over vulcanized to harden, which results in that some large particles cannot be fragmented by shear force. The crystallinity obtained from differential scanning calorimetry (DSC) shows a decrease with increasing rubber ratio and a very slight variation with increasing the crosslinking content. The dynamic mechanical analysis (DMA) results display a decrease trend in storage modulus and tan δ with increasing crosslinking density. The rheological behaviors show that the complex viscosity also increases with increasing crosslinking density, indicating that the elastic deformation becomes superior to viscous flow in EPDM/PP. Note de contenu : - EXPERIMENTAL : Materials - Preparation of samples - Measurements and characterization
- RESULTS AND DISCUSSION : Mechanical properties - Morphology analysis - Crystallization behavior - Dynamic mechanical properties - Rheology behaviorDOI : 10.3139/217.3817 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3817/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33064
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 4 (08/2019) . - p. 457-466[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21083 - Périodique Bibliothèque principale Documentaires Disponible Interaction of aldehyde developed from amino acids of tannerry waste in a lower-vegetable tannage an eco-friendly approach - Part 2 / James Kanagaraj in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 6 (11-12/2005)
[article]
Titre : Interaction of aldehyde developed from amino acids of tannerry waste in a lower-vegetable tannage an eco-friendly approach - Part 2 Type de document : texte imprimé Auteurs : James Kanagaraj, Auteur ; S. Sadulla, Auteur ; G. S. Raja Kumar, Auteur ; N. K. Chandrababu, Auteur Année de publication : 2005 Article en page(s) : p. 250-256 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acacia et constituants
AldéhydesUn aldéhyde est un composé organique, faisant partie de la famille des composés carbonylés, dont l'un des atomes de carbone primaire (relié au plus à 1 atome de carbone) de la chaîne carbonée porte un groupement carbonyle.
L'aldéhyde le plus simple est le formaldéhyde (ou méthanal), aussi appelé formol lorsqu'il est en solution aqueuse.
Un aldéhyde dérive formellement d'un alcool primaire (oxydation) dont le groupement hydroxyde -OH est en bout de chaîne et se forme suite à l'enlèvement de deux atomes H d'où le nom "alcool déshydrogéné" ou aldéhyde.
Caractérisation
Chimie analytique
Colorimétrie
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuirs et peaux -- Propriétés physiques
Eaux usées -- Analyse
Liqueurs de tannage
Réticulants
Tannage organique
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Fleshings obtained from the liming process were hydrolysed with a proteolytic enzyme and further broken down to the amino acid level before being used to prepare the corresponding aldehyde, which was used as a crosslinking agent.
In the present study the cross-linking agent developed was used to tan the delimed pelt. Subsequently, the leather obtained was tanned with wattle extract at various levels and the combination effect was studied. The tanning studies carried out using the cross-linking agent were discussed in detail in Part I of the paper. Details of the application of the cross-linker aldehyde and its results on pelts as well as with chrome tannage are described in Part 1 of this paper. (J. Soc. Leather Technol. Chem., 2005, 89 (1), 18.) The combination tanning studies with wattle extract at various levels are discussed in this part.Note de contenu : - Materials
- Methods
- Characterisation of cross-linking agent
- Tanning studies
- Table 1 : Characteristics of spent liquor and leather
- Table 2 : Shrinkage temperature and DSC data for the leather
- Table 3 : 1HNMR and FT-IR data
- Table 4 : Total Dissolved Solids (TDS) in various tanning effluent
- Table 5 : Colour measurements
- Table 6 : Colour difference value computed for various experiments when CA treated leather is taken as control
- Table 7 : Physical characteristics of crust leatherEn ligne : https://drive.google.com/file/d/1_VlY4UH2svTJ-6oGkxb3OFRWPiBoul2C/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39215
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 6 (11-12/2005) . - p. 250-256[article]Interaction of aldehyde developed from amino acids of tannery waste in a lower - chrome tannage an eco-friendly approach / James Kanagaraj in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 1 (01-02/2005)
PermalinkInvestigation of UV-curable alkyd coating properties / Qianhe Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)
PermalinkPermalinkIs your waterborne 2K epoxy formulation giving you a headache ? Here is the cure ! / Michaela Zirngast in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4609 (06/2015)
PermalinkIsocyanate-free Michael addition cured aliphatic topcoats / M. Gessner in COATINGS TECH, Vol. 14, N° 8 (08/2017)
PermalinkPermalinkA kinetic study of the reaction of epoxidized rubber and carboxylic acids / J. Kyle Copeland in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 833 (06/1994)
PermalinkLiquid polysulfide polymers for chemical- and solvent-resistant sealants / Volker burkhardt in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 25, N° 8 (08/2018)
PermalinkLow and no-VOC architectural coatings containing ambient curing functional groups / Zhiyu Wang in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 852 (01/1996)
PermalinkLow bake technologies / Priscilla Lips in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 203, N° 4589 (10/2013)
PermalinkLow viscosity hardeners gives superior aesthetics even at high application temperatures / Sachin Kamble in PAINTINDIA, Vol. LXXI, N° 2 (02/2021)
PermalinkLow-viscosity, high-functionality crosslinker / Christoph Irle in EUROPEAN COATINGS JOURNAL (ECJ), N° 11 (11/2015)
PermalinkLow-VOC high-performance waterborne epoxy systems in protective coating application / Yong Zhang in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 1 (01/2017)
PermalinkPermalinkMechanical and tribological properties of snake grass fibers reinforced epoxy composites : effect of Java plum seed filler weight fraction / Natarajan Ponnusamy in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 5 (2023)
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