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Thermodynamics of deformation of latex blend coatings and its implications for tailoring their properties / N. Agarwal in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 896 (09/1999)
[article]
Titre : Thermodynamics of deformation of latex blend coatings and its implications for tailoring their properties Type de document : texte imprimé Auteurs : N. Agarwal, Auteur ; R. J. Farris, Auteur Année de publication : 1999 Article en page(s) : p. 61-72 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calorimétrie
Couches minces
Déformations (mécanique)
Essais dynamiques
Latex
Mélanges (chimie)
Polyacryliques
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements en phase aqueuse:Peinture en phase aqueuse
Thermodynamique
Traction (mécanique)Index. décimale : 667.9 Revêtements et enduits Résumé : Acrylic-based latex blend coatings, comprising a hard (Tg=45°C) and soft (Tg= -5°C) phases are evaluated in terms of the total energy they absorb before failure in a tensile test. Simultaneous measurement of the work and heat of deformation using a novel technique of differential gas pressure stretch calorimetry enables an estimate of change in their internal energy by application of the first law of thermodynamics. As the hard phase content of the blend is increased from 0-100%, its stiffness and tenacity increase, while the toughness (i.e., the energy to failure) undergoes a maximum at an intermediate composition. A partitioning of the mechanical work into heat and internal energy over the complete range of blend composition highlights the result that a simultaneous maximization of the heat dissipation and energy absorption is necessary to maximize blend toughness. This provides a new framework in which the properties of blend systems can be tailored in terms of their stiffness and toughness to design improved coatings. Note de contenu : - BACKGROUND : A brief historical perspective - Theory of operation - Calorimeter schematic - Calibrations
- EXPERIMENTAL : Materials and sample preparation - Techniques
- RESULTS AND DISCUSSION : Thermo-mechanical characterization - Stretch-calorimetryPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17928
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 896 (09/1999) . - p. 61-72[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003564 - Périodique Bibliothèque principale Documentaires Disponible Towards new performance criteria for exterior wood coatings / Laurence Podgorski in EUROPEAN COATINGS JOURNAL (ECJ), (04/2023)
[article]
Titre : Towards new performance criteria for exterior wood coatings : The study of mechanical properties and gloss retention is essential for developing crack-resistant coatings Type de document : texte imprimé Auteurs : Laurence Podgorski, Auteur Année de publication : 2023 Article en page(s) : p. 72-77 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Applications extérieures
Bois extérieurs
Résistance à la fissuration
Résistance aux conditions climatiques
Revêtements -- Propriétés mécaniquesIndex. décimale : 667.9 Revêtements et enduits Résumé : The performance criteria for exterior wood coatings are mainly based on visual and thus subjective assessments of degradation, of which cracking is the first visible sign. It clearly indicates that the coating is not flexible enough to resist dimensional variations of wood but does not explain the cracking risk. First presented at the International Woodcoatings Congress, this paper discusses the merits of Persoz hardness, variations in tensile properties, gloss retention as useful and measurable performance criteria. Note de contenu : - High initial persoz, high risk of cracking
- Strain at break retention
- And low tensile modulus variation are key for cracking resistnace
- Gloss retention : a candidate performance indicator ?
- Table 1 : Information about the coating systemsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39048
in EUROPEAN COATINGS JOURNAL (ECJ) > (04/2023) . - p. 72-77[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23937 - Périodique Bibliothèque principale Documentaires Disponible Transparent polyester polyol-based polyurethane coatings : the effect of alcohols / Junrui Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 6 (11/2013)
[article]
Titre : Transparent polyester polyol-based polyurethane coatings : the effect of alcohols Type de document : texte imprimé Auteurs : Junrui Zhang, Auteur ; Weiping Tu, Auteur ; Zilin Dai, Auteur Année de publication : 2013 Article en page(s) : p. 887-895 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique
Polyesters
Polyols
Polyuréthanes
Résistance à l'humidité
Résistance chimique
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements -- Propriétés optiques:Peinture -- Propriétés optiques
Revêtements:Peinture
Stabilité thermique
Transparence (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : A series of polyester polyols were synthesized using 1,6-hexanediol (HDO), 1,4-cyclohexanedimethanol (1,4-CHDM) and trimethylol propane (TMP), alone or in combination with 1,4-cyclohexanedicarboxylic acid and adipic acid. The polyester polyols were reacted with isocyanate trimers to form polyurethane (PU) coatings. Physical properties of the polyesters such as hydroxyl value, acid value, molecular weight, viscosity, and glass transition temperature (T g) had been determined, and the IR spectroscopic analyses of polyesters/PU were reported. The properties (impact resistance, film flexibility, hardness, optical transmittance, chemical resistance, water absorption, thermostability, and phase separation) of the PU coatings so prepared were characterized. The viscosities of polyester polyols were dependent on the structure of the alcohols. Polyester polyol containing only linear aliphatic diol (HDO) was a transparent liquid at room temperature. The viscosity was increased by raising the molar ratio of 1,4-CHDM and/or TMP. All PU coatings had excellent flexibility, impact resistance, and hardness. The coatings derived from diol CHDM had the highest hardness, and the PU derived from diol HDO had the lowest hardness. The chemical resistance and water absorption improved with greater molar ratios of 1,4-CHDM or TMP. Results of differential scanning calorimetry and wide-angle X-ray diffraction indicated that there was no obvious crystallinity in the PU networks. Dynamic mechanical analysis (DMA) results revealed that both CHDM and TMP can increase the T g of PU, and the crosslinking density improved with increased molar ratio of TMP. Atomic force microscope (AFM) and DMA analysis revealed that the PU coatings had no obvious microphase separation, which enabled them to have excellent properties, and the different composition in polyols did not have significant influence on transmittance in the visible region. Results of thermogravimetric measurements indicated that all the PU coatings had good thermal stability. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of polyester polyols - Preparation of PU coatings - Testing methods
- RESULTS AND DISCUSSION : Preparation and polymeric properties of polyester polyols - Characterization of polyester polyols and PU coatings - Mechanical properties of PU based on different polyester polyols - Transmittance - DMA analysis - Thermal stability - Chemical and water resistance of PU coatings - Surface morphology of transparent PU coatingsDOI : htt10.1007/s11998-013-9527-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9527-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19828
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Code-barres Cote Support Localisation Section Disponibilité 15744 - Périodique Bibliothèque principale Documentaires Disponible Tribology & tribochemistry for innovations in organic coatings / Milton A. Glaser in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 842 (03/1995)
[article]
Titre : Tribology & tribochemistry for innovations in organic coatings Type de document : texte imprimé Auteurs : Milton A. Glaser, Auteur Année de publication : 1995 Article en page(s) : p. 47-48 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces
Frottements (mécanique)
Lubrifiants
Lubrification
Revêtements
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Tribologie (technologie)
Usure (mécanique)Index. décimale : 667.9 Revêtements et enduits Résumé : For many coatings technologists today, tribology is just a word-and one with a vague meaning at that! It is the avowed purpose of this short paper to: Alert polymeric coatings technologists of the potential importance of tribology and tribochemistry to their innovative R&D work; and stimulate the study, by these coatings technologists, of the tribological and tribochemical factors applicable to the design, preparation, and uses of organic coatings. Note de contenu : - Lubricants and lubrication
_ Possible applications of tribology to coatings technologyPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18582
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Code-barres Cote Support Localisation Section Disponibilité 003500 - Périodique Bibliothèque principale Documentaires Disponible A tunable controlled-release urea fertilizer coated with a biodegradable polyurethane-nanoclay composite layer / Kannika Sitthisuwannakul in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)
[article]
Titre : A tunable controlled-release urea fertilizer coated with a biodegradable polyurethane-nanoclay composite layer Type de document : texte imprimé Auteurs : Kannika Sitthisuwannakul, Auteur ; Kanittha Kamonchaivanich, Auteur ; Thanakorn Wirunmongkol, Auteur ; Pennapa Muthitamongkol, Auteur ; Wiyong Kangwansupamonkon, Auteur Année de publication : 2023 Article en page(s) : p. 635-646 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Argile
Biodégradation
Caractérisation
Coefficient de diffusionUn coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick.
Engrais organiques
Nanoparticules
Polyuréthanes
Revêtements -- Propriétés chimiques
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés physiques
Revêtements organiques
Système de libération contrôlée (technologie)
UréeIndex. décimale : 667.9 Revêtements et enduits Résumé : To minimize a loss of urea to the environment and also control a release activity, a tunable and controlled-release urea fertilizer (TCRF) was created. Composite coating layers of the TCRF were synthesized using a composite of nanoclay (B27), and a linseed oil-modified polyurethane resin (BURNOCK® UL65). The concentration of B27 nanoclay was varied from 0, 3, 5 and 10 wt% and called TCRF, TCRF-3, TCRF-5 and TCRF-10, respectively. Firstly, nanocomposite free-standing films (NFs) with 0, 0.5, 1, 3, 5 and 10 wt% of B27 were synthesized and tested to demonstrate the mechanical properties of the coating layer. When the B27 clay content increased, the Young’s modulus and yield strength were increased. On the other hand, the elongation at break was decreased. NFs were also characterized by XRD and TEM, which showed a partial exfoliated nanocomposite character. The water contact angle measurement showed that all NFs had hydrophobicity properties (87°–90° contact angle). Moreover, the microorganism degradability test showed that the NFs degraded at 37 ± 2°C and 58 ± 2°C in manure, a common agriculture media. The study on coated urea fertilizers found that the thickness of all TCRFs layers is around 52–54 μm. The nitrogen release profiles of the TCRF at 60°C in water as a predictive analytic model were investigated using an elemental analyzer that is a pathway analysis method to understand the release profiles of the TCRFs. All release profiles fitted well with the sigmoidal model, which was suitable for a common plant growth. The profiles gave diffusion coefficients (D) in the range of 49–69 μm2 h−1 and presented an inverse trend to the yield strength of the NFs. The investigation demonstrated that B27 played an important role in tuning the strength of the coating layers that affected the urea release to the plants and the environment. Note de contenu : - MATERIALS AND METHODS : Chemicals - Nanocomposite free-standing films (NFS) preparation - Biodegradability analysis of the NF - Tunable controlled-release urea fertilizer (TCRF) preparation - Characterizations - Nitrogen release test and kinetic study of TCRF
- RESULTS AND DISCUSSION : Swelling performance and the characteristics of the nanoclays - Chemical and physical properties of the NF - Biodegradable ability - Nitrogen release mechanism
- Table 1 : Mechanical properties and contact angles of NF nanocomposite films
- Table 2 : The percentages of biodegradation via the conversion yield of carbon in the sample to carbon dioxide according to the ASTM 5338–98 test method
- Table 3 : Kinetic parameters and diffusion coefficients of various types of TCRFDOI : https://doi.org/10.1007/s11998-022-00688-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00688-w.pdf?pdf=button Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39308
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