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Synthesis of hydroxy silane coupling agent and the silane-terminated polyurethane chain-extended by butanediol / Chi Quan-chao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)
[article]
Titre : Synthesis of hydroxy silane coupling agent and the silane-terminated polyurethane chain-extended by butanediol Type de document : texte imprimé Auteurs : Chi Quan-chao, Auteur ; Jian Li, Auteur ; Chen-yi Wang, Auteur ; Qiang Ren, Auteur Année de publication : 2022 Article en page(s) : p. 1457-1466 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Butanediol
Caractérisation
Composés organiques -- Synthèse
Essais dynamiques
Hydroxy silane
Polymères -- Synthèse
Polymères à terminaison silane
Polyuréthanes
Réaction de couplage
Résistance à l'humidité
Résistance à la traction
Réticulation à l'humidité
Revêtements -- Propriétés mécaniquesIndex. décimale : 667.9 Revêtements et enduits Résumé : A novel hydroxy silane coupling agent (HO-silane) was synthesized via Michael addition reaction between 2-hydroxyethyl acrylate and 3-mercaptopropyl-trimethoxysilane, which was then used to synthesize the silane-terminated polyurethane (SPU). The silane-terminated polyurethanes, which showed low viscosity due to the end-capping by HO-silane, could be chain-extended by butanediol to enhance the performance of SPU in non-solvent condition. The effects of chain extender, 1,4-butanediol, and NCO/OH molar ratio (R value) on the properties of silane-terminated polyurethane were investigated. The results show that the hydroxy silane coupling agent and the silane-terminated polyurethane that can be moisture-cured at ambient temperature were successfully synthesized. It is found that by introducing the 1,4-butanediol segment into SPU main chain, the viscosity of SPU was increased, but the tack free time of SPU was shortened, and the hardness and tensile strength of the moisture-cured SPU film were enhanced. As the R value increased, the tack free time of the silane-terminated polyurethane was prolonged, and the hardness and the tensile strength of the moisture-cured film were increased, but the elongation at break was decreased. When the amount of 1,4-butanediol was 10 wt% and the R value was 1.3, respectively, silane-terminated polyurethane with viscosity of 51,000 mPa·s (80% solid content) can be obtained. The tensile strength of the moisture-cured film was 1.1 MPa, and the elongation at break was 713.4%, which shows great potential for sealant and coating applications. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hydroxy silane coupling agent (HO-silane) - Synthesis and moisture curing of SPU - Characterization
- RESULTS AND DISCUSSION : Synthesis of silane terminated polyurethane (SPU) - Tack free time of SPU - The performance of SPU - The effect of R value on the performance of SPU - Glass transition temperatures of moisture-cured films of SPUDOI : https://doi.org/10.1007/s11998-022-00619-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00619-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38283
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Code-barres Cote Support Localisation Section Disponibilité 23672 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of a novel hyperbranched polyester with carboxyl end groups applied to UV-curable waterborne coating / Jieming Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Synthesis of a novel hyperbranched polyester with carboxyl end groups applied to UV-curable waterborne coating Type de document : texte imprimé Auteurs : Jieming Liu, Auteur ; Shaoshun Wang, Auteur ; Qiuping Su, Auteur ; Jiajian He, Auteur ; Yong Li, Auteur ; Jing Xie, Auteur ; Guobin Yi, Auteur Année de publication : 2021 Article en page(s) : p. 259-269 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique
Caractérisation
Groupement carboxyle
Hydrostabilité
Polyesters
Polymères -- Synthèse
Polymères ramifiés
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés thermiques
Revêtements en phase aqueuse
Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Rhéologie
SolubilitéIndex. décimale : 667.9 Revêtements et enduits Résumé : A hyperbranched polyester with carboxyl end group (HPC) was synthesized by using trimellitic anhydride and neopentyl glycol as raw materials via A2 + B3 polycondensation. Then, waterborne hyperbranched polyester acrylate (WHPC) was synthesized by partially modifying the carboxylic groups of HPC with glycidyl methacrylate. In order to explore the influence of molecular weight, acrylate groups content, and ion groups content on performances, a series of WHPC films with different molecular weight, acrylate groups content, and ion groups content were prepared. The dynamic light scattering spectrometer analysis shows that the higher ionic groups content and the lower molecular weight cause the smaller particle size. The ionic group content has a positive effect on the solubility. The smaller molecular weight and particle size cause the lower viscosity. The Fourier-transform IR spectrophotometer reveals that the double bond final conversion increased with increasing acrylate groups content. The final conversion is between 69 and 86%. The curing speed is fast, and the curing time is about 70 s due to the numerous end groups owned by the hyperbranched structure. The dynamic mechanical thermal analysis coupled with end-use mechanical property tests illustrates that the crosslink density has a positive effect on the storage modulus and a negative effect on the flexibility. It is also found that glass transition temperature and pencil hardness are determined by the balance between crosslink segment and hyperbranched polyester segment. The thermogravimetric analysis proves that increased crosslink density and molecular weight promote the heat resistance of films. This work utilizes a novel hyperbranched structure that excels in viscosity, flexibility, and water solubility. Furthermore, the preparation process is convenient. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hyperbranched polyester with carboxyl end groups (HPC) - Synthesis of waterborne hyperbranched polyester acrylate (WHPC) - Neutralization of the prepolymer - Dispersion formation - UV curing - Measurements
- RESULTS AND DISCUSSION : Characterizations of hyperbranched polyester - Gel permeable chromatography (GPC) analysis - Particle size - Rheological behavior - Water solubility and stability - Curing kinetics and boule bond conversion - Dynamic mechanical thermal analysis (DMTA) - Thermal properties
- Table 1 : Sample designation and stoichiometric ration of -COO- and GMA for the preparation of WHPC
- Table 2 : The particle diameter in water and COO- groups content of WHPCs
- Table 3 : Dynamic mechanical properties of the UV-cured coatings
- Table 4 : The mechanical properties and performance of the UV-cured coatings
- Table 5 : The degradation temperature at 5% weight lossDOI : https://doi.org/10.1007/s11998-020-00404-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00404-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35368
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of (Sty-co-BA-AA) latexes including ZnO and TiO2 nanoparticle by miniemulsion polymerization / Ali Delibas in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
[article]
Titre : Synthesis of (Sty-co-BA-AA) latexes including ZnO and TiO2 nanoparticle by miniemulsion polymerization Type de document : texte imprimé Auteurs : Ali Delibas, Auteur Année de publication : 2021 Article en page(s) : p. 717-727 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Jaunissement (défaut)
Latex
Miniémulsions
Nanoparticules
Polymérisation en émulsion
Revêtements -- Propriétés mécaniques
Styrène-co-butylacrylate-acide acryliqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Herein, it is reported that synthesis of poly(styrene-co-butyl acrylate) latexes containing ZnO and TiO2 nanoparticles was carried out using miniemulsion polymerization. The synthesized latexes and films cast from them were characterized by dynamic light scattering (DLS), X-ray diffraction (XRD), scanning electron microscopy energy dispersive X-ray (SEM-EDAX), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). Stress–strain and DMA analysis was performed for the mechanical analysis of the films prepared from latexes. The particle sizes of the latexes were about 60 nm for pure latex and latex only containing ZnO and TiO2, while the particle size for latex containing nanoparticle mixture was measured as 120 nm. XRD, SEM-EDAX, and TEM analysis results showed that the nanoparticles were well dispersed in latex. When the mechanical analysis results were compared, latex films including 2% ZnO nanoparticles were found to be stronger. DMA analysis showed that the glass transition temperature (Tg) values of the polymers were between 0 and 10°C and the nanoparticles were not effective in changing the Tg values. Latex films were exposed to 254 nm UV light to determine their yellowing. According to the colorimetric measurement, ZnO nanoparticle-embedded films were found to be more resistant to yellowing. Note de contenu : - EXPERIMENTAL : Materials - Experimental procedure - Characterization
- RESULTS AND DISCUSSION : XRD results - TGA results - SEM and TEM results - Mechanical properties of the latex films - Yellowing test of the latex films
- Table 1 : Miniemulsion polymerization recipe for nanocomposite latexes
- Table 2 : Effect of nanoparticles on SC, zeta potential, and particle size
- Table 3 : Stress–strain results of the prepared latex films
- Table 4 : Yellowing results of the latex filmsDOI : https://doi.org/10.1007/s11998-020-00436-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00436-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35924
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Code-barres Cote Support Localisation Section Disponibilité 22785 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of trimethylolpropane esters of tall oil fatty acids and properties of polyurethane coatings on their basis / Vladimir Yakushin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 2 (03/2016)
[article]
Titre : Synthesis of trimethylolpropane esters of tall oil fatty acids and properties of polyurethane coatings on their basis Type de document : texte imprimé Auteurs : Vladimir Yakushin, Auteur ; Maria Misane, Auteur ; Oskars Bikovens, Auteur ; Dzintra Vilsone, Auteur ; Irina Sevastyanova, Auteur Année de publication : 2016 Article en page(s) : p. 317-324 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides gras
Esters
Polyols
Polyuréthanes
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements:Peinture
TriméthylolpropaneIndex. décimale : 667.9 Revêtements et enduits Résumé : Tall oil fatty acids (TOFA) were esterified with trimethylolpropane (TMP) without a catalyst at different molar ratios of TMP to TOFA. A molar ratio was defined, at which a polyol stable in long-term storage, with the maximum content of TMP monoesters, was synthesized. Fourier transform infrared spectroscopy and gas chromatography were used for the identification of the polyols’ chemical structure and composition. Based on the synthesized polyols, polyurethane coatings were prepared. The effect of the isocyanate index and concentration of traditional Sn-based and less toxic Bi-based catalysts on the gel time of the polyurethane composition, and the mechanical and thermal properties of the coatings was studied. It was found that the new coatings had high tensile strength and modulus of elasticity, comparable with the strength and modulus of the polyurethane based on diethanolamides of TOFA. The initial temperature of decomposition of these coatings was higher than that of the polyurethanes based on esters of TOFA and a number of uralkyds. The coatings based on TMP esters of TOFA were obtained without the use of solvents, and potentially, these esters can be used in spray-applied VOC-free polyurethane coatings’ formulation. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of polyols - Polyol analysis - Preparation and characterization of polyurethane coatings
- RESULTS AND DISCUSSION : Properties of polyols - Properties of polyurethanesDOI : 10.1007/s11998-015-9747-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9747-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26116
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Code-barres Cote Support Localisation Section Disponibilité 17962 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of vanillin-based UV curable polyurethane dispersions for wood coating applications / Darshan Mahajan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)
[article]
Titre : Synthesis of vanillin-based UV curable polyurethane dispersions for wood coating applications Type de document : texte imprimé Auteurs : Darshan Mahajan, Auteur ; Darbha Sai Srivats, Auteur ; Aarti More, Auteur Année de publication : 2023 Article en page(s) : p. 1773-1788 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biopolymères
Biopolymères -- Synthèse
Bois -- Revêtements
Caractérisation
Chimie analytique
Composés organiques -- Synthèse
Dispersions et suspensions
Enrobage (technologie)
Formulation (Génie chimique)
Polymères en émulsion
Polyuréthanes
Résistance aux taches
Résistance chimique
Revêtements -- Propriétés mécaniques
Revêtements en phase aqueuse
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Partial incorporation of bio-based diol in the synthesis of UV-curable polyurethane dispersion (PUDs) has been studied. The bio-based diol was synthesized from vanillin. Divanillin (DV) was used as a partial replacement for polyethylene glycol an industrial diol. PUDs were synthesized by reacting vanillin and polyethylene glycol in different percentages (10:90, 30:70, and 50:50) with isophorone diisocyanate along with 2-dimethyl propionic acid. Hydroxyethyl methacrylate is attached to incorporate unsaturation, which helps in the UV curing process, and triethyl amine is used for acid group neutralization. The synthesis of DV and resin was confirmed by FTIR spectroscopy. Divanillin synthesis confirmation was carried out by NMR spectroscopy. The synthesized resin was dispersed in water and applied on a wooden panel. Mechanical testing, like scratch resistance, pencil hardness, and cross-hatch adhesion tests, was carried out on the cured coatings to determine their properties. The 30% incorporation of DV shows the highest pencil hardness (2H) and scratch hardness (0.90 kg) among all the DV formulations and the results were comparable to plain formulation. The 30% DV also exhibits good gloss at 60° angle with value of 76.7. Coatings exhibited excellent acid resistance and moderate resistance towards alkalis. TGA was performed on the plain PU and 30% DV and the onset temperatures were 190 °C and 185 °C, respectively. All the dispersions formed were tested to determine their particle size, and the particle size distributions were in the range of 3–55 µm. Gel content percentages for all the samples were in the range of 90–97%. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of divanillin - Synthesis of polyurethane resin - Preparation of polyurethane dispersion and preparation of coating - Characterization
- RESULTS AND DISCUSSION : FTIR - NMR analysis - Contact angle - Mechanical properties - Chemical prperties - Thermogravimetric analysis (TGA) - Particle size analysis of polyurethane dispersion - Gel content
- Table 1 : Formulations of synthesized resin with different ratios of divanillin (DV) to PEG
- Table 2 : Results of mechanical properties
- Table 3 : Chemical resistance of the coating
- Table 4 : Stain resistance of coating
- Table 5 : Polyurethane dispersion particle diameter values after synthesis (D10, D50, and D90)
- Table 6 : Polyurethane dispersion particle diameter values after 6 months (D10, D50, and D90)DOI : https://doi.org/10.1007/s11998-023-00780-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00780-9.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39987
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