Preparation and properties of a novel coating based on bismaleimides via Michael addition reaction / Jiajian He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 6 (11/2022) . - p. 1731-1741 Titre : Preparation and properties of a novel coating based on bismaleimides via Michael addition reaction Type de document : texte imprimé Auteurs : Jiajian He, Auteur ; Kai Cheng, Auteur ; Ruijun Lin, Auteur ; Qiuping Su, Auteur ; Yong Li, Auteur ; Zhiping Ma, Auteur ; Shaoshun Wang, Auteur ; Yuxin Gu, Auteur ; Xiaofeng Lin, Auteur ; Wenjing Lin, Auteur ; Guobin Yi, Auteur Année de publication : 2022 Article en page(s) : p. 1731-1741 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Caractérisation Enrobage (technologie) Michael, Addition de L'addition de Michael ou réaction de Michael est une réaction qui permet la création de liaisons carbone-carbone, voire de liaisons carbone-soufre. Il s'agit de l'addition nucléophile d'un carbanion sur un composé carbonylé α,β insaturé (aldéhyde, cétone et même ester α,β insaturé, des nitriles et des amides α,β insaturés pouvant aussi être utilisés). Elle appartient à la famille des additions nucléophiles conjuguées. Cette réaction doit son nom au chimiste américain Arthur Michael. Polycondensation Polyesters Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements organiques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, a malonate polyester suitable for Michael addition reaction was prepared by melting polycondensation of neopentyl glycol, terephthalic acid, and diethyl malonate, and its structure was characterized by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy (NMR). Then, Michael addition reaction between malonate polyester and diphenylmethane bismaleimide (BDM), catalyzed by 1, 8-diazabicyclo [5.4.0] undec-7-ene (DBU)/benzoic acid salt, was carried out to prepare the films with different contents of curing agent. The thermal and mechanical properties of the films were characterized by dynamic thermomechanical analysis, thermogravimetric analysis, and differential scanning calorimetry. We found that glass transition temperature (Tg) of the films increased with the increase in BDM amount. The Tg could reach up to 80°C, which indicated that the fabricated films show excellent thermal stability. Note de contenu : - EXPERIMENTAL : Materials - Preparation of malonate polyester - Preparation of DBU/benzoic acid salt - Formulation of coatings - Characterization of coatings - RESULTS AND DISCUSSION : Characterization of malonate polyester - Characterization of DBU/benzoic acid salt - Characterization of films - Table 1 : Preparation of malonate polyester - Table 2 : Proportion of samples and materials used in Michael addition reaction - Table 3 : Thermal properties of malonate polyester - Table 4 : Properties of the films - Table 5 : Thermal properties of films - Table 6 : DMA of the films - Table 7 : Tensile properties of the six films DOI : https://doi.org/10.1007/s11998-022-00644-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00644-8.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38493 [article]

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Synthesis of a curing agent containing trifunctional epoxy groups for powder coatings and its curing reaction kinetics / Qiuping Su in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 907-917 Titre : Synthesis of a curing agent containing trifunctional epoxy groups for powder coatings and its curing reaction kinetics Type de document : texte imprimé Auteurs : Qiuping Su, Auteur ; Zilun Tang, Auteur ; Jiajian He, Auteur ; Yuxin Gu, Auteur ; Yong Li, Auteur ; Jing Xie, Auteur ; Shaoshun Wang, Auteur ; Ruijun Lin, Auteur ; Xiaofeng Lin, Auteur ; Wenjing Lin, Auteur ; Guobin Yi, Auteur Année de publication : 2022 Article en page(s) : p. 907-917 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cinétique chimique Composés organiques -- Synthèse Morphologie (matériaux) Polyesters Polymérisation Réticulants Revêtements organiques Revêtements poudre Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, tris(oxiran-2-ylmethyl) benzene-1,3,5-tricarboxylate (TOTC) was synthesized by a new two-step method without using harmful epichlorohydrin and served as a curing agent for polyester powder coatings. The chemical structure of TOTC was determined by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The curing behavior and the curing reaction kinetics of TOTC/polyester resin (NH-3307) system were studied by dynamic differential scanning calorimetry. The activation energy Ea was 71.75 kJ mol-1 according to Flynn–Wall–Ozawa method, and the curing reaction of TOTC/NH-3307 system was described by Friedman method. It was found that the curing reaction of TOTC/NH-3307 system was a two-parameter autocatalysis which followed the Å estάk–Berggren model. The nonisothermal curing reaction rate was simulated according to the Å estάk–Berggren model and the experimentally parameters. What is more, the thermogravimetric analysis results showed that the TOTC/NH-3307 system had good thermal stability with an initial decomposition temperature of 374.92°C. The TOTC/NH-3307 cured film exhibited excellent leveling performance by SEM. The results demonstrated that TOTC has efficient curing ability and huge market potential. Note de contenu : - Experimental : Materials - Methods : Synthesis of triallyl benzene-1,3,5-tricarboxylate (TATC) - Synthesis of tris(oxiran-2-ylmethyl) benzene-1,3,5-tricarboxylate (TOTC) - Preparation of powder coatings - Characterization and instrumentation - Results and discussion : Synthesis and characterization of TOTC - Curing kinetics and mechanism analysis : Nonisothermal DSC cure - Curing kinetics - Curing mechanism - Thermal stability analysis - Surface morphology analysis - Table 1 : Characteristic parameters of TOTC/NH-3307 powder coating system - Table 2 : Characteristic peak conversion values and calculated kinetic parameters for autocatalytic model at different heating rates DOI : https://doi.org/10.1007/s11998-021-00578-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00578-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38085 [article]

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Synthesis of xylitol-based hyperbranched polyurethane acrylate and its application in self-matting acrylate coatings / Ruijun Lin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 5 (09/2023) . - p. 1579-1594 Titre : Synthesis of xylitol-based hyperbranched polyurethane acrylate and its application in self-matting acrylate coatings Type de document : texte imprimé Auteurs : Ruijun Lin, Auteur ; Xingshan Yin, Auteur ; Huameng Liu, Auteur ; Lijing Chen, Auteur ; Jianxin Wu, Auteur ; Liang Liu, Auteur ; Yuxin Gu, Auteur ; Yong Li, Auteur ; Xiaofeng Lin, Auteur ; Wenjing Lin, Auteur ; Guobin Yi, Auteur Année de publication : 2023 Article en page(s) : p. 1579-1594 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agent mattant Caractérisation Copolymère uréthane acrylate Copolymères -- Synthèse Formulation (Génie chimique) Polyacryliques Polymères ramifiés Potentiel zeta Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse Stabilité thermique Taille des particules Xylitol Index. décimale : 667.9 Revêtements et enduits Résumé : Self-matting acrylate has attracted much interest due to excellent weather resistance, hardness, water resistance, and chemical resistance. However, the poor mechanical properties of acrylate limit its application in coatings. To overcome this problem, a series of self-matting acrylate emulsions (SMAE) modified by xylitol-based hyperbranched urethane acrylate (HP-IH) were successfully synthesized. The results revealed that the amount of emulsifier was the primary factor affecting the gloss of the films. Upon the incorporation of HP-IH, the elongation at break and fracture energy of the SMAE films were significantly improved by 52.6% and 59.6%, respectively, due to the internal plastic effect and increased crosslink density induced by HP-IH. The S-2-1.5 sample exhibited the excellent comprehensive performance, i.e., tensile strength of 12.7 MPa, elongation at break of 952%, fracture energy of 71.1 MJ/m3, adhesion of 5B, temperature of 5% weight loss at 350 °C, and gloss at 60° of 14.8, respectively, indicating its great application potential in the field of low-gloss coatings. Note de contenu : - MATERIALS : Synthesis of hydroxyl-terminated hyperbranched polyester (HP-OH) - Synthesis of xylitol-based hyperbranched urethane acrylate (HP-IH) - Synthesis of self-matting acrylate emulsion (SMAE) - Preparation of self-matting acrylate films - Characterization - RESULTS AND DISCUSSION : Chemical structural characterization - Table 1 : Basic formulations for the preparation of self-matting acrylate emulsion - Table 2 : Average particle size and zeta potential of SMAE with different amounts of HP-IH - Table 3 : Thermal stabilities of the SMAE films - Table 4 : Dynamic mechanical properties of the SMAE films - Table 5 : Comprehensive properties of SMAE DOI : https://doi.org/10.1007/s11998-023-00764-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00764-9.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39973 [article]

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