Crosslinked polyurethane–epoxy hybrid emulsion with core–shell structure / Wen Xiufang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 3 (05/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 3 (05/2010) . - p. 373-381 Titre : Crosslinked polyurethane–epoxy hybrid emulsion with core–shell structure Type de document : texte imprimé Auteurs : Wen Xiufang, Auteur ; Ruilian Mi, Auteur ; Huang Ying, Auteur ; Jiang Cheng, Auteur ; Pi Pihui, Auteur ; Zuohru Yang, Auteur Année de publication : 2010 Article en page(s) : p. 373-381 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Polyuréthanes Réticulation (polymérisation) Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : An epoxy resin was used to prepare crosslinked polyurethane hybrid emulsion through the blocked NCO prepolymer mixing process. Due to their hydrophobicity, the amine chain extender, blocked –NCO, and epoxy are located inside the emulsion particles. Thus, the crosslinking reaction occurs mostly in the interior of the particles. In this way, the crosslinking density of the resin is increased without the use of solidifying agents or heating during film formation, and the stability of the emulsions remains uninfluenced. The effects of the type of amine chain extender and the type, dosage, and addition mode of the epoxy resin were studied in terms of mechanical properties and swelling properties in water and toluene of the cast films. Additionally, the stability of the single-pack hybrid emulsion was studied. The results showed that the sample prepared with diethylene triamine had good stability, chemical resistance, and high mechanical strength. The modulus and water resistance of the films increased with the epoxy resin content, which could reach 20 wt %. The type of amine chain extender affected the stability of the emulsions significantly. The molar ratio of NH/NCO at 1:1 led to the best film performance. The optimal temperature of the chain-extension reaction was approximately 80°C. The hybrid emulsions could be stored for at least 6 months without apparent performance changes. DOI : 10.1007/s11998-009-9196-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9196-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9816 [article]

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Synthesis and characterization of fluorine-containing poly-styrene-acrylate latex with core–shell structure using a reactive surfactant / Guilong Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 3 (05/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 3 (05/2011) . - p. 401-407 Titre : Synthesis and characterization of fluorine-containing poly-styrene-acrylate latex with core–shell structure using a reactive surfactant Type de document : texte imprimé Auteurs : Guilong Xu, Auteur ; Lili Deng, Auteur ; Wen Xiufang, Auteur ; Pi Pihui, Auteur ; Dafeng Zheng, Auteur ; Jiang Cheng, Auteur ; Yang Zhuoru, Auteur Année de publication : 2011 Article en page(s) : p. 401-407 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère styrène acrylique Core-Shell Fluorine Latex Surfactants réactifs Index. décimale : 667.9 Revêtements et enduits Résumé : Fluorine-containing poly-styrene-acrylate (PSA) latex with core–shell structure was successfully synthesized by seeded semicontinuous emulsion polymerization using fluorine monomer Actyflon-G04 and reactive emulsifier DNS-86. The chemical composition, morphology of latex, and surface composition of the latex film were characterized by Fourier transform infrared spectra, transmission electron microscopy, and X-ray photoelectron spectroscopy, respectively. The stability properties of latex were tested by Ca2+, centrifugal and mechanical stability tests, and the latex film was studied by water contact angle, water absorption ratio, and thermo-gravimetric analysis. The results show that fluorine-containing PSA latex particles with crosslinked core and crosslinked shell structure have excellent stability properties, and the film of latex has excellent water repellency, thermal stability, and chemical resistance properties when the amount of fluorine monomer was only 8.0 wt %. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of the fluorine-containing PSA latex latex nanoparticles with core-shell structure - Characterization. - RESULTS AND DISCUSSION : FTIR analysis - Effect of crosslinking - Micromorphology of the core-shell latex nanoparticles - XPS analysis - Stability of the prepared latex - Water repellency and chemical resistance properties of the latex film - Thermal stability of the prepared latex film. DOI : 10.1007/s11998-010-9308-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9308-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11679 [article]

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