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Fabrication and characterization of polysiloxane/polyacrylate composite latexes with balanced water vapor permeability and mechanical properties: effect of silane coupling agent / Jie Shen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 1 (01/2018)
[article]
Titre : Fabrication and characterization of polysiloxane/polyacrylate composite latexes with balanced water vapor permeability and mechanical properties: effect of silane coupling agent Type de document : texte imprimé Auteurs : Jie Shen, Auteur ; Yang Hu, Auteur ; Ling-Xiao Li, Auteur ; Jian-Wu Sun, Auteur ; Cheng-You Kan, Auteur Année de publication : 2018 Article en page(s) : p. 165-173 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : In order to improve the water vapor permeability and mechanical properties of latex films, polysiloxane/polyacrylate (PSi/PA) composite latexes were fabricated via seeded emulsion polymerization of methyl methacrylate and butyl acrylate onto PSi latex particles, and the effects of the silane coupling agent 3-methacryloyloxypropyl trimethoxysilane (MATS) on the morphologies of the latex particles and films, as well as the microphase separation degree, the water vapor permeability and the mechanical properties of the latex films were investigated. Results indicated that MATS was essential for obtaining the PSi/PA composite latex particles with PSi as core and PA as shell and made a great contribution to restrict the phase separation. The PSi/PA core/shell latex films showed similar tensile strength and elongation with pure PA film, while exhibiting promising water vapor permeability. It was found that the influences of MATS content on the water vapor permeability and mechanical properties were opposite, and on the premise of the requirements for mechanical properties, lower MATS content could provide the PSi/PA core/shell latex films with better water vapor permeability. Note de contenu : - MATERIALS AND METHODS : Materials - Latex preparation - Characterization
- RESULTS AND DISCUSSION : Preparation and colloid property of the latexes - Effect of MATS on the particle morphology - Effects of MATS on the phase structure of the latex films - Effect of MATS on the water vapor permeability - Effect of MATS on the mechanical propertiesDOI : 10.1007/s11998-017-9970-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9970-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30109
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 1 (01/2018) . - p. 165-173[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19610 - Périodique Bibliothèque principale Documentaires Disponible A novel 1,8-naphthalimide green fluorescent dye and its corresponding intrinsically fluorescent polyurethane latexes / Qingjun Jin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 3 (05/2017)
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Titre : A novel 1,8-naphthalimide green fluorescent dye and its corresponding intrinsically fluorescent polyurethane latexes Type de document : texte imprimé Auteurs : Qingjun Jin, Auteur ; Yang Hu, Auteur ; Jie Shen, Auteur ; Botian Li, Auteur ; Ghengyou Kan, Auteur Année de publication : 2017 Article en page(s) : p. 571-582 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants
Fluorescence
Latex
Polyuréthanes
Solidité de la couleur
VertIndex. décimale : 667.9 Revêtements et enduits Résumé : A novel green fluorescent dye, 4-hexylamino-N-(2-hydroxy-1-hydroxymethylethyl)-1,8-naphthalimide (AHHNA), was designed and synthesized, and then used as a chain extender to prepare a series of intrinsically green fluorescent polyurethane (PU) latexes. The chemical structure of AHHNA and the properties of the fluorescent PU latexes and their films were characterized. It was found that the UV–Vis and the fluorescent spectra of the PUs remained fairly consistent with AHHNA, and the fluorescence emitting capacity of 1,8-naphthalimide group was enhanced by covalently bonding AHHNA onto the PU chain. The amount of AHHNA used in the latex preparation had no obvious effect on the latex colloid properties including particle size, poly index, and zeta potential. Results showed that the color difference (?E) and the extraction rate (Re) of the intrinsically fluorescent PU latex film were 5.72% and 3.1%, respectively, while the ?E and Re of the extrinsically fluorescent PU latex film were 8.31% and 84.7%, respectively, indicating that the light fastness and the solvent fastness of the intrinsically fluorescent PU latex film were much better than those of the extrinsically fluorescent PU latex film. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of the fluorescent dyes - Preparation of the intrinsically fluorescent PU-AHHNA latexes - PU latex film preparation - Characterization
- RESULTS AND DISCUSSION : Synthesis and characterization of the fluorescent dyes - Spectral properties of the fluorescent dye AHHNA - UV irradiation stability of the fluorescent dye AHHNA - PU-AHHNA latexes and their colloidal properties - FTIR analysis of PU-AHHNA prepolymer and latex films - Spectral properties of the intrinsically fluorescent PU-AHHNA - Influence of temperature on fluorescent intensity - Stability of the fluorescent PU-AHHNA latexes - Fluorescent spectral of the PU-AHHNA latex film - Light fastness of the fluorescent PU latex films - Solvent fastness of the fluorescent PU latex filmsDOI : 10.1007/s11998-016-9874-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9874-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28566
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 3 (05/2017) . - p. 571-582[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18899 - Périodique Bibliothèque principale Documentaires Disponible