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]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 1 (01/2018) . - p. 165-173 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 properties DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30109 [article]

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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)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 3 (05/2017) . - p. 571-582 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 Vert Index. 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 films DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28566 [article]

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Recent strategies of collagen-based biomaterials for cartilage repair : from structure cognition to function endowment / Xiaoyue Yu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 23 p. Titre : Recent strategies of collagen-based biomaterials for cartilage repair : from structure cognition to function endowment Type de document : texte imprimé Auteurs : Xiaoyue Yu, Auteur ; Haiping Zhang, Auteur ; Yiliang Miao, Auteur ; Shanbai Xiong, Auteur ; Yang Hu, Auteur Année de publication : 2022 Article en page(s) : 23 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biopolymères Cartilage Collagène Ingénierie tissulaire Polymères en médecine Régénération (biologie) Index. décimale : 668.9 Polymères Résumé : Collagen, characteristic in biomimetic composition and hierarchical structure, boasts a huge potential in repairing cartilage defect due to its extraordinary bioactivities and regulated physicochemical properties, such as low immunogenicity, biocompatibility and controllable degradation, which promotes the cell adhesion, migration and proliferation. Therefore, collagen-based biomaterial has been explored as porous scaffolds or functional coatings in cell-free scaffold and tissue engineering strategy for cartilage repairing. Among those forming technologies, freeze-dry is frequently used with special modifications while 3D-printing and electrospinning serve as the structure-controller in a more precise way. Besides, appropriate cross-linking treatment and incorporation with bioactive substance generally help the collagen-based biomaterials to meet the physicochemical requirement in the defect site and strengthen the repairing performance. Furthermore, comprehensive evaluations on the repair effects of biomaterials are sorted out in terms of in vitro, in vivo and clinical assessments, focusing on the morphology observation, characteristic production and critical gene expression. Finally, the challenge of biomaterial-based therapy for cartilage defect repairing was summarized, which is, the adaption to the highly complex structure and functional difference of cartilage. Note de contenu : - STRUCTURE AND DEFECTS OF CARTILAGE : The composition of articular cartilage - Hierarchical structure of articular cartilage - The etiology and degree of cartilage defect - Current repair strategies - - STRUCTURE AND FUNCTION OF COLLAGEN : Hierarchical structure of COL I - The role of COL I in cartilage repair - DESIGN AND PREPARATION OF COLLAGEN-BASED BIOMATERIALS FOR CARTILAGE DEFECT REPAIR : Forming and cross-linking of collagen-based biomaterials - Incorporated fabrication of collagen-based biomaterials for cartilage repair - COMPREHENSIVE EVALUATIONS OF CARTILAGE REPAIR BY COLLAGEN-BASED BIOMATERIALS : Physicochemical properties - Bioactivities for cartilage repair - Clinical diagnosis - Table 1 : General methods used to evaluate the bioactivities of biomaterials DOI : https://doi.org/10.1186/s42825-022-00085-4 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00085-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37578 [article]

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