Preparation and characterization of acrylic resin/protein composite crosslinked films / X. H. Qiang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 6 (11/2014) . - p. 923-931 Titre : Preparation and characterization of acrylic resin/protein composite crosslinked films Type de document : texte imprimé Auteurs : X. H. Qiang, Auteur ; Q. Xue, Auteur ; H. Zhang, Auteur ; Z. Yan, Auteur ; M. Li, Auteur ; W. Xu, Auteur ; Y. J. Wang, Auteur Année de publication : 2014 Article en page(s) : p. 923-931 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages. Couches minces Polyacryliques Protéines Revêtements -- Propriétés chimiques:Peinture -- Propriétés chimiques Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Traction (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : A series of ambient self-crosslinkable acrylic resin/protein composite emulsions (PA–Ps) were prepared by copolymerizing the functional monomer acetyl acetylethyl methacrylate (AAEM) with methyl acrylate, butyl acrylate and acrylic acid, and then protein crosslinking agents such as gelatin and casein were also added. The PA–P films were characterized by Fourier transform IR spectroscopy, contact angles, differential scanning calorimeter, thermogravimetric analysis, antisolvent testing and physicomechanical testing. Influences of AAEM and protein dosages on properties of composite films were examined in detail. The results indicate that influences of AAEM and protein on PA–P films are diverse on solvent resistance, physicomechanical properties and thermal properties. With enhancement of AAEM and protein dosages, hardness, solvent resistance to tetrahydrofuran and glass transition temperature (Tg) of PA–P films are markedly enhanced, but the decomposing temperatures (Td) are decreased. Tensile strengths are evidently reinforced while elongations at break are lessened. Suitable AAEM and protein dosages could render PA–P films with good water resistance. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of acrylic resin/protein composite crosslinked films - Characterization and performance tests of acrylic resin/protein composite films - RESULTS AND DISCUSSIONS : Mechanism ans characterization of crosslinking - Hardness, appearance and tackiness of the film - Water absorption rate - Solvent resistance - Mechanical properties - Thermal properties of the prepared films DOI : 10.1007/s11998-014-9599-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9599-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22315 [article]

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The influence of age, gender and race/ethnicity of the composition of the human axillary microbiome / M. Li in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 41, N° 4 (08/2019)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 41, N° 4 (08/2019) . - p. 371-377 Titre : The influence of age, gender and race/ethnicity of the composition of the human axillary microbiome Type de document : texte imprimé Auteurs : M. Li, Auteur ; A. E. Budding, Auteur ; M. van der Lugt-Degen, Auteur ; L. Du-Thumm, Auteur ; M. Vandeven, Auteur ; Aixing Fan, Auteur Année de publication : 2019 Article en page(s) : p. 371-377 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Âge Aisselles Femmes Groupe ethnique Hommes Microbiome cutané Transpiration Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : The microbial community plays an important role in the generation of human axillary odour by transforming odourless natural secretions into volatile odorous molecules. A limited number of traditional culturing methods and molecular based research have been performed to characterize the human axillary microbiome in small collection sample sizes. Moreover, only a few have considered the interpersonal variations across age, gender or race/ethnicity, and none have included all three variables within one single study. The aim of this study was to characterize the axillary microbiome of healthy subjects across different age groups, genders and races/ethnicities in a large sample size. - Methods : The underarm skin swab samples were collected from 169 healthy subjects. The axillary microbiome was analysed by IS‐pro, a clinically validated high‐throughput DNA fingerprinting technique. - Results : The results indicate that the senior subjects (55+) tend to have a higher number of total bacterial than younger adults (of a defined age). The diversity of odour causing bacteria, e.g. corynebacteria, increases with age. Among the three races/ethnicities studied, East Asians have a unique microbial composition compared to Caucasians and Hispanics, which may contribute to the different odour profiles observed among the races/ethnicities studied. - Conclusion : Human axillary microbiome varies by age, gender and race/ethnicity. This study has provided an unprecedented fundamental knowledge about the axillary microbiota as a function of age, gender and race/ethnicity. Note de contenu : - MATERIALS AND METHODS : Subject recruitment - Sample collection - IS-profiling of axillary microbiota and data analysis - RESULTS : Overall diversity of human axillary microbiome - Age effect on human axillary microbiome - Gender effect on the human axillary microbiome - Race/ethnicity effect on the human axillary microbiome DOI : 10.1111/ics.12549 En ligne : https://drive.google.com/file/d/1HL6JX5m_QbjAPdK9oHUZ0x88HyxQ7USd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33116 [article]

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The porous structure and mechanical properties of injection molded HA/PA66 scaffolds / S. Zhou in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 4 (08/2014)

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 4 (08/2014) . - p. 454-460 Titre : The porous structure and mechanical properties of injection molded HA/PA66 scaffolds Type de document : texte imprimé Auteurs : S. Zhou, Auteur ; Y.-B. Li, Auteur ; Y.-Y. Wang, Auteur ; Y. Zuo, Auteur ; S.-B. Gao, Auteur ; M. Li, Auteur ; Li Zhang, Auteur Année de publication : 2014 Article en page(s) : p. 454-460 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites -- Propriétés mécaniques Echafaudages Hydroxyapatite L'hydroxyapatite est une espèce minérale de la famille des phosphates, de formule Ca5(PO4)3(OH), usuellement écrite Ca10(PO4)6(OH)2 pour souligner le fait que la maille de la structure cristalline comprend deux molécules. L'hydroxyapatite est le membre hydroxylé du groupe apatite. L'ion OH- peut être remplacé par le fluor, le chlore ou le carbonate. L'hydroxyapatite cristallise dans le système hexagonal. La poudre d'hydroxyapatite pure est blanche. Celles que l'on trouve dans la nature peuvent cependant être de couleur marron, jaune ou verte. Matériaux poreux Mousses plastiques -- Moulage par injection Mousses plastiques -- Propriétés mécaniques Polyamide 66 Index. décimale : 668.4 Plastiques, vinyles Résumé : Hydroxyapatite/polyamide-66 (HA/PA66) composite scaffolds were prepared using injection-molding technique, and also analyzed by means of scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), Fourier transform infrared spectroscopy (FTIR) and mechanical testing. Compared with common methods including solvent casting/particulate leaching, phase separation and so forth to fabricate scaffolds, this process is of a rapid and convenient manner. The increase of HA content can increase the stiffness of composite scaffolds accompanied by the reduction of impact strength, pore size and porosity. The storage modulus of composite scaffolds increases with increasing HA content and with decreasing porosity. The damping (tan δ) of PA66 decreases with the increase of HA content, and the α and β relaxation peaks of PA66 for the foamed HA/PA66 composites slightly shift to lower value, indicating that both HA and gas in the foamed HA/PA66 composites have an effect on the chain mobility of the polymer and the interaction between the polymer chains. The microstructure of the 30 wt% and 40 wt% HA/PA66 composite scaffolds with porosity more than 59 % and pore size ranging from 100 to 500 μm is similar to that of dry human trabecular bone. The obtained composite scaffolds with 30 wt% and 40 wt% HA have a compressive modulus of 232 to 443 MPa, and a compressive strength of 9.3 to 9.8 MPa, similar to or a little higher than those of trabecular bone, and close to those of the cancellous bone. Note de contenu : - EXPERIMENTAL : Materials - Preparation of composite scaffolds - Morphology observations of composite scaffolds - Determination of the porosity of composite scaffolds - Mechanical testing of composite scaffolds - Dynamic mechanical measurement of composite scaffolds - Fourier-Transform Infrared Spectroscopy - Melt Fow Index (MFI) measurement of pure PA66 and HA/PA66 composites - RESULTS AND DISCUSSION : Infrared spectroscopic analysis - Effect of HA content on the mechanical properties and porosity - Effect of HA content on the porous structure - Dynamic mechanical properties DOI : 10.3139/217.2851 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21824 [article]

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