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Effects of dehydration methods on the characteristics of fibrous networks from un-tanned hides / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 3 (03/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 3 (03/2012) . - p. 70-77 Titre : Effects of dehydration methods on the characteristics of fibrous networks from un-tanned hides Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur ; Maryann M. Taylor, Auteur ; Renée J. Latona, Auteur Année de publication : 2012 Article en page(s) : p. 70-77 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Cuirs et peaux Cuirs et peaux -- Séchage Filtres à air Lyophilisation Microscopie électronique à balayage Résistance des matériaux Rupture (mécanique) solvants Traction (mécanique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : To improve prospective markets and to secure a viable future for the hides and leather industries, it is important to develop new uses and novel biobased products from hides. We hypothesize collagen fiber networks derived from un-tanned hides can be utilized to prepare high performance green composites and air filters, of which both have a great market potential. Collagen fiber networks were obtained from split hides after the bating step in the tanning process in order to remove the noncollagenous materials from the hides. This study was devoted to understand the effects of a key processing step--dehydration on the morphology and physical properties of the resultant fiber networks, which will be the starting material for constructing air filters and green composites. Five dehydration methods were investigated and observation showed solvent- and freeze- drying yielded the lowest apparent density indicating a higher degree of separation in the fibrous networks that will be favorable for further processing into useful products. SEM observations also confirmed the fibers were more separated from solvent- and freeze-drying than those from other the dehydration methods. Mechanical testing showed the lower apparent density led to lower tensile strength, greater elongation at break, lower Youngs modulus, and higher toughness. The results of this research will be useful for the production of high quality fibrous products and green composites. Note de contenu : - EXPERIMENTAL : Materials and procedures - Mechanical property evaluations - Acoustic emission (AE) - Microscopic observation - RESULTS AND DISCUSSION : Mechanical properties En ligne : https://drive.google.com/file/d/12MkGyUvj9Gms3nVtnu3Nnb3UBhQ8EPUj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14418 [article]

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Factors influencing the seam efficiency of goat nappa leathers / K. Phebe in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 3 (03/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 3 (03/2012) . - p. 78-84 Titre : Factors influencing the seam efficiency of goat nappa leathers Type de document : texte imprimé Auteurs : K. Phebe, Auteur ; Palanisamy Thanikaivelan, Auteur ; K. Krishnaraj, Auteur ; B. Chandrasekaran, Auteur Année de publication : 2012 Article en page(s) : p. 78-84 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Couture Cuir pleine fleur Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de chèvres Vêtements en cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Apparel making is the process of making shell structures from flat fabrics or leathers to match the shape of human body. During this process, leathers are subjected to various types of mechanical stresses, which are indispensable for the garment appearance. The present study involves investigating the mechanical properties of goat nappa leathers such as seam strength, breaking strength, seam efficiency, tensile strength, percent elongation, double hole stitch tear strength, flexural rigidity, initial tensile modulus and formability and establishing a relationship between seam efficiency and other mechanical properties. Seam efficiency of goat nappa leathers chosen in this study range from 55 to 76% in both parallel and perpendicular directions to the backbone. It has been observed that breaking strength of goat nappa leathers seems to have a significant influence on seam efficiency among the various mechanical properties studied with a negative correlation (R = –0.92). This means that modifications in fatliquoring and other related leather processing steps may offer low strength goat nappa leathers with more softness leading to enhanced seam efficiency. These results would help tanners and leather garment manufacturers to make appropriate selection of leather processing steps and sewing procedures, thereby avoiding possible economic losses. Note de contenu : - EXPERIMENTAL : Materials - Flexural rigidity - Tensile strength and extension - Initial tensile modulus - Formability - Seam strength - Breaking strength - Stitch tear strength (double hole) - Seam efficiency - RESULTS AND DISCUSSION : Seam efficiency - Seam efficiency versus seam strength - Seam efficiency versus breaking strength - Seam efficiency versus tensile properties - Seam efficiency versus stitch tear strength (double hole - Seam efficiency versus flexural rigidity - Seam efficiency versus initial tensile modulus - Seam efficiency versus formability En ligne : https://drive.google.com/file/d/1lKg-3bnD_ZNoxOtM2mjRl49IFV3RUpjG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14419 [article]

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Preparation of antibacterial sheepskin with silver nanoparticles : potential for use as a mattress for pressure ulcer prevention / Weite Yang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 3 (03/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 3 (03/2012) . - p. 85-91 Titre : Preparation of antibacterial sheepskin with silver nanoparticles : potential for use as a mattress for pressure ulcer prevention Type de document : texte imprimé Auteurs : Weite Yang, Auteur ; Xuan Wang, Auteur ; Ying Gong, Auteur ; Li Hui, Auteur ; Wuyong Chen, Auteur ; Carmen Gaidau, Auteur Année de publication : 2012 Article en page(s) : p. 85-91 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Argent Cuirs et peaux -- Emploi en thérapeutique Cuirs et peaux de moutons Nanoparticules Peau -- Ulcères -- Prévention Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the study, sheepskin was treated with silver nanoparticles, which were prepared at the concentration of 2.4×10-2 g·L-1 with average particles size about 26 nm. And then, the adsorption of the silver nanoparticles by the sheepskin, as well as the morphology and the antibacterial effect of the treated sheepskin were investigated. The UV-vis absorption spectroscopy indicated nearly all of the silver nanoparticles were adsorbed by the sheepskin with this method. From scanning electron microscopy (SEM) observations, it was confirmed that the nanoparticles attached on the surface of the sheepskin. The antibacterial effect of the treated sheepskin was evaluated after repeated perspiration treatments. The results of antibacterial study showed that the treated sheepskin had an antibacterial inhibition of 99.9% against Escherichia coli and Staphylococcus aureus, even after 6 cycles of perspiration treatment, the sheepskin still exhibited a durable antibacterial effect with the inhibition rate above 79.4% and 67.1% respective to the leather and the wool. Thus, this study has provided an eco-friendly alternative for the preparation of antibacterial sheepskin without organic compounds, which would be potentially used as a mattress for pressure ulcer prevention. Note de contenu : - EXPERIMENTAL : Materials - Preparation of silver nanoparticles - Antimicrobial activity of the silver nanoparticles En ligne : https://drive.google.com/file/d/1IjeVq35JlVkkZUgWR5AKGpL321I1NCZx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14420 [article]

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The effect of nano polysiloxanes on the permanence of feel touch of finished leathers / Evrim Kadioglu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 3 (03/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 3 (03/2012) . - p. 92-101 Titre : The effect of nano polysiloxanes on the permanence of feel touch of finished leathers Type de document : texte imprimé Auteurs : Evrim Kadioglu, Auteur ; Gökhan Zengin, Auteur ; Altan Afsar, Auteur Année de publication : 2012 Article en page(s) : p. 92-101 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse sensorielle Cuir Cuirs et peaux -- Finition Evaluation Nanoparticules Particules (matières) Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Polymères en émulsion Toucher Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Nano sized aminofunctional and micron sized dimethyl polysiloxane emulsions were applied to garment leathers as topcoats, to investigate the improvement on feel touch permanency of finished leathers. Fourier Transform Infrared Spectroscopy (FTIR) and particle size analysis of these two polysiloxane emulsions were carried out. The optimum application amount of emulsions was determined to be 15% based on the results of organoleptic evaluation and dynamic friction coefficients. After the application of nano and micron sized polysiloxane, three different accelerated ageing processes were applied to leathers under controlled temperature, humidity and UV light conditions. For determining the effect of the ageing processes on these polysiloxanes, dynamic friction coefficient measurements, ICP-OES and SEM analysis were carried out. The results revealed that nano sized polysiloxanes clearly improved the feel touch permanency of finished leathers in comparison to the leathers coated with micron sized polysiloxanes. Thereby, it was demonstrated that nano polysiloxanes can maintain the appearance and feel touch of leather product for a longer periods of time. Note de contenu : - EXPERIMENTAL : Materials - Finishing application - Particle size analysis - Fourier Transform Infrared Spectroscopy (FTIR) analysis - Organoleptic evaluation and dynamic friction coefficient measurements of feel touch of finished leathers - Accelerated ageing process - Rub fastness of aged leathers - Determination of silicone content of leather samples by inductively coupled plasma optical emission spectrometer (ICP-OES) - Scanning electron microscopy (SEM) microcraphs of leather samples - Statistical analysis - RESULTS AND DISCUSSION : Particle size analysis - Fourier Transform Infrared Spectrophotometer (FTIR) analysis - Organoleptic evaluations and dynamic friction coefficient measurements - Determination of silicone contents of leathers by ICP OES - Scanning electron microscopy micrographs of leathers samples En ligne : https://drive.google.com/file/d/1wNFJN8UG4CQqaiq2Nmjfrwx6NGnn1ByB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14421 [article]

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