Modification of faltiquored split by in-situ polymerization of n-butyl-methacrylate / Xu Weixing in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 2 (03-04/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 2 (03-04/2017) . - p. 72-77 Titre : Modification of faltiquored split by in-situ polymerization of n-butyl-methacrylate Type de document : texte imprimé Auteurs : Xu Weixing, Auteur ; Hui Zeng, Auteur ; Jianfei Zhou, Auteur ; Wang Ya-nan, Auteur ; Bi Shi, Auteur Année de publication : 2017 Article en page(s) : p. 72-77 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites Composites -- Propriétés mécaniques Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés mécaniques Hydrophobie Polyméthacrylate de butyle Pressage à chaud Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As a kind of by-product of leather manufacture, split generally exhibits weak mechanical strengths due to its loose weave structure of collagen fibres. The in-situ polymerization of acrylate monomers has proved to be an effective approach to reinforce the network structure of split in our previous work. However, the split has to be dehydrated by organic solvents so that hydrophobic monomers are able to penetrate into the fibre network and then polymerize in-situ. This process is complicated and may lead to the discharge of effluent containing organic solvents. In fact, traditional fatliquoring process imparts hydrophobicity to leather to some extent. In this study, chrome tanned split was firstly fatliquored and dried into trust. Then n-butyl-methacrylate(nBMA) was directly added into the crust split by drumming. After complete absorption of the monomer, Poly(n-butyl-methacrylate) (PnBMA)/split composite was easily prepared through hot pressing. The mechanical properties of the modified composite were measured to evaluate the reinforcing effect on split. The results suggested that the fatliquoring agents made of natural yolk provided the appropriate hydrophobicity for spin, and thus benefited the subsequent polymerization. The composite with the addition of 20% fatliquoring agent and 50% nBMA showed the best mechanical properties. Hot pressing conditions were optimized to be heated at 65°C for 60 minutes, The tensile strength and tear strength of the PnBMA/split composite prepared at optimum conditions are 37.25N/mm2 and 262.44N/mm, respectively. As a result, the reinforced split is expected to meet the requirement for producing most of leather products with high value-added. Note de contenu : - MATERIAL AND METHODS : Materials - Preparation of PnBMA/split composites with different dosages of nBMA - Preparation of PnBMA/split composites with different hot pressing conditions - Characterisation of compatability between fatliquoring agent and nBMA monomers - Measurements and instruments - RESULTS AND DISCUSSION : Effect of type and dosage of fatliquoring agents on mechanical properties of PnBMA/split composites - Effect of the dosage of nBMA on mechanical properties of PnBMA/split composites - Effect of heating process on mechanical properties of PnBMA/split composites En ligne : https://drive.google.com/file/d/1ZGlQqlFevQzSV_A_w76q60lBXEbBrY01/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28513 [article]

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Suitability of pore measurement methods for characterizing the hierarchical pore structure of leather / Xiu He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 2 (02/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 2 (02/2019) . - p. 41-47 Titre : Suitability of pore measurement methods for characterizing the hierarchical pore structure of leather Type de document : texte imprimé Auteurs : Xiu He, Auteur ; Wang Ya-nan, Auteur ; Jianfei Zhou, Auteur ; Haobo Wang, Auteur ; Wei Ding, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : p. 41-47 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cuirs et peaux -- Analyse Mesure Pore (anatomie) Ouverture imperceptible dans la peau de l’homme ou de l’animal, par où se fait la transpiration. (wiktionnaire) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Pore structure of leather plays an important role in leather-making process as well as in characterization of comprehensive properties of leather. In this study, scanning electron microscopy, mercury intrusion porosimetry (MIP), capillary flow porometry and nitrogen adsorption techniques were used for characterization of the hierarchical pore structure of leather. From the comparison, MIP was found to be more suitable for pore measurement of leather in consideration of its extensive measuring range (from 5.48 nm to 120 μm), high accuracy (measuring both through pores and blind pores in leather) and satisfactory repeatability (with RSD of 3.25% and 1.73% for average pore diameter and porosity, respectively). Then the MIP test conditions were optimized. The appropriate conditions were found to be that a leather sample (approx. 3 cm × 2 cm and 0.6 g) is used for determination with a stem volume around 50%. Blank correction is conducted in the measurement with the maximum pressure of 33000 psia and the equilibration time of 10 s. In general, the characterization of the hierarchical pore structure of leather by MIP is a meaningful aid to explore the relationship between structure and property of leather. Note de contenu : - EXPERIMENTAL : Materials - Preparation of leather samples - SEM analysis - MIP analysis - CFP analysis - Nitrogen adsorption analysis - Optimization of MIP test conditions for leather - RESULTS AND DISCUSSION : SEM analysis - Comparison of three pore measurement methods - Optimization of MIP test conditions for leather En ligne : https://drive.google.com/file/d/1G-t15UG4r2QbLT4DR05dBkonoAUN-kea/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31716 [article]

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