Enhancement of mechanical and thermal insulation properties of polyvinyl chloride foam using leather shavings / Chao Lei in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 6 (06/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 6 (06/2024) Titre : Enhancement of mechanical and thermal insulation properties of polyvinyl chloride foam using leather shavings Type de document : texte imprimé Auteurs : Chao Lei, Auteur ; Xu Weixing, Auteur ; Bi Shi, Auteur ; Yunhang Zeng, Auteur Année de publication : 2024 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Charges (matériaux) Chlorure de polyvinyle Cuirs et peaux -- Déchets -- Recyclage Essais de résilience Essais dynamiques Isolation thermique Mousses plastiques Mousses plastiques -- Propriétés mécaniques Rhéologie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The global production of leather shavings (LSs) amounts to millions of tons annually, posing significant challenges in terms of resource waste and environmental pollution if not effectively managed. This study explores the utilization of LSs by fabricating modified leather fibers (MLFs) as reinforcing fillers to enhance the mechanical and thermal insulation properties of polyvinyl chloride (PVC) foams. The process involved pulverizing LSs and modifying them with a polyethylene glycol–isophorone diisocyanate (PEG–IPDI) prepolymer to create MLF. This MLF was then incorporated into PVC to produce MLF/PVC foam. The PEG–IPDI prepolymer modification aligned the surface free energy of MLF (33.82 ± 1.97 mJ/m2) with that of PVC (31.08 ± 3.65 mJ/m2), thereby improving their interfacial compatibility and imparting thermal energy storage capacity to the MLF. The resulting MLF/PVC foam exhibited enhancements in compressive strength and modulus, showing increases of 93.7% and 165.8%, respectively, compared to pure PVC foam. Furthermore, MLF/PVC foam demonstrated a slower surface temperature increase when heated using a heating plate at 110°C compared to pure PVC foam. These findings indicate that MLF enhances the mechanical and thermal insulation properties of PVC foams, primarily due to the improved foaming and thermal storage capacities imparted by the MLF. Note de contenu : - EXPERIMENTAL : Materials - Preparation of MLF - Preparation of PVC-based composite foams - Analyses of morphology and chemical structure - Analysis of rheological behavior - Analysis of foaming capacity - Testing of compressive properties - Analysis of thermal energy storage capacity - Testing of thermal insulation property - RESULTS AND DISCUSSION : Structure and properties of MLF - Interfacial structure of MLF/PVC - Rheological behavior of MLF/PVC - Foaming capacity of MLF/PVC - Mechanical properties of MLF/PVC foam - Thermal energy storage capacity of MLF/PVC foam - Thermal insulation properties of MLF/PVC foam - Table 1 : Formulation of pure PVC and composite foams - Table 2 : Thermal performance parameters of fillers and foams DOI : https://doi.org/10.34314/syc1sb89 En ligne : https://drive.google.com/file/d/1VkmDNoHTu43WmMgf6eTJ34uTVdIWI9Za/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40988 [article]

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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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The reinforcement of leather split by constructing an interpenetrating network via in-situ recombination of PVA / Xu Weixing in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 8 (08/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 8 (08/2018) . - p. 255-263 Titre : The reinforcement of leather split by constructing an interpenetrating network via in-situ recombination of PVA Type de document : texte imprimé Auteurs : Xu Weixing, Auteur ; Hui Zeng, Auteur ; Jianfei Zhou, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 255-263 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Composites -- Propriétés mécaniques Composites -- Propriétés thermiques Cuirs et peaux Matériaux -- Renforcement Polyacétate de vinyle Polymères -- Propriétés mécaniques Potentiométrie Réseaux polymères Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In order to improve the quality and utilization of leather split, the strength of leather split should be enhanced. The in-situ polymerization of some monomers has proven to be an effective approach in constructing an interpenetrating network (IPN) in split and increasing its strength. But this method is almost unacceptable in practice because of the use of volatile monomers and organic solvents. In this study, a new method to construct the IPN structure in split, in-situ recombination, was developed. Polyvinyl alcohol (PVA) was used as compositing agent, and its molecular structure and modification conditions were optimized. Scanning electron microscope (SEM), potentiometric analyzer and differential scanning calorimeter (DSC) were used to characterize the mechanism of in-situ recombination. The results suggested that PVA with an average polymerization degree of 500 and an average alcoholysis degree of 88% could enhance the strength of split most effectively through compositing reaction of PVA and split in 5% PVA aqueous solution for 120 min under 80°C and pH 7.0. The IPN structure was successfully constructed between PVA and collagen fibers via in-situ recombination. A method to enhance the strengths of leather split with practical application was established. Note de contenu : - EXPERIMENTAL : Materials and equipment - Preparation of PVA/split composites - Measurements and instruments - RESULTS AND DISCUSSION : Effect of compositing time on mechanical properties of PVA/split composites - Effect of polymerization degree and alcoholysis degree of PVA on mechanical properties of PVA/split composites - Effect of PVA concentration on mechanical properties of PVA/split composites - Morphology analysis of PVA/split composite - Potentiometric analysis of PVA/split composite - Thermal behavior of PVA/split composite En ligne : https://drive.google.com/file/d/1k-il4rNBlYeS-mLyrSM8DIC2KCqz1VkM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30842 [article]

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