Biodegradability study of footwear soling materials in simulated compost environment / Moumita Mukherjee in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 2 (02/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 2 (02/2021) . - p. 58-68 Titre : Biodegradability study of footwear soling materials in simulated compost environment Type de document : texte imprimé Auteurs : Moumita Mukherjee, Auteur ; T. Loganathan, Auteur ; Sujata Mandal, Auteur ; G. Saraswathy, Auteur Année de publication : 2021 Article en page(s) : p. 58-68 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse morphologique Analyse thermique Caractérisation Compostage Cuirs et peaux -- Biodégradation Essais (technologie) Semelles Thermogravimétrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Aim of the present study is to investigate the biodegradability and decomposing properties of footwear soling materials by standard biodegradability test method. Biodegradability tests were performed by aerobic exposure of the selected six soling materials to the soil matrix and measuring the degradation and decomposition occurred with time. All soling materials were characterized for physical and physicochemical properties such as weight loss, hardness, density, tensile strength, abrasion resistance, thermal and morphological properties before and after exposing to the simulated compost environment. In the present study, the end-of-life nature of footwear soling materials currently used by the footwear industries are explored, which will further emphasize the importance of development and use of biodegradable materials in the footwear manufacturing. Note de contenu : - MATERIALS : Compost composition - METHOD - CHARACTERIZATION - RESULTS AND DISCUSSION : Physical properties - ATR-FTIR - Thermal analysis (TGA and DSC) - Morphological analysis DOI : https://doi.org/10.34314/jalca.v116i2.4236 En ligne : https://drive.google.com/file/d/1hGALbjVyBKtlnBf-tTq4WJSivbSx9XBY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35309 [article]

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Influence of polyurethane binders on the surface properties of finished leathers : Part 1 - Function as a sealing coat / Suriya Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 7 (07/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 7 (07/2024) . - p. 295-302 Titre : Influence of polyurethane binders on the surface properties of finished leathers : Part 1 - Function as a sealing coat Type de document : texte imprimé Auteurs : Suriya Madhan, Auteur ; R. Monica Denise, Auteur ; Sujata Mandal, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2024 Article en page(s) : p. 295-302 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Angle de contact 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 -- Finition Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux de bovins Energie de surface Essais dynamiques Etanchéité Liants Mesure Perméabilité Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Finishing is the final stage of the leather-making process, where the surface of the leather is enhanced to improve its durability, appearance, and texture. The sealing coat (used predominantly in corrected grain leathers for leather accessories and footwear industries) is the first step that forms the bottom layer of the leather finishing film before the base coat. The goal of the sealing coat is to keep the leather surface reactive and prevent the pigmented base coat from sinking completely into the grain of the leather. The chemicals used in the sealing coat provide the leather surface with a charge and condition (addition of oil/fat and/or polyurethane -PU) to ensure that the chemicals (pigments, binders, and other additives) used in the base coat of the finishing process are not completely absorbed into the grain layer of the crust leather. In the present study, the influence of PU as an additive to the sealing coat formulation was evaluated through measurement of surface properties, such as contact angle, surface energy, and work of adhesion. The values of the contact angle between the liquids (water/dimethyl sulfoxide/hexadecane) and the leather surface were used to evaluate the leather’s surface energy and work of adhesion. The water contact angle of the uncoated crust, cationic oil ground (COG)-coated crust, and COG-PU-coated crust was measured as 77.3, 93.6, and 109.0 degrees respectively. The increase in contact angle indicates an increase in the hydrophobicity of the leather’s surface on coating with COG and COG+PU. The surface energy component (γs) of the crust leather surface without coating, COG-coated, and COG-PU-coated leathers were 35.2, 28.3, and 24.8 m/Nm, while the work of adhesion of the above leathers for water were 88.8, 68.2, and 49.1 mJm-2, respectively. The experimental values indicated that PU plays an important role as an additive to the sealing coat and enhances the required properties in the finishing process for the desired final leather. Note de contenu : - EXPERIMENTAL SECTION : Materials - METHOD : Determination of contact angle - Measurement of work of adhesion and surface energy - Determination of wet and dry fastness - Determination of water-vapor permeability - Determination of physical strength characteristics - Measurement of adhesion of finish - Determination of organoleptic properties - RESULTS AND DISCUSSON : Contact angle and surface parameters of dyed crust, COG-coated and COG-PU-coated leather - Work of adhesion and surface energy of dyed crust, COG-coated leather, and COG-PU-coated leather - Relationship between work of achesion/surface energy and acidity/basicity of leathers coated with COG and COG-PU - Relationship between surface energy and polarity of leathers coated with COG and COG-PU - Water vapor permeability - The influence of COG and COG-PU coat on the physical organoleptic properties of finished leathers - Table 1 : Process of wet blue to black crust from cow hides - Table 2 : Process of sealing coat - Table 3 : Process of PU-sealing coat - Table 4 : Process of base and top coat after sealing/PU sealing coat - Table 5 : Contact angle, surface energy (ysv), acidity, basicity, polarity, work of adhesion (Wa) of dyed crust, COG-coated, and COG-PU-coated leathers - Table 6 : Finish adhesion, fastness to rub, and elongatio at break of dyed crust, COG-coated and COG-PU-coated leather - Table 7 : Organoleptic properties of the dyed crust, COG-coated and COG-PU-coated leather DOI : https://doi.org/10.34314/wdwj1p18 En ligne : https://drive.google.com/file/d/1J-_XLaKaV9az3xQYOPmWX42gVhsR-1lP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41283 [article]

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A novel approach for enhanced color intensity and uniformity in leather dyeing / Sujata Mandal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 6 (06/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 6 (06/2018) . - p. 176-182 Titre : A novel approach for enhanced color intensity and uniformity in leather dyeing Type de document : texte imprimé Auteurs : Sujata Mandal, Auteur ; Jayanthi Durga, Auteur ; G. Jothi, Auteur ; Malathy Jawahar, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2018 Article en page(s) : p. 176-182 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Cuirs et peaux -- Teinture Photostabilité Résistance à l'abrasion Résistance à la transpiration Résistance aux frottements humides Solidité de la couleur Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Dyeing is a significant process step in leather making that is carried out to enhance the aesthetics of the tanned hides and skins. Due to the heterogeneous nature of the skin matrix, obtaining leathers with consistent color is challenging. The present study describes application of hydrotalcite-like inorganic synthetic material (HTLM) during leather dyeing to bring color uniformity among leathers by maximizing the color intensity within the skin and among the skins processed in a batch. The HTLM has been used in an interim step between two phases of dyeing that enhanced shade intensity as well as color consistency through modification of the leather surface chemically. The efficacy of the HTLM for enhanced color intensity and uniformity in leather has been investigated. Influence of the HTLM on the physicals characteristics like, perspiration, color fastness to light and dry/wet rub are also studied. Note de contenu : - Materials - Methods - Color fastness testing. Fastness to dry and wet rub - Fastness to light - Perspiration - Spectroscopic assessment of color intensity and uniformity - Characterization of the HTLM En ligne : https://drive.google.com/file/d/1CDZaPfJCQjnefo3Te9Sro4NC9GcEbmFv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30686 [article]

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Root cause analysis of color migration in footwear : A case study / Sujata Mandal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 4 (04/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 4 (04/2023) . - p. 150-155 Titre : Root cause analysis of color migration in footwear : A case study Type de document : texte imprimé Auteurs : Sujata Mandal, Auteur ; Ravi Banothu, Auteur ; R. Mohan, Auteur ; Kalarical Janardhanan Sreeram, Auteur Année de publication : 2023 Article en page(s) : p. 150-155 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs en phase solvant Caractérisation Chaussures Cuir teint Décoloration Défauts Essais (technologie) Frottements (mécanique) Produits chimiques -- Migration Solidité de la couleur Tige de la chaussure Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The phenomena of migration and/or bleeding of colorants are one of the major concerns for the footwear and leather goods industries. The migration/bleeding of the colorants from one component to the other has been observed in many cases that spoil the aesthetics of the product, which in turn leads to economic loss for the industries. In this research article, a typical case of color migration in leather footwear has been studied in depth for root-cause analysis of the migration problem. The leather used in the shoe upper (affected due to migration), the lining fabric, and the adhesive used in making the footwear were characterized by microscopic and spectroscopic techniques. The FTIR-ATR study revealed that the leather was finished with polyurethane-based coating, the lining fabric used was an aromatic polyester and the adhesive was natural rubber-based adhesive. Though the lining fabric was colorfast to rubbing, it released color in all the organic solvents generally used in natural rubber-based adhesive. Migration studies showed that migration of the colorant (black) from the lining material to the leather (white) happened only in the presence of the adhesive. In conclusion, the organic solvent present in the adhesive used in making the footwear was responsible for the color migration from the lining material to the attached leather. Finally, recommendations have also been made to avoid such problems of color migration in products made from a variety of multiple fabrics. Note de contenu : - EXPERIMENTAL : Materials - Characterization techniques - RESULTS AND DISCUSSION : Microscopic and FTIR-ATR study - Color fastness to rubbing of the lining fabric - Color migration/bleeding tests of the lining fabric - Table 1 : Values of grey cale rating for the lining and the standard cotton lawn DOI : https://doi.org/10.34314/jalca.v118i4.7205 En ligne : https://drive.google.com/file/d/1GNsWjuOMrNz-6bJkjGVZddPuLqDdKG9f/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39183 [article]

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Sustainable finished leather preservation / Ruby Shekinah in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 2 (02/2024) . - p. 55-63 Titre : Sustainable finished leather preservation : Part I - Myrobalan capped copper nanoparticles Type de document : texte imprimé Auteurs : Ruby Shekinah, Auteur ; Saranya Kailasam, Auteur ; Sujata Mandal, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2024 Article en page(s) : p. 55-63 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Cuirs et peaux -- Conservation Cuirs et peaux -- Finition Cuivre Formulation (Génie chimique) Myrobalan et constituants Nanoparticules Nanoparticules -- Synthèse Produits de conservation du cuir Réduction (chimie) Revêtements Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Copper nanoparticles were synthesized using myrobalan (tannin) extract as a reducing agent. The synthesized nanoparticles were used in the coating of leather after the finishing process of upper leather to enhance the antimicrobial properties of leather. Primarily, the synthesized myrobalan copper nanoparticles (M-CuNPs) were characterized using UV-Spectroscopy (UV), which resulted in an absorption peak at 412 nm, confirming the presence of CuNPs in the solution. The size distribution and zeta potential values of M-CuNPs were analyzed by Dynamic Light Scattering (DLS) which resulted in an average particle size of 104 nm and zeta potential value of -28mv. These values affirm the stability of the M-CuNPs. Scanning Electron Microscope (SEM) image showed that the particles are spherical in shape. The elemental composition of M-CuNPs was confirmed using Energy dispersive X-ray (EDX) studies. Fourier transform infrared (FTIR) spectra showed peaks at 3173 cm-1, 1727 cm-1, 1147 cm-1, and 624 cm-1, which correspond to -OH, C=O, C-O, and C-H respectively confirming functional groups involved in the synthesis and capping process. The antibacterial activity of the M-CuNPs coated finished leather was evaluated against Grampositive (Bacillus subtilis) and Gram-negative (Serratia marcescens) bacteria, which are common pathogenic species that effect the preservation capabilities of the leather. The M-CuNPs coated finished leather exhibits strong antimicrobial activity against both Gram-positive (Bacillus subtilis) and Gram-negative (Serratia marcescens) bacteria. Hence from the above study, M-CuNPs can be used as a sustainable antibacterial agent for preserving leather and its products. Note de contenu : - MATERIALS AND METHOD : Materials - Preparation of tannin extraction - Synthesis of M-CuNPs - Characteristics of M-CuNPs - Methodology of leather nanocoatings - Antibacteial assay of M-CuNPs - Effect of copper nanoparticles on growth of bacteria - Antibacterial evaluation of M-CuNPs coated leather - RESULTS AND DISCUSSION : Antibacterial activity of M-CuNPs - Antibacterial mechanism of copper nanoparticles - Table 1 : Resin finish formulation - Table 2 : Antibacterial activity of the synthesized M-CuNPs DOI : https://doi.org/10.34314/jalca.v119i2.8322 En ligne : https://drive.google.com/file/d/1Sj4vOJh9ztiOGhfz1DgCXCot8I0WENEA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40465 [article]

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Sustainable finished leather preservation / Ruby Shekinah in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)  

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