Nonionic short-chain fluorinated surfactants in the fatliquoring of chrome-tanned goat skin / Yichao Shen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 7 (07/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 7 (07/2020) . - p. 255-262 Titre : Nonionic short-chain fluorinated surfactants in the fatliquoring of chrome-tanned goat skin Type de document : texte imprimé Auteurs : Yichao Shen, Auteur ; Yong Jin, Auteur ; Shuangquan Lai, Auteur ; Liangjie Shi, Auteur ; Yutang Zhou, Auteur ; Rong Zhou, Auteur Année de publication : 2020 Article en page(s) : p. 255-262 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Caractérisation Chromatographie sur gel Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de chèvres Douceur (toucher) Fourier, Spectroscopie infrarouge à transformée de Liqueurs de tannage Microscopie électronique à balayage Surfactants fluorés Tannage au chrome Tension superficielle Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Surfactants as essential auxiliaries are used in almost all chemical processes in leather production. In this work, a series of nonionic short-chain fluorinated surfactants (Fn-Fn, where n = 2, 4, or 6) were successfully prepared and used as fatliquoring auxiliaries in the fatliquoring process of chrome-tanned goat skin. The chemical structure of these nonionic short-chain fluorinated surfactants was characterized by FTIR and the molecular weight was determined by GPC. The surface tension measurement results revealed that these three fluorinated surfactants showed excellent surface activities. The effect of type and dosage of Fn-Fn as well as fatliquoring temperature on fatliquoring properties of chrome-tanned goat skin were estimated by the softness and physical mechanical properties characteristic of resultant leather. The results revealed that the leather treated with 1 wt% F4-F4 at the fatliquoring temperature of 40oC showed the best overall performance, whose softness and physical mechanical properties were improved significantly. Moreover, the collagen fiber morphology and waterproof performance of leather treated with Fn-Fn were also investigated which showed that the addition of Fn-Fn in the fatliquoring process could promote the loosening of collagen fibers while effectively enhancing the water repellency of the leather surface. Therefore, such types of nonionic short-chain fluorinated surfactants are promising to be as desired fatliquoring auxiliaries in the leather industry. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of nonionic short-chain fluorinated surfactants (Fn-Fn) - Fourier Transform Infrared Spectra (FTIR) - Gel permeation chromatography (GPC) - Surface tension measurement - Application of nonionic short-chain fluorinated surfactants - Analysis of leather properties - RESULTS AND DISCUSSION : Synthesis and characterization of nonionic short-chain fluorinated surfactants (Fn-Fn) - Surface properties - Effect of type of Fn-Fn on the softness and physical mechanical properties of leather - Effect of dosage of Fn-Fn on the softness and physical mechanical properties of leather - Effect of fatliquoring temperature on softness and physical mechanical properties - SEM analysis of leather - Contact angle DOI : https://doi.org/10.34314/jalca.v115i7.3833 En ligne : https://drive.google.com/file/d/1jWVv4Z3q7D9OPMovPW4gKqVpNEXR8J3d/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34327 [article]

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Nonionic short fluorocarbon chain surfactants for improving application properties of acrylic resin in the retanning of wet-blue leather / Rong Zhou in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 11 (11/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 11 (11/2022) . - p. 455-464 Titre : Nonionic short fluorocarbon chain surfactants for improving application properties of acrylic resin in the retanning of wet-blue leather Type de document : texte imprimé Auteurs : Rong Zhou, Auteur ; Yong Jin, Auteur ; Shuangquan Lai, Auteur ; Liangjie Shi, Auteur ; Yutang Zhou, Auteur ; Zhangyi Peng, Auteur Année de publication : 2022 Article en page(s) : p. 455-464 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants -- Adsorption Cuirs et peaux de chèvres Polyacryliques Retannage Surfactants Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Acrylic resin (AR) is one of the most commonly used leather retanning agents owing to its excellent selective filling property and low cost. However, there are some defects affecting the quality of wet-blue leather in the practical application of AR, such as “excessive convergence”, “detanning”, and “fading”. Herein, the nonionic short fluorocarbon chain surfactants (F6-m) combined with AR for retanning wet-blue goat leather to further improve the application properties of AR. In a series of comparative experiments, the grain surface state and mechanical properties of leather retanned with 4 wt% AR and 2wt% F6-400 are preferred. Moreover, after dyeing, the dye adsorption rate and a* (red-greenness) value of AR/F6-400 retanned leather are higher than that of leather retanned with AR alone. The above issues reveal that F6-400 can improve application properties of AR in the retanning of wet-blue leather to a certain extent, benefiting to further upgrade the quality of leather. Note de contenu : - MATERIALS AND METHODS : Materials - Leather processing - Analysis of leather properties - Morphology - Dye adsorption rate - Color difference analysis - RESULTS AND DISCUSSION : Effects of different retanning systems on leather properties - Effect of the dosage of AR on leather properties - Effect of the dosage of F6-400 on leather properties - Morphology analysis of grain surfaces - Morphology analysis of cross sectin - Dyeing - Table 1 : Process recipe for leather manufacture - Table 2 : Organoleptic properties of Control (C) and Experimental (E) leathers retanned with different retanning systems at total dosage of 4 wt% - Table 3 : Organoleptic properties of leathers retanned with different doasages of 1R and 2 wt% F6-400 - Table 4 : Organoleptic properties of leathers retanned with different dosages of F6-400 and 4 wt% AR - Table 5 : Chroma color difference values of dyed leather DOI : https://doi.org/10.34314/jalca.v117i11.6292 En ligne : https://drive.google.com/file/d/1L4x2PhD01Q9znu2rfshXE86t56N7PsQk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38339 [article]

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Strong synergistic effect of cationic hydrocarbon surfactant and novel nonionic tri-block short-chain fluorocarbon surfactant mixtures on surface activity, wettability and solubilization / Yutang Zhou in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 15 p. Titre : Strong synergistic effect of cationic hydrocarbon surfactant and novel nonionic tri-block short-chain fluorocarbon surfactant mixtures on surface activity, wettability and solubilization Type de document : texte imprimé Auteurs : Yutang Zhou, Auteur ; Yong Jin, Auteur ; Yichao Shen, Auteur ; Liangjie Shi, Auteur ; Shuangquan Lai, Auteur ; Yujia Tang, Auteur Année de publication : 2021 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Angle de contact Chimie des surfaces Colloides -- Stabilité Colorants Mélanges (chimie) Micelles Mouillabilité Polytétrafluoréthylène Solubilisation Surfactants Tension superficielle Thermochimie Transmittance La transmittance, en général, est le rapport caractérisant la transmission d'une grandeur dans un système. Elle se calcule par le rapport entre la grandeur en entrée et en sortie. En optique, la transmittance d'un matériau ou d'un filtre est la fraction du flux lumineux le traversant. Elle est également nommée facteur de transmission mais aussi transparence dans le domaine de la photographie. Index. décimale : 541.33 Chimie physique - Chimie des surfaces (Phénomènes superficiels) Résumé : Mixing hydrocarbon surfactants with fluorocarbon surfactants is still an important strategy to improve the economic benefits and performances of fluorocarbon surfactants and expand their range of application. Herein, we prepared a novel kind of hydrocarbon-fluorocarbon surfactant mixtures via mixing a cationic surfactant, cetyltrimethylammonium bromide (CTAB), with a tri-block nonionic short-chain fluorocarbon surfactant (F9EG13F9) in aqueous solution. The results showed that adding a small CTAB amount to F9EG13F9 (the molar fraction of CTAB in the mixture (x1) was 0.2) could greatly reduce its critical micelle concentrations (cmc) from 0.408 mmol/L to 0.191 mmol/L. At this x1, the contact angle of the mixture was the minimum (57.7 °) at 100 s on polytetrafluoroethylene film, which was even lower than that of F9EG13F9. Besides, CTAB/F9EG13F9 mixtures possessed better colloidal stability and solubilization ability toward hydrophobic dye (Sudan І) than F9EG13F9. The outstanding performances of binary surfactant mixtures benefited from the non-ideal mixing and strong synergistic effect evidence that CTAB/F9EG13F9 surfactant mixtures could be used in practical applications instead of individual F9EG13F9, thereby reducing the used cost of F9EG13F9. Note de contenu : - MATERIALS AND METHODS : Materials - Surface tension measurements - Conductivity measurements - Contact angle measurements - Transmittance measurements - Solubilization of hydrophobic dye - RESULTS AND DISCUSSION : Micellization behavior of binary mixtures - Adsorption behavior of binary mixtures - Thermodynamics of binary mixtures - Wettability of binary mixtures - Colloidal stability of binary mixtures - Solubilization of hydrophobic dye - Table 1 : Values of cmc and micellization parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C - Table 2 : Critical surface tension and adsorption parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C - Table 3 : Thermodynamic parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C - Table 4 : Solubilization parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C DOI : https://doi.org/10.1186/s42825-021-00064-1 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00064-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37547 [article]

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Synthesis and application of non-bioaccumulable fluorinated surfactants : a review / Rong Zhou in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 15 p. Titre : Synthesis and application of non-bioaccumulable fluorinated surfactants : a review Type de document : texte imprimé Auteurs : Rong Zhou, Auteur ; Yong Jin, Auteur ; Yichao Shen, Auteur ; Peng Zhao, Auteur ; Yutang Zhou, Auteur Année de publication : 2021 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcènes Maroquinerie Molécules non bioaccumulables Polymérisation en émulsion Protéines Relations structure-activité Surfactants -- Synthèse Surfactants fluorés Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Due to negative effects of conventional fluorinated surfactants with long perfluorocarbon chain (CxF2x+ 1, x≥7) like perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS), these conventional long perfluorocarbon chain surfactants have been restricted in many industrial applications. Nowadays, their potential non-bioaccumulable alternatives have been developed to meet the requirements of environmental sustainable development. In this paper, the recent advances of potential non-bioaccumulable fluorinated surfactants with different fluorocarbon chain structures, including the short perfluorocarbon chain, the branched fluorocarbon chain, and the fluorocarbon chain with weak points, are reviewed from the aspects of synthesis processes, properties, and structure-activity relationships. And their applications in emulsion polymerization of fluorinated olefins, handling membrane proteins, and leather manufacture also are summarized. Furthermore, the challenges embedded in the current non-bioaccumulable fluorinated surfactants are also highlighted and discussed with the hope to provide a valuable reference for the prosperous development of fluorinated surfactants. Note de contenu : - SYNTHESIS OF NON-BIOACCUMULABLE FLUORINATED SURFACTANTS : Surfactants with short perfluorocarbon chain - Surfactants with weak points on fluorocarbon chain - Surfactants with branched fluorocarbon chain APPLICATION OF NON-BIOACCUMULABLE FLUORINATED SURFACTANTS : Application in emulsion polymerization of fluorinated olefins - Application in handling membrane proteins - Application in leather manufacture - Table 1 : CMC and γCMC of some perfluorooctyl surfactants - Table 2 : Serum elimination half-lives of some fluorinated surfactants (KPFOS, PFOA, perfluoroheptanoic acid (PFHA), perfluorohexanoic acid (PFHxA), potassium perfluorobutylsulfonate (KPFBS), ammonium 2,3,3,3-tetrafluoro-2-(heptafluoropropoxy) propanoate acid (GenX) and ammonium 4,8-dioxa-3H-perfluorononanoate (ADONA)) in female (F) and male (M) rats, monkeys and humans - Table 3 : Surface tensions (mN/m) of fluorinated pyridinium and ammonium cationic surfactants in deionized water at 23 °C DOI : https://doi.org/10.1186/s42825-020-00048-7 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00048-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37467 [article]

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