Preparation and characterization of a stable core-shell latex with VAE in the core / Shi Luo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 9 (09/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 9 (09/2012) . - p. 286-291 Titre : Preparation and characterization of a stable core-shell latex with VAE in the core Type de document : texte imprimé Auteurs : Shi Luo, Auteur ; Bailing Liu, Auteur Année de publication : 2012 Article en page(s) : p. 286-291 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylate de butyle Caractérisation Copolymère éthylène acétate de vinyle Core-Shell Fourier, Spectroscopie infrarouge à transformée de Latex Lumière -- Diffusion Microscopie électronique en transmission Persulfate d'ammonium Polymérisation en émulsion Styrène Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A core-shell latex containing Butyl Acrylate (BA) and Styrene (St) in shell, and Vinyl Acetate-Ethylene (VAE) in core was successfully prepared by seeded emulsion polymerization with water as the reaction medium. Several key elements related to the polymerization, including core/shell ratio, BA/St ratio and Ammonium persulfate (APS) dosages were investigated in details. Accordingly, an optimal reaction condition was developed. The synthesized l,atex particles were characterized by Transmission electron microscopy (TEM) and Dynamic light scattering (DLS). The clear core-shell structure and chemical components of the core-shell latex particles were determined by TEM and Fourier transform infrared (FTIR) spectrometry, respectively. In addition, the comparisons between the core-shell latex and VAE latex were made. The experimental results indicated that the developed core-shell latex produced improved leather related properties for thermal stability, water resistance and adhesion. Note de contenu : - MATERIALS - SEEDED EMULSION POLYMERIZATION - CHARACTERIZATION : Solid content and conversion - Stability of the emulsion - Water absorption ratio - Thermogravimetric analysis - Adhesive strength - Infrared spectra - Particle size and morphology - SYNTHESIS CONDITIONS OF THE CORE/SHELL : Core/shell ratio - BA/St ratio - APS dosage - FTIR SPECTRA - LATEX PARTICLE MORPHOLOGY OF CORE-SHELL EMULSION - THERMAL STABILITY ANALYSIS - WATER ABSORPTION OF EMULSION FILMS - ADHESION PERFORMANCE OF EMULSIONS - TABLE I : Recipes for the preparation of core-shell (BA-St-VAE) by seeded emulsion polymerization with various core/shell ratio - TABLE II : Recipes for the preparation of core-shell (BA-St-VAE) by seeded emulsion polymerization with various BA/St ratio - TABLE III : Recipes for the preparation of core-shell (BA-St-VAE) by seeded emulsion polymerization with various content of APS - TABLE IV : The latex stability with various core/shell ratio - TABLE V : The emulsion stability with various BA/St ratio - TABLE VI : The latex stability and polymerization conversion with various APS dosage - TABLE VII : The water absorption ratio and contact angle of latex films - TABLE VIII : The adhesive strength of emulsions En ligne : https://drive.google.com/file/d/1pzeVlxUmYVjPxtCANlg-jhi6qjpX1U-T/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16059 [article]

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The relationship between the structure of hyper-branched polymer and its effect on high exhaust chrome in reduced chrome tanning / Yao Qi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 5 (05/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 5 (05/2017) . - p. 153-161 Titre : The relationship between the structure of hyper-branched polymer and its effect on high exhaust chrome in reduced chrome tanning Type de document : texte imprimé Auteurs : Yao Qi, Auteur ; Chenying Li, Auteur ; Henghui Huang, Auteur ; Hualin Chen, Auteur ; Bailing Liu, Auteur Année de publication : 2017 Article en page(s) : p. 153-161 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chrome trivalent -- Absorption Cuirs et peaux -- Analyse Groupement carboxyle Oligomères Poids moléculaires Polydispersité Polymères -- Synthèse Polymères ramifiés Tannage au chrome Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Hyper-branched polymer (HBP) has been widely used as pretanning, tanning auxiliary and retanning agent in chrome tanning industry. However the effect of the structure of HBP including the degree of branching (DB) and molecular weight (Mw), on chrome tanning has seldom been studied. In this study a series of carboxyl-terminated hyper-branched oligomer (HBP) with different DB and Mw have been prepared and characterized by GPC and 1H-NMR for determining their molecular weight and its distribution, as well the DB. The effect of DB and Mw on the chrome uptake and shrinkage temperature (Ts) of hide was investigated. Experimental results showed that the chrome uptake was affected by both DB and Mw of developed HBP. HBP that possesses high DB and the Mw closed to 2000 Da, has endowed the obtained leather with higher Ts and chrome uptake. Moreover, the leather tanned with 3% chrome and 1.5% HBP possesses similar properties to the traditional tanning process using 6-8% chrome. Therefore, the carboxyl-terminated HBP presents a potential application as a tanning auxiliary in reduced chrome tanning due to it’s improving the absorption of chrome. Note de contenu : - MATERIALS AND METHODS : Chemicals and materials - Synthesis of the carboxyl-terminated hyper-branched oligomer - Chrome tanning - INSTRUMENTS AND MEASUREMENTS : Gel permeation chromatography (GPC) - Differential scanning calorimetry (DSC) - FT-IR spectra - H NMR - The acid value - Shrinkage temperature - Chrome uptake - Charactereization of HBP-x - FTIR of the HBP-1 - HNMR of the HBP-1 - Estimation of the DB - Molecular weights and polydispersity - Chrome uptake - Effect of DB on the chrome uptake - Effect of Mw on the chrome uptake - Reduced tanning with HBP En ligne : https://drive.google.com/file/d/1E-yNeSRgfe2iItWez_p55B8SmbCRWwzG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28551 [article]

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