Hyperbranched-linear polymers as promising leather additives / Wang Xuechuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 1 (01-02/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 1 (01-02/2017) . - p. 6-9 Titre : Hyperbranched-linear polymers as promising leather additives Type de document : texte imprimé Auteurs : Wang Xuechuan, Auteur ; Lu Weina, Auteur ; Li Yang, Auteur ; Wang Haijun, Auteur Année de publication : 2017 Article en page(s) : p. 6-9 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Additifs Caractérisation Cuirs et peaux -- Propriétés mécaniques Groupe hydroxyle Polyesters Polymères -- Synthèse Polymères ramifiés Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A series of coconut oil-based hydroxyl-terminated hyperbranched-linear polyesters of generations 1-3 (CHBPs) were synthesized using a one-pot method and utilized in leather making. The effect of hyperbranched polymers on collagen fibres was discussed by comparing with linear products at macro level. The experimental results showed that hyperbranched polymers are less lubricating than linear compounds but have more filling abilities. Thickening rates of the leather treated by CHBPs decreased with growing generations due to their hydroxyl groups external to the molecule which will cross-link collagen fibres. In addition, CHBPs at higher generations can shrink location difference sharply. Unluckily, except for CHBP, other products didn't improve the mechanical properties of the leather remarkably. Still, hyperbranched polymers showed great potential application in the leather industry. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of coconut oil-based hyperbranched polyesters (CHBPs) - Fatliquor process - Characterisation - RESULTS AND DISCUSSION : Synthesis of CHBPs - Filing properties - Solftness properties - Mechanical properties En ligne : https://drive.google.com/file/d/13rfI0LehgtbJN0f0dUMxRZGbzRGbruPM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27935 [article]

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Nonparametric bootstrap method for estimating the upper confidence limits of exposure point concentrations of formaldehyde in fur products - A case study of tongxiang city, China / Yuan Xuzheng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 11 (11/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 11 (11/2017) . - p. 387-394 Titre : Nonparametric bootstrap method for estimating the upper confidence limits of exposure point concentrations of formaldehyde in fur products - A case study of tongxiang city, China Type de document : texte imprimé Auteurs : Yuan Xuzheng, Auteur ; Wang Xuechuan, Auteur ; Lu Weina, Auteur ; Jiang Sujie, Auteur Année de publication : 2017 Article en page(s) : p. 387-394 Note générale : Bibliogr Langues : Américain (ame) Catégories : Fourrures -- Analyse Fourrures -- Teneur en formaldehyde Mesure -- Méthodes statistiques Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The distribution characteristics of the formaldehyde (FA) content of fur products produced in Tongxiang City over three consecutive years (2014-2016) were analyzed by the Lilliefors test, quarterback robust statistical method, and kernel density estimation. The bootstrap simulation sampling method was used to calculate the upper confidence limits (UCL) of the exposure point concentration (EPC) of FA. The robustness and rationality of the UCL estimation were verified by the distribution of the mean value of each bootstrap sample dataset. The results showed that their distributions were close to normal distribution but were highly skewed. The one-sided 95% UCL on the mean were 95.45 mg/kg, 93.02 mg/kg and 86.64 mg/kg, which decreased year by year. The Wilcoxon rank sum test indicated that the population distribution of the FA content in 2016 showed a structural improvement over those of the previous two years. Note de contenu : - SAMPLE SOURCES AND METHODS : Case study area : tongxiang city - Samples sources - Method for determination of FA - Data processing method for samples below the LOD - Polymorphic analysis of FA content for every year - Estimation UCL for EPC of FA for every year - Pairwise comparison of FA content by wilcoxon rank sum test - RESULTS AND DISCUSSION : Data processing method for samples below the LOD - Descriptive statistical analysis of the FA content in fur products - Symmetry analysis of distribution of FA content in fur products - Computing UCL and programmed by MATLAB - UCL values and robustness verification - Pairwise comparison of FA content by the wilcoxon rand sum test En ligne : https://drive.google.com/file/d/1d_Ldj-bt-EwIaewoBJT4Ha4OWKF6Yxxp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29397 [article]

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Research on formaldehycle emission characteristics of leather with porous structure by sealed jar method / Yuan Xuzheng in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 6 (11-12/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 6 (11-12/2017) . - p. 284-289 Titre : Research on formaldehycle emission characteristics of leather with porous structure by sealed jar method Type de document : texte imprimé Auteurs : Yuan Xuzheng, Auteur ; Wang Xuechuan, Auteur ; Lu Weina, Auteur ; Jiang Sujie, Auteur Année de publication : 2017 Article en page(s) : p. 284-289 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie en phase liquide à hautes performances Cuirs et peaux -- Analyse Cuirs et peaux -- Effets de la température Emission de polluants Formaldéhyde Matériaux poreux Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Formaldehyde release tests of leather with porous structures were carried out according to ISO 17226-3 standard-sealed jar method. Effects of temperature on the release behaviour were investigated. The formaldehyde emission model in sealed system was established according to the law of mass transfer under several reasonable assumptions and verified by the fitting of actual release data. The results showed that formaldehyde emission could be divided into three stages : the linear free release, barrier release and chemical release stages. The linear release .time inversely correlated with mass transfer coefficient of leather. The temperature had a significant promotion impact on release during linear release time. The higher the temperature was, the faster the formaldehyde release. Different types of leather showed different release characteristics because of porosity. The average release speed for sheepskin was faster than that of cowhide at the same temperature. However, with the increase of temperature, the increase in the rate of release speed of cowhide was greater. From 30°C to 60°C, the speed for sheepskin increased 19.39% for every increase of 1 degree Celsius by average, and that of cowhide increased 29.92%. Note de contenu : - EXPERIMENTAL SECTION : Materials - Pretreatment of leather samples - Procedure for the determination of formaldehyde emission by the HPLC method - Determination of porosity of leather by carbon tetrachloride permeation method - SEM observation - Effect of temperature on release behaviour - Release kinetics of leather - RESULTS AND DISCUSSION : Results of the porosity of leather - SEM images of leather cross section - Effect of temperature on formaldehyde emission - Theoretical assumptions of the release model and derivation of release equations - Collection and fitting of actual release data En ligne : https://drive.google.com/file/d/1fKSsaEFWV3nSAOt2XPelqnVLEZ_DWo6I/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29666 [article]

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