Dépouillements

Preparation and properties of polyurethane finishing agent using butylamine as chain-extension agent / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 9 (09/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 9 (09/2009) . - p. 295-301 Titre : Preparation and properties of polyurethane finishing agent using butylamine as chain-extension agent Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Bing Zhu, Auteur ; Xuejing Zheng, Auteur ; Dennis C. Shelly, Auteur Année de publication : 2009 Article en page(s) : p. 295-301 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Allongement à la rupture Butylamine Cuirs et peaux -- Finition Cuirs et peaux -- Propriétés mécaniques Humidité -- Absorption Polyuréthanes Résistance à l'humidité Transition vitreuse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : With isophorone diisocyanate (IPDI), polytetrahydrofuran (PTMG), and dimethylolpropanoic acid (DMPA) as monomers, aqueous polyurethane finishing agents were synthesized. Butylamine, ethylene glycol and ethylene diamine were used as chain-extension agents. The aqueous polyurethane finishing agents were dried to yield polyurethane films (PU films). Mechanical properties of the films were studied. Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and water absorption were employed to characterize the structure and behaviors of the polyurethane films. Properties of the films obtained by different chain-extension agents were compared. Results show that the properties of the butylamine chain-extended film are better than those of the films chain-extended by either ethylene glycol or ethylene diamine. The elongation at break was the highest, 1454%. The glass transition temperature (Tg) reached -82°C and the water resistance was also better. Note de contenu : - EXPERIMENTAL : Materials and apparatus - Synthesis of aqueous polyurethane finishing agents - Preparation of polyurethane films - Characterization (Mechanical behavior - FTIR - Thermal analysis - Water absorption) - RESULTS AND DISCUSSION : Mechanical properties of different PU films - Glass transition temperature (Tg) of the PU film - Water absorption of the PU films En ligne : https://drive.google.com/file/d/13-BZ54p88tuTxZCgHHWO1PWIG7dtpMU_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17833 [article]

Réservation

Réserver ce document

Exemplaires (2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011556	-	Périodique	Bibliothèque principale	Documentaires	Disponible
011557	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Investigation on treatment of tannery effluent through ozonation / Vasudevan Preethi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 9 (09/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 9 (09/2009) . - p. 302-307 Titre : Investigation on treatment of tannery effluent through ozonation Type de document : texte imprimé Auteurs : Vasudevan Preethi, Auteur ; K. Iyappan, Auteur ; N. Balasubramanian, Auteur ; C. Srinivasakannan, Auteur Année de publication : 2009 Article en page(s) : p. 302-307 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biodégradation Cinétique chimique Cuirs et peaux -- Industrie -- Aspect de l'environnement Eaux usées -- Epuration Eaux usées -- Recyclage Ozonation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Experiments were conducted on treatment of leather effluent by ozonation covering wide range in operating conditions. The influence of parameters such as influent pH, ozone flow rate and initial effluent concentration on ozonation efficiency has been critically examined. A maximum of COD removal efficiency of 92% has been achieved under optimum operating conditions. The ozonation of leather effluent has been modeled using pseudo first order kinetics. It has been observed from the present investigation that the biodegradability index of the tannery effluent has increased from an initial value of 0.18 to 0.49 due to ozonation indicating favorable adaptation of the technique as primer for biochemical methods. En ligne : https://drive.google.com/file/d/1DBR_2hghY86GXUypvjjNjgaJSIuvMA5y/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17834 [article]

Réservation

Réserver ce document

Exemplaires (2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011556	-	Périodique	Bibliothèque principale	Documentaires	Disponible
011557	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Adsorptive removal of As(V) from aqueous solution by Zr(IV)-loaded skin shavings / Jiao Limin in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 9 (09/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 9 (09/2009) . - p. 308-315 Titre : Adsorptive removal of As(V) from aqueous solution by Zr(IV)-loaded skin shavings Type de document : texte imprimé Auteurs : Jiao Limin, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2009 Article en page(s) : p. 308-315 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbants et adsorbants Arsenic Cuirs et peaux -- Déchets Cuirs et peaux de porcs Déchets -- Elimination Isotherme d'adsorption Solutions aqueuses (chimie) Wet-white (tannage) Zirconium Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Wet-white shavings are one of the main solid wastes produced in the leather industry. In this paper, Zirconium (IV)-loaded adsorbent (ZrLA) was prepared by using wet-white shavings as the supporting matrix. The fundamental adsorption behaviors of this new adsorbent for arsenic [As(V)] were investigated. It was found that the adsorption capacity of ZrLA for As(V) in aqueous solution was 60.90 mg-g-1, when the initial concentration of As(V) was 75.0 mg. L-1 at pH 4.0 and the dosage of ZrLA was 1.0 g.L-1. The initial pH of As(V) solution significantly affected adsorption capacity of ZrLA to As(V) and the optimal pH for adsorption was in the range of 3.0-6.0. The adsorption isotherms of As(V) could be well fitted by the Langmuir equation, and the maximum adsorption capacities calculated by the Langmuir equation were close to those determined by experiments. The adsorption kinetics of As(V) on ZrLA could be satisfactorily described by the pseudo-second-order rate model. The adsorption capacity was increased with the increase of the zirconium content in ZrLA, and the highest adsorption capacity was obtained when zirconium content of ZrLA was 90-110 mg.g-1. Note de contenu : - EXPERIMENTAL METHODS : Materials - Preparation of Zr(IV)-loaded absorbent based on wet-white shavings - Preparation of As(V) stock solution - Effect of initial pH on adsorption capacity of ZrLA to As(V) - Adsorption isotherms - Effect of zirconium content in ZrLA on adsorption capacity - Adsorption kinetics - RESULTS AND DISCUSSION : Effect of initial pH on adsorption capacity of ZrLA to As(V) - Adsorption isotherm - Effect of the zirconium content in ZrLA on As(V) adsorption - Adsorption kinetics En ligne : https://drive.google.com/file/d/1UEbM9mmPakXpBVSI8vBe0FL-y0wo2W29/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17835 [article]

Réservation

Réserver ce document

Exemplaires (2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011556	-	Périodique	Bibliothèque principale	Documentaires	Disponible
011557	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Recovery of collagen from phosphonium tanned leather shavings and application as formaldehyde scavenger in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 9 (09/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 9 (09/2009) Titre : Recovery of collagen from phosphonium tanned leather shavings and application as formaldehyde scavenger Type de document : texte imprimé Année de publication : 2009 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Capteurs chimiques Collagène Cuirs et peaux -- Déchets -- Recyclage Formaldéhyde Formaldéhyde -- Elimination Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Samples of collagen extracted from phosphonium tanned leather shavings by three different methods (acid, alkali, magnesium oxide dissolution and alkaline protease hydrolysis treatments) were characterized with respect to their components and morphology of fibril network. The ratio of collagen gained was 90% by the process of alkali dissolution and enzyme hydrolysis, which was much higher than that of acid and alkali methods. The results from amino acid analysis showed that the components of extracted collagen were similar with that of commercial gelatin. The Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis (SDS-PAGE) results indicated that the extracted substance was the mixture of polypeptide and amino acid. The polypeptide and amino acid exposed to hydrophilic functional groups including carboxyl, hydroxyl, amino group etc. These functional groups especially amino group can react with formaldehyde which leads to scavenge formaldehyde. The morphological change of leather shavings treated by magnesium oxide and alkaline protease was clearly presented with scanning electron microscope. The percentage of formaldehyde removal and thickening rate of collagen were 51.8% and 10.4%, respectively. Therefore, the collagen from the leather shavings and used as the formaldehyde scavenger has a good potential in achieving the innocent treatment and reuses of the solid leather wastes. En ligne : https://drive.google.com/file/d/1yE-gqcl5axgFcpVPlYQwE85efCOch21E/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17836 [article]

Réservation

Réserver ce document

Exemplaires (2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011556	-	Périodique	Bibliothèque principale	Documentaires	Disponible
011557	-	Périodique	Bibliothèque principale	Documentaires	Disponible