Adsorption properties of acid dye on amine-terminated dendritic polymer / Qiang Taotao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 3 (05-06/2017)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 3 (05-06/2017) . - p. 112-122 Titre : Adsorption properties of acid dye on amine-terminated dendritic polymer Type de document : texte imprimé Auteurs : Qiang Taotao, Auteur ; Zhao Jing, Auteur ; Bu Qiaoqiao, Auteur ; Ren Longfang, Auteur Année de publication : 2017 Article en page(s) : p. 112-122 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Colorants -- Adsorption Colorants acides Eaux usées -- Epuration Polymères -- Synthèse Polymères à terminaison amine Polymères dendritiques Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A series of amine-terminated dendritic polymers (ADPs) were synthesized by stepwise substitution reaction and were used as an adsorbent for removal of acid black dye NT from aqueous solution. Comparison experiments showed that the ADP-3 has good adsorption effect. Then, the effects of various parameters such as initial acid black dye NT concentration (50-300mg/L) and solution pH(1.5- 6.5) were investigated. The point of zero charge (PZC) of ADP-3 has been determined. Specific surface area and average adsorption pore size of the ADP-3 were 21.378m2/g and 3.833nm, respectively. Field scanning electron microscopy (FESEM) indicated that the adsorption material has porous structure, which provided favorable conditions for adsorption process. The experimental data were analyzed by Langmuir and Freundlich models of adsorption. Equilibrium data were fitted well with the Freundlich model. Thermodynamics parameters, ?G, ?H and ?S indicate that the adsorption of acid black dye NT onto ADPs were spontaneous and endothermic process in nature. Pseudo-first-order and pseudo-second-order kinetic models vvere used to fit the adsorption kinetic data. The adsorption kinetics was found to follow the pseudo-first-order kinetic model. Amino blocking indicated that the amine content plays an important role in the adsorption process. The adsorbent was also applied to the treatment of leather dye effluent, the results showed that ADP-3 exhibit a prominent adsorption property on leather dye effluent. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and instruments - Preparation of ADP - Contrast experiments - Characterisation of products - Adsorption experiments - Adsorption mechanism - Adsorption application in leather dye effluent - RESULTS AND DISCUSSION : Amino contents - Contrast experiments results - The point of zero charge (PZC) of ADP-3 - Instrument characterization - Adsorption experiment results - Adsorption kinetics - Adsorption mechanism - Adsorption application in leather dye effluent Permalink : https://portail.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28795 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
19049	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Application of carboxyl-functionalized epoxy resin in the leather tanning process / Bin Lyu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 7 (07/2018)

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 7 (07/2018) . - p. 225-231 Titre : Application of carboxyl-functionalized epoxy resin in the leather tanning process Type de document : texte imprimé Auteurs : Bin Lyu, Auteur ; Li Yajuan, Auteur ; Dangge Gao, Auteur ; Jianzhong Ma, Auteur ; Lv Leihong, Auteur Année de publication : 2018 Article en page(s) : p. 225-231 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Détérioration enzymatique Douceur (toucher) Eaux usées -- Teneur en chrome hexavalent Epoxydes Groupement carboxyle Polymères -- Synthèse Réactions chimiques Stabilité hydrothermale Tannage Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning is widely used in the tanning process ; however, it can cause environmental pollution. Leather tanned with epoxy resin was considered as a more environmentally friendlyprocess, but it takes as long as five days for reaction, and results in poor performance of leather. The aim of the present study was to tan leather collagen with a carboxyl-functionalized epoxy resin, which was thought to be an eco-friendly tanning process and the reaction time was shortened to 12h. The reaction between carboxyl-functionalized epoxy resin and leather collagen can be divided into two stages, the reaction of epoxy group with leather collagen and the reaction of carboxyl group with leather collagen. The influences of tanning conditions (medium pH, epoxy resin amount and reaction time) on the properties of tanned leather were also discussed. In the first stage, the epoxy group was reacted with leather collagen in basic conditions. The results showed that the carboxyl-functionalized epoxy resin could better penetrate into the leather fibers when the pH value was 8.5, and the best effect of tanned leather collagen was found using reaction condition of pH 7.0. In the second stage, it was the reaction of carboxyl group to leather collagen in acid conditions, and the best effect was found under the condition of pH was 3.5. Meanwhile, it provided a better tanning effect when the carboxyl-functionalized epoxy resin amount was 6% and the reaction time was 12h. The chrome-less tanning process that carboxyl-functionalized epoxy resin combination with 3% chrome was studied. The results showed that the hydrothermal stability and strength properties of leather tanned by carboxyl-functionalized epoxy resin with 3% chrome were close, even superior, to those of the leather produced by conventional chrome tanning with 8% chrome. Note de contenu : - MATERIALS AND METHODS : - Material - Methods : Synthesis of the carboxyl-functionalized epoxy resin - Tanning methodology - Testing and characterization : Shrinkage temperature - Thickness increment ratio - Mechanical properties - Softness - Enzymatic degradation - Chrome content in leather and waste water - Calculation - RESULTS : - Tanning conditions of carboxyl-functionalized epoxy resin pH : The amount of tanning agent - Chrome-less tanning results : SEM topography of the leather - Physical properties - Mechanical properties - Softness - Enzymatic degradation - Chrome content in leather and waste water Permalink : https://portail.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30830 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20080	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Application of nonionic gemini aliphatic polyurethane surfactant for improving the performance of vegetable tanned leather / Shuangquan Lai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 11 (11/2019)

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 11 (11/2019) . - p. 403-412 Titre : Application of nonionic gemini aliphatic polyurethane surfactant for improving the performance of vegetable tanned leather Type de document : texte imprimé Auteurs : Shuangquan Lai, Auteur ; Yong Jin, Auteur ; Liangjie Shi, Auteur ; Shenghua Wang, Auteur ; Heng Yang, Auteur Année de publication : 2019 Article en page(s) : p. 403-412 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique Agents de tannage Collagène Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Morphologie (matériaux) Photostabilité Polymères -- Synthèse Polymères aliphatiques Retannage Surfactants Surfactants -- Synthèse Tannage végétal Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Vegetable tanned leathers with good embossing, air permeability, natural look and pleasing firm handle properties have applied in many goods with multiple uses. However, the performances of vegetable tanned leathers still need a further improvement. In this work, a kind of nonionic gemini aliphatic polyurethane surfactants (GPUs) with different hydrophobic chain lengths as a retanning agent combined with polyacrylic acid (PAA) for condensed tannin tanned leathers to improve their performances. The effects of the alone or combined use of the PAA and GPU, the hydrophobic chain length of GPU, and the offer percentage of retanning agent were studied by evaluating the organoleptic properties, shrinkage temperature, mechanical properties of the obtained leathers. The best performance was found in the leather retanned with PAA and 12-GPU-550 complex retanning agent, and the mechanical properties of leather could be improved when the total offer percentage was controlled at 4 wt%. Moreover, the collagen fibers morphologies and lightfastness properties of leathers retanned with different retanning agents were investigated. The results showed that the total color difference ΔE and the yellowness index Δb decreased significantly with the introduction of 12-GPU-550, and the leather retanned with PAA and 12-GPU-550 complex retanning agent showed the lowest value of ΔE, demonstrating that the lightfastness properties were improved significantly. Therefore, it was an attractive way to combine use of PAA and 12-GPU-550 as complex retanning agent, which can improve the mechanical and lightfastness properties of vegetable tanned leathers simultaneously. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of polyacrylic acid (PAA) - Synthesis of nonionic gemini aliphatic polyurethane surfactants (GPUs) - Application of the synthesized retanning agents - The organoleptic and physical mechanical properties of leathers - Scanning Electron Microscopy analysis of leathers - Light fastness properties of leathers - RESULTS AND DISCUSSION : Effects of different retanning agents on the properties of leathers - Effect of the hydrophobic chain length of GPU on the properties of leathers - Effect of the offer percentage of complex retanning agent on the properties of leathers - SEM analysis of leathers - Effects of retanning agents on the lightfastness properties of leathers Permalink : https://portail.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33252 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21341	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Auto-deposition coating / Vikesh Kumar Singh in PAINTINDIA, Vol. LXVII, N° 9 (09/2017)

[article]  inPAINTINDIA > Vol. LXVII, N° 9 (09/2017) . - p. 117-130 Titre : Auto-deposition coating Type de document : texte imprimé Auteurs : Vikesh Kumar Singh, Auteur ; Ajay Chaurasiya, Auteur Année de publication : 2017 Article en page(s) : p. 117-130 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides carboxyliques Ateliers de peinture industrielle -- Nettoyage Autodéposition chimique Dépôt électrolytique Dioxyde de titane Formulation (Génie chimique) Miniémulsions Oléique, Acide L'acide oléique vient du latin oleum et veut dire huile. C'est le plus abondant des acides gras monoinsaturés à chaîne longue dans notre organisme. Sa formule chimique brute est C18H34O2 (ou CH3(CH2)7CH=CH(CH2)7COOH). Son nom IUPAC est acide cis-9-octadécénoïque, et son nom court de lipide est 18:1 cis-9. La forme saturée de cet acide est l'acide stéarique. On le symbolise par les nombres 18:1 pour indiquer qu'il possède 18 atomes de carbone et une liaison éthylénique. Pour indiquer la position de la double liaison, on préfère indiquer le nombre de carbones entre le dernier carbone (n° 18) et le carbone où commence la double liaison (n° 9), d'où 18 - 9, qu'on écrit n - 9, en désignant par n le nombre de carbones de la chaîne. L'acide oléique est donc un acide gras insaturé, plus précisément monoinsaturé. La double liaison agit sur la forme de la molécule et des triglycérides qu’elle forme avec le glycérol. Comme la molécule ne peut pas pivoter autour de C = C, la chaîne est beaucoup moins flexible que l’acide stéarique et ne peut pas former de boule. Les molécules des esters de cet acide sont beaucoup moins compactes que la tristéarine: ces sont des huiles. À la température de notre corps c'est un liquide (huile), qui ne se solidifie qu'à 13,4 °C. Polymères -- Synthèse Polymérisation Résistance à l'hydrolyse Séchage Vinyle Index. décimale : 667.9 Revêtements et enduits Résumé : Auto-deposition is faster and more environmentally responsible than conventional coating processes; however, a typical seven-stage auto-deposition process still requires several cleaning stages. Recent advances are pushing auto-deposition technology past this boundary to offer manufacturers and coaters a coating solution that lowers the environmental impact even further, while also reducing the overall manufacturing production footprint and increasing efficiency in the assembly process. Note de contenu : - COMPARISON WITH ED COAT - A SAFER, MORE EFFICIENT PROCESS - HIGHER PERFORMANCE WITH LESS ENVIRONMENTAL IMPACT - CONTINUED ADVANCES - CHEMICAL CONCEPTS TO BACK UP AUTO-DEPOSITION - OBJECTIVES BEHIND INVENTION - DEPOSITION MECHANISM : Iron dissolution – Deposition – Auto-deposition sequence – An auto-deposition bath contains - WHERE IT WETS- IT COATS - FINAL SEALING RINSE - CURING - COATING PROPERTIES OF TYPICAL AUTO-DEPOSITION SYSTEMS - EQUIPMENT CONSIDERATIONS : Coating bath control parameters - FORMULATING PRINCIPLES : Radical polymerization – Formulation basics – Acidic composition (aqueous – Alkaline composition - THESE ALKALINE COMPOSITIONS ARE MORE SUITABLE FOR THE NON STEEL SURFACES TYPICAL COMPOSITIONS : Auto-deposition composition and process with acrylic terpolymer coating – The disperse resin comprising the organic coating-forming component in this composition is a polymer comprising - SYNTHESIS OF A WATER BASED TITANIUM DIOXIDE POLYMER PARTICLES VIA MINI-EMULSION : Designing the synthetic route - Finding a stable precursor system - CARBOXYLIC ACIDS AS LEGANDS: OLEIC ACID : Acrylic and methacrylic acid - GENERAL REMARK ON THE HYDROLYTIC STABILITY OF ALKOXIDE PRECURSOR MOLECULE - HYDROLYTIC STABILITY WITHIN VINYLIC MONOMER MIXTURE - FORMATION OF MINIEMULSION USING OLEIC ACID ALONG WITH VINYLIC MONOMER SYSTEM - MODIFICATION USING INCREASED TIO2 LOADING - POLYMERIZATION PROCESS - DRAWBACKS ASSOCIATED Permalink : https://portail.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29339 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
19295	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Automated parallel polyurethane dispersion synthesis and characterization / Mohammed J. Nasrullah in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 1 (03/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 1 (03/2009) . - p. 1-10 Titre : Automated parallel polyurethane dispersion synthesis and characterization Type de document : texte imprimé Auteurs : Mohammed J. Nasrullah, Auteur ; Peter Schmitt, Auteur ; Richard R. Roesler, Artiste ; Dean C. Webster, Auteur ; Christy Gallagher-Lein, Auteur ; James A. Bahr, Auteur Année de publication : 2009 Article en page(s) : p. 1-10 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dispersions et suspensions Polymères -- Synthèse Polyuréthanes Solutions aqueuses (chimie) Index. décimale : 667.9 Revêtements et enduits Résumé : The synthesis of waterborne polyurethane dispersions (PUDs) using an automated parallel reactor system was explored. Waterborne PUDs are an important class of polymer dispersion that can be used in many applications such as coatings for wood finishing, glass fiber sizing, adhesives, automotive topcoats, and other applications. Herein, we present the synthesis of aqueous PUDs using a Chemspeed Autoplant A100™ automated parallel reactor system. This is the first time a PUD has been synthesized using an automated parallel reactor system. The synthesis involves the formation of an isocyanate-terminated prepolymer followed by neutralization, dispersion in water, and chain extension. Details of the methodology are discussed with respect to the process of writing the program for the synthesis to synthesizing the PUD itself with the Chemspeed. It is demonstrated that an aqueous PUD can be synthesized with an automated parallel process and the unit-to-unit results are similar. Process variables such as agitator design, rate of neutralization, and rate of water dispersion are varied as these are the three major factors which lead to the desired end product property. The controlled addition of neutralizer, water, and chain extender is an added advantage with this automated technique and gave consistent results in all the units. The PUDs were characterized for their particle size, viscosity, and percent solids. DOI : 10.1007/s11998-008-9102-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9102-z.pdf Format de la ressource électronique : Pdf Permalink : https://portail.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4840 [article]

Réservation

Réserver ce document

Exemplaires (2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011246	-	Périodique	Bibliothèque principale	Documentaires	Disponible
011271	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Aziridine cure of acrylic colloidal unimolecular polymers (CUPs) / Jigar K. Mistry in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 4 (07/2013)  

Permalink

Bio-based hybrid polymers from vinyl ester resin and modified palm oil : synthesis and characterization / A. Fakhari in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)

Permalink

Bio-based polyester itaconates as binder resins for UV-curing offset printing inks / Tobias Robert in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

Permalink

Caoutchoucs et textiles synthétiques / Jean Vène / 1967

Permalink

Castor oil-based waterborne hyperbranched polyurethane acrylate emulsion for UV-curable coatings with excellent chemical resistance and high hardness / Daidong Wei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)

Permalink

Characterization on biodegradation of enzymatically synthesized polylactic acid by using alkaline protease and lipase / Didem Omay in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 2 (05/2014)

Permalink

Chemical and anticorrosion characterization of polysilsesquioxane coatings catalyzed by different acids / Wentao Xing in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 1 (03/2008)  

Permalink

Climate protection via bio-based polyurethane dispersions with heat activation / Daniel Maga in ADHESION - ADHESIVES + SEALANTS, Vol. 14, N° 4/2017 (2017)

Permalink

Les (co)polymères fluorés / Bruno Améduri in L'ACTUALITE CHIMIQUE, N° 421 (09/2017)

Permalink

Le CO2 véritable matière première pour une chimie verte des polymères / Henri Cramail in L'ACTUALITE CHIMIQUE, N° 371-372 (02-03/2013)  

Permalink

Combinatorial methods / Amitabha Ray Chaudhuri in PAINTINDIA, Vol. LVII, N° 11 (11/2007)

Permalink

Conductive polymers / Paresh Narendra Darshani in PAINTINDIA, Vol. LXIII, N° 2 (02/2013)

Permalink

Corrosion protection of mild steel by nano-colloidal polyaniline/nanodiamond composite coating in NaCl solution / Habib Ashassi-Sorkhabi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 3 (05/2014)  

Permalink

Cosmetic properties of comb-like PU film-formers / Claudio Pirovano in PERSONAL CARE EUROPE, Vol. 9, N° 2 (04/2016)

Permalink

Cyclodextrin-based hyperbranched polyester: synthesis, characterization, and antimicrobial activity / Swaminathan Prabu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)  

Permalink

---

1 2 3 4 5 6 (1 - 20 / 137) Par page : 25 50 100 Tout afficher