Accueil
Catégories
Ajouter le résultat dans votre panier Affiner la recherche
Etendre la recherche sur niveau(x) vers le bas
The effect of chromium on the chemical and physical properties of industrial sludge based geopolymer / Imad El Fellah in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 32, N° 3 (06/2022)
[article]
Titre : The effect of chromium on the chemical and physical properties of industrial sludge based geopolymer Type de document : texte imprimé Auteurs : Imad El Fellah, Auteur ; Rabie Fath Allah, Auteur ; Asmaa Fakih Lanjri, Auteur ; Mohammed Ammari, Auteur ; Laila Ben Allal, Auteur Année de publication : 2022 Article en page(s) : p. 141-147 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Boues résiduaires
Boues thermales -- Analyse
Caractérisation
Chrome
GéopolymèresLes géopolymères sont la réciproque des polymères organiques. À la place de dérivés du pétrole et de la chaîne carbonée, on utilise de la matière minérale composée de silice et d’alumine.
Les géopolymères sont basés sur des alumino-silicates désignés sous le terme poly(sialate), qui est une abréviation de poly(silico-oxo-aluminate) ou (-Si-O-Al-O-)n (soit n le degré de polymérisation). La structure chimique de la Figure 1 montre un géopolymère poly(sialate-siloxo) résultant d'une géosynthèse de poly(silisique) acide (SiO2)n et de potassium alumino-silicate, en milieu alcalin (KOH, NaOH). Dans cette structure, le groupement sialate (Si-O-Al-O-) est un agent de réticulation.
On pense que le mécanisme de la synthèse géochimique se fait par l'intermédiaire d'oligomères (dimère, trimère) qui constituent les véritables groupements structuraux unitaires formant une structure macromoléculaire tridimensionnelle.
Polymères -- Synthèse
Résistance à la compressionIndex. décimale : 668.4 Plastiques, vinyles Résumé : This paper investigates the immobilization of chromium in the industrial sludge-based geopolymer. Mechanical, physical and microstructure properties were used to characterize different samples. The results show that lower heavy metals addition has less effect on the compressive strength. However, excessive addition of Cr(VI) (1.5 and 3%) causes a deterioration of geopolymer matrix with a significant drop of the compressive strength. The compressive strength shows that the use of sodium hydroxide as an alkaline activator is not suitable for chromium immobilization. The use of 1.5 and 3% amount of chromium increases the conductivity of leachates, which explains a change in the microstructure of materials. This is in agreement with the results of compressive strength. XRD patterns of all samples show an amorphous structure with less effect of chromium on the crystalline phases. SEM of the reference sample demonstrates a dense structure of binder. However, the porosity of the matrix increases with the addition of 3% Cr(VI). Note de contenu :
- MATERIALS AND METHODS : Materials - Synthesis of geopolymers - Compressive strength - Conductivity - Characterization
- RESULTS AND DISCUSSION : Compressive strength - The effect of chromium on the conductivity of leachetes - X-ray diffraction analysis (XRD) Scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS)
- Table 1 : Chemical composition of industrial sludge determined by X-ray fluorescence
- Table 2 : The mix proportions used for the preparation of geopolymer samplesDOI : https://doi.org/10.18280/rcma.320305 En ligne : https://www.iieta.org/download/file/fid/77317 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38206
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 32, N° 3 (06/2022) . - p. 141-147[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 23830 - Périodique Bibliothèque principale Documentaires Disponible The path to greater resistance / Abhishek Srivastava in EUROPEAN COATINGS JOURNAL (ECJ), N° 6 (06/2018)
[article]
Titre : The path to greater resistance : Effect of reactive diluents on UV-curable wood coating properties Type de document : texte imprimé Auteurs : Abhishek Srivastava, Auteur Année de publication : 2018 Article en page(s) : p. 26-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Revêtements
Brillance (optique)
Copolymère uréthane acrylate
Diluants
Essais dynamiques
Formulation (Génie chimique)
Mesure
Polyesters
Polymères -- Synthèse
Polyols
Polyuréthanes
Résistance à l'abrasion
Revêtements -- Propriétés chimiques
Revêtements -- Propriétés mécaniques
Revêtements -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : UV-curable polyurethane acrylate wood coatings were studied with the aim of enhancing protective and decorative properties. Adding reactive diluents may improve coating hardness, ease of application as well as resistance to abrasion and chemicals but it is a delicate balance. Incorporating too much of the diluents can cause micro-distortions on the surface, and brittleness - impairing gloss and scratch resistance. Note de contenu : - Experimental : Polyester polyol synthesis - Urethane acrylate synthesis - Polyurethane acrylate synthesis - Measurements - Preparation of coating samples - UV curing of samples - PU-acrylate resin analysis shows low molecular weight - Reactive diluents improve coating resistance - Scratch hardness
- Abrasion resistance
- Gloss at 60° angle
- Pencil hardness
- Cross hatch hardness
- Hydrocarbon chain in hdda results in better chemical resistance
- Excellent stain resistance
- Correct balance of reactive diluents enhances performance
- FIGURES : 1. Acid value of polyester polyol - 2. Hydroxyl value of a) polyester polyol and b) PU acrylate resin - 3. IR spectrum of the PU-acrylate resin - 4. Molecular weight of PU-acrylate resin
- TABLES : 1. Formulation of coating samples - 2. Viscosity and refractive index of coating samples - 3. IR spectrum of the PU-acrylate resin
En ligne : https://drive.google.com/file/d/1Bm5rZ9Ypm6YgAwLm2o53LpPBzIv1YWf9/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30721
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 6 (06/2018) . - p. 26-32[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20010 - Périodique Bibliothèque principale Documentaires Disponible The preparation of hybrid trimer by cyclo-oligomerization of TDI and HDI and its curing process with polyols to form elastic PU coating / Qian Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)
[article]
Titre : The preparation of hybrid trimer by cyclo-oligomerization of TDI and HDI and its curing process with polyols to form elastic PU coating Type de document : texte imprimé Auteurs : Qian Wang, Auteur ; Hang Xu, Auteur ; ShengZhong Zhou, Auteur ; Sébastien Garnier, Auteur ; Stefan Füldner, Auteur ; Lin Ye, Auteur ; Zengguo Feng, Auteur Année de publication : 2017 Article en page(s) : p. 1279-1288 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diisocyanate d'hexaméthylène
Diisocyanate de toluèneLe diisocyanate de toluène (TDI : Toluene diisocyanate) est un composé organique, toxique et allergène, appartenant au groupe des isocyanates.
C'est l'un des monomères de départ utilisés pour la production de polyuréthane par polymérisation.
Le TDI peut réagir avec un polyol ce qui permet de former une structure uréthane.
Le TDI est produit industriellement en faisant réagir du diaminotoluène (en fait un mélange de 2,4-diaminotoluène et de 2,6-diaminotoluène dans un ratio 80:20) avec du phosgène (COCl2), ce qui conduit au TDI avec une production secondaire de chlorure d'hydrogène HCl.
Il sert à fabriquer des mousses expansées, molles, semi-rigides ou rigides de polyuréthane, des adhésifs, peintures, enduits souples, élastomères, etc.
Elasticité
Oligomères
Polymères -- Synthèse
Polyuréthanes
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : The hybrid cyclic isocyanate trimer with appropriate functionality and good solvent tolerance which can be used as a building block to construct polyurethane (PU) coatings was prepared by cyclo-oligomerization of toluene diisocyanate (TDI) and hexamethylene diisocyanate (HDI). Among all the tested catalysts, the self-made catalyst 3-(trimethylammonio)propyl carbonate (Cat. 4) was found to possess enough catalytic efficiency to confirm the NCO conversion to reach about 50% with both high (1 wt%) and low (0.25 wt%) catalyst loading at low temperature (40°C). The IR and NMR results proved the formation of a hybrid trimer, while HPLC results showed hybrid TDI/HDI trimer predominated in the product and only trace amounts of TDI monomer (<0.5 wt%) and oligomer with higher degree of polymerization (DP) remained. Furthermore, the formed hybrid oligomer exhibited excellent solvent tolerance to benzene, chlorinated, and acetate solvents. Consequently, Cat. 4 was demonstrated to be a suitable catalyst for cyclo-oligomerization since it not only possessed enough catalytic efficiency at low temperature but also hardly resulted in higher DP oligomer. Furthermore, the curing process with PTHF-r-PEO polyol was conducted as a pilot experiment to form PU coatings at room temperature. The disappearance of NCO group in IR spectrum as well as higher storage modulus against loss modulus implied the successful curing process. The strain–stress test showed the high tensile strength of formed PU coating, whereas the rheological test and dynamic mechanical analyzer proved the formed PU coating was a typical elastic material with good crosslink structure. These results indicate the promising potential of formed PU made from hybrid TDI/HDI trimer for coating applications. Note de contenu : - EXPERIMENTAL : Materials and measurement - Synthesis of TDI/HDI hybrid trimer - Synthesis of polyurethane with TDI/HDI oligomers
- RESULTS AND DISCUSSION : Catalytic screening - The characterization of TDI/HDI trimers - Influence of the ratio of TDI/HDI on the oligomerization - Solvent compatibility - The curing process of TDI/HDI trimerDOI : 10.1007/s11998-017-9926-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9926-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29628
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1279-1288[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 19441 - Périodique Bibliothèque principale Documentaires Disponible 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]
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 retraitIndex. 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 HBPEn ligne : https://drive.google.com/file/d/1E-yNeSRgfe2iItWez_p55B8SmbCRWwzG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28551
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 5 (05/2017) . - p. 153-161[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 18894 - Périodique Bibliothèque principale Documentaires Disponible The use of poly(styrene-co-chloromethyl styrene) in the modification of triglyceride oils / Tugba Hayri-Senel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)
[article]
Titre : The use of poly(styrene-co-chloromethyl styrene) in the modification of triglyceride oils Type de document : texte imprimé Auteurs : Tugba Hayri-Senel, Auteur ; Pelin Yazgan-Birgi, Auteur ; Fatih Bildik, Auteur ; A. Tuncer Erciyes, Auteur Année de publication : 2022 Article en page(s) : p. 1583-1593 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Huiles et graisses
Liants -- Synthèse
Polyaddition
Polymères -- Synthèse
Polystyrène-co-chlorométhylstyrène
Revêtements -- Additifs
Revêtements organiques
TriglycéridesIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, Poly(styrene-co-chloromethyl styrene) [Poly(St-co-CMS)] was prepared and used in the modification of triglyceride oils. The obtained modified triglyceride product was examined in view of oil-based binder. Nitroxide-mediated radical polymerization (NMRP) technique was applied for Poly(St-co-CMS) synthesis. Chloro groups on the Poly(St-co-CMS) backbone were reacted with 2-amino-1-butanol (2-AB) in order to obtain a polymer with hydroxyl ended side branches, [Poly(St—OH)], which were further combined with partial glycerides (PGs) through the reaction with toluene diisocyanate (TDI). The resulting product can also be considered as a polystyrene-modified urethane oil [Poly(St-OH)-SUO]. The structures of both intermediates, [Poly(St-co-CMS), Poly(St—OH)], and final products [Poly(St-OH)-SUO] were verified by using FTIR and 1H-NMR analyses. Additionally, thermal properties of the samples were determined. The film properties of Poly(St-OH)-SUO samples prepared with different polymer/oil ratios and classic urethane oil were examined. Poly(St-OH)-SUO-40 sample exhibited the best film properties among the others. In the end, the obtained results showed that Poly(St-OH)-SUO-40 could be utilized as an oil-based binder. Note de contenu : - Materials
- Characterization
- Synthesis of poly(St-co-CMS)
- Synthesis of poly(St-OH)
- Synthesis of partial glyceride mixture from sunflower oil
- Preparation of classical urethane oil
- Preparation of polystyrene-modified urethane oil [poly(St-OH)-SUO]
- Determination of film properties
- Table 1 : The polymerization conditions and properties of the Poly(St-co-CMS) sample (Temperature: 135 °C, 8 h)
- Table 2 : Ratios of the materials used in all trials
- Table 3 : The comparison of the film properties
- Table 4 : Comparison of alkali resistances of varies oil-based binder samples 30,31,33,34,35,36,37,38,39,40,41,42 taken from the literature with the Poly(St-OH)-SUO-40DOI : https://doi.org/10.1007/s11998-022-00631-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00631-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38291
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1583-1593[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 23672 - Périodique Bibliothèque principale Documentaires Disponible The wettability effect of branched polyglycerols used as performance additives for water-based printing inks / Mariusz Tryznowski in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)
PermalinkUnderstanding the role of alkyd composition in anticorrosive coatings / Priyanka Dutta in PAINTINDIA, Vol. LXV, N° 6 (06/2015)
PermalinkUV-curable alkyd coating with self-healing ability / Saman Nornadila Mohd in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)
PermalinkWater-compatible, pH-sensitive, colour-changing polyurethane with low-temperature flexibility / Yong-Chan Chung in COLORATION TECHNOLOGY, Vol. 133, N° 3 (06/2017)
PermalinkWaterborne hybrid (alkyd/styrene acrylic) emulsion polymers and exterior paint applications / Nurullah Kartaloglu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)
Permalink