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Preparation and characterization of hydrophobic flat sheet membranes based on a recycled polymer / H. Ajari in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 3 (07/2019)
[article]
Titre : Preparation and characterization of hydrophobic flat sheet membranes based on a recycled polymer Type de document : texte imprimé Auteurs : H. Ajari, Auteur ; Adel Zrelli, Auteur ; B. Chaouachi, Auteur ; M. Pontié, Auteur Année de publication : 2019 Article en page(s) : p. 376-382 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact
Caractérisation
Eau
Hydrophobie
Membranes (technologie)
Perméation
Polyéthylène basse densité
Produits et matériaux recyclés
RugositéIndex. décimale : 668.4 Plastiques, vinyles Résumé : In this work, we used a recycled low-density polyethylene (LDPE) in order to prepare flat sheet membranes with different polymer concentrations (5 and 10%). The used chemical method for the membrane's preparation is the phase inversion. After obtaining the membranes, we characterized them by atomic force microscopy (AFM) and scanning electron microscopy (SEM) to study their structure and surface characteristics. Based on the SEM images, our membranes have a dense skin layer. In addition, we observed a decrease in the porosity with the increase in the polymer concentration. When the polymer concentration increases from 5 to 10% the porosity decreases from 35.54% to 20.28%. Furthermore, we remarked significant changes in the contact angle and the surface roughness with the increase of the polymer concentration. The roughness increases from 363 to 577 nm for the same evolution of the polymer concentration. These high values of roughness imply obtaining values of contact angles greater than 90° and hydrophobic membranes, which is beneficial for the membrane distillation. Furthermore, the use of our membranes in vacuum membrane distillation (VMD) experiments showed a permeate flux up to 1.503 kg/hm2; for the membrane with 35.54% of porosity and 5% of polymer concentration. Note de contenu : - EXPERIMENTAL STUDY : Materials - Membrane preparation - Characterization of flat sheet membranes
- RESULTS AND DISCUSSION : Membrane structure - Membrane roughness and contact angle - Water permeationDOI : https://doi.org/10.3139/217.3717 En ligne : https://drive.google.com/file/d/1d5SBJDQmHbOOBVJ_sKCwqCskU4rSx4CL/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32899
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Code-barres Cote Support Localisation Section Disponibilité 21036 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characterization of melamine modified urea-formaldehyde foam / Y. Ma in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)
[article]
Titre : Preparation and characterization of melamine modified urea-formaldehyde foam Type de document : texte imprimé Auteurs : Y. Ma ; W. Zhang ; C. Wang ; Y. Xu ; S. Li ; F. Chu Année de publication : 2013 Article en page(s) : p. 188-198 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact
Caractérisation
Combustion
Formaldéhyde
Fumée -- Analyse
Isolants
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
Mousses plastiques
Mousses plastiques -- Propriétés mécaniques
Polymères
Résistance à l'humidité
Résistance à la compression
Réticulants
Surfactants
Thermocinétique
UréeIndex. décimale : 668.9 Polymères Résumé : Melamine-urea-formaldehyde (MUF) foam was prepared using melamine modified urea formaldehyde resin. The effects of blowing agent, curing agent and surfactant on the properties of MUF foam such as apparent densities, compression strength, microstructure, fragility, limited oxygen index, thermal conductivity and formaldehyde emission were investigated. The best performance of MUF was obtained as the composition of blowing agent, curing agent and surfactant were 2.5 %, 18 % and 12 % respectively. The water resistance of MUF foam, contents of foam’s burning gas, curing mechanism and physical properties were also studied by Contact angle analyzer, TGA-FT-IR, FT-IR and 13C NMR. Note de contenu : - EXPERIMENTAL : Materials - MUF resin and foam preparation - Characterizations of MUF foam - SEM analysis of MUF foam - Contact angle measurements - TGA-FT-IR analysis of MUF foam - FT-IR analysis of MUF resin and foam - Liquid C NMR analysis of MUF resin - Solid C NMR analysis of MUF foam
- RESULTS AND DISCUSSION : The influence of the blowing agent amount on the MUF foam properties - The influence surfactant amount on MUF foam properties - The influence curing agent amount on MUF foam properties - Water resistance of MUF foam - TGA-FT-IR analysis of MUF foam - FT-IR analysis of MUF resin and foam - C NMR spectrogram of MUF resin and foamDOI : 10.3139/217.2684 En ligne : https://drive.google.com/file/d/1CEUpiEWVqVziV5KzXAN1uOSCCzIUYd28/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18432
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Code-barres Cote Support Localisation Section Disponibilité 15050 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characterization of PVOH/kaolin and PVOH/talc coating dispersion by one-step process / Vaishali Saroha in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)
[article]
Titre : Preparation and characterization of PVOH/kaolin and PVOH/talc coating dispersion by one-step process Type de document : texte imprimé Auteurs : Vaishali Saroha, Auteur ; Hina Khan, Auteur ; Sharad Raghuvanshi, Auteur ; Dharm Dutt, Auteur Année de publication : 2022 Article en page(s) : p. 1171-1186 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique
Angle de contact
Caractérisation
Kaolin
Papier -- Revêtements
Papier et carton couché
Perméabilité
Résistance à la traction
Résistance aux huiles et graisses
Revêtements organiques
Stabilité thermique
Talc
Transmission de vapeur d'humiditéIndex. décimale : 667.9 Revêtements et enduits Résumé : The poor barrier of cellulosic paper against water vapor and oil limits its wide application as a packaging material. Lamination, extrusion, and dispersion coating are applied on paper surface to improve barrier properties. Dispersion coating can be applied to paper surface on line during paper preparation using rod coater. In the present study, an attempt has been made to increase the process speed of coating preparation by single-step process at varying pigment concentration. Coating dispersion was applied on kraft paper using laboratory rod coated and dried in hot air oven at 80°C for 5 min. Furthermore, thermal stability, water vapor barrier properties, and grease resistance of PVOH/kaolin and PVOH/talc-coated paper were studied. Additionally, the effect of single layer and bilayer coating on paper properties was also studied. Permeability model was used to predict the orientation of pigments to the surface of paper. Viscosity of both kaolin and talc-based dispersion increased with the increase in pigment concentration. Thermal studies showed that at 600°C residual mass (%) of PVOH film increased from 0.6 to 9.89% and 15% with the addition of 25% (by weight) kaolin and talc pigment. At high pigment concentration (40–50%, by weight), the highest reduction in WVTR was observed for both the pigments. Excellent coverage of paper surface and high grease resistance was observed for all coating formulations. Our study showed that talc provides better thermal and barrier properties to coated paper than kaolin. Note de contenu : - MATERIALS AND METHODS : Materials - Coating dispersion preparation - Paper coating and film preparation - Characterization - Thermogravimetric analysis (TGA) - FESEM - WVTR - KIT test - Statistical analysis
- RESULTS AND DISCUSSION : Effect of pigments on rheological properties of PVOH - X-ray diffraction (XRD) - ATR-FTIR - Thermal stability - Tensile strength - Roughness and porosity of coated paper - Contact angle
- Table 1 : Characteristic parameter of kaolin in PVA/kaolin nanocomposite film
- Table 2 : Crystallinity index of XRD diffractogram of composite film with respect to 101 plane reflections
- Table 3 : Residual mass of PVOH, PVOH/kaolin, and PVOH/talc composite film at different temperatures
- Table 4 : Roughness and porosity of uncoated and coated paper
- Table 5 : Contact angle of uncoated and PVOH/kaolin and PVOH/talc-coated papers
- Table 6 : Grease resistance (KIT test) of single- and double-coated paperDOI : https://doi.org/10.1007/s11998-021-00596-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00596-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38045
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Code-barres Cote Support Localisation Section Disponibilité 23574 - Périodique Bibliothèque principale Documentaires Disponible Preparation and evaluation of degradable polyurethane with low surface energy for marine antifouling coating / Yue Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)
[article]
Titre : Preparation and evaluation of degradable polyurethane with low surface energy for marine antifouling coating Type de document : texte imprimé Auteurs : Yue Xu, Auteur ; Guoqing Wang, Auteur ; Zhuolin Xie, Auteur ; Aiming Wang, Auteur Année de publication : 2019 Article en page(s) : p. 1055-1064 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Anti-adhérence (matériaux)
Energie de surface
Hydrolyse
Marines (peinture)
Polymères -- Détérioration
Polymères -- Synthèse
Polyuréthanes
Revêtements antisalissures:Peinture antisalissuresIndex. décimale : 667.9 Revêtements et enduits Résumé : Two polyurethanes were prepared through the reaction of 1,6-diisocyanatohexane (HDI) with two kinds of alcoholates. The first alcoholate was synthesized from alcoholized lactide (PLA) and dodecafluoroheptyl methacrylate (DFHMA) with the solid super acid (SO42−/ZrO) acting as the catalyst, and the other alcoholate was a mixture of PLA and DFHMA. The composition and structure of these two polyurethanes were investigated by infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). The mass loss, attachment of bacteria and algae, and the water contact angle were used to evaluate the degradable and antifouling performance of the two polyurethane coatings. The results showed that the maximum contact angle of PLIPFI reached 129°, its mass loss was higher than 10% in 65 days, and after 65 days, the mass loss appeared to be stable, and the antiadhesion performance of the polyurethanes coatings was also enhanced. All of these results indicated that the PU modified with a graft segment may be promising for obtaining antifouling materials that not only can resist the adhesion of microorganisms but also show self-renewal. Note de contenu : - Materials
- Synthesis of the polymers
- Preparation of the coating
- Composition characterization
- Structural characterization
- Hydrolytic degradation
- Contact angle measurement (CA) and surface energy (E)
- Antiadhesion tests
- Antifouling tests in the real sea environmentDOI : 10.1007/s11998-018-00180-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00180-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32861
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Code-barres Cote Support Localisation Section Disponibilité 21127 - Périodique Bibliothèque principale Documentaires Disponible Preparation and fluorine enrichment behavior of fluorinated polyester / Jinsu Xiong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 5 (09/2013)
[article]
Titre : Preparation and fluorine enrichment behavior of fluorinated polyester Type de document : texte imprimé Auteurs : Jinsu Xiong, Auteur ; Yunquan Jin, Auteur ; Baoqing Shentu, Auteur ; Zhixue Weng, Auteur Année de publication : 2013 Article en page(s) : p. 621-629 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Energie de surface
Fluorine
Fluoropolymères
Polyesters
Revêtements poudre:Peinture poudre
Surfaces (technologie)Index. décimale : 667.9 Revêtements et enduits Résumé : Poly[1,2-propylene glycol-3-(2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptoxy)]phthalate (PDFP) was prepared by the reaction of phthalic anhydride, epichlorohydrin, and 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl glycidyl ether (DFGE). The structure of PDFP was characterized with 1H-NMR, 19F-NMR, FTIR and the wettability of water and oil on cured PDFP coatings was investigated by contact angle meter. The results showed that the contact angle of water and diiodomethane on cured coatings increased with the increase of the fluorine content and could maximally attain 108° and 69°, respectively. At a fluorine content of 0.75%, the surface energy was 21.1 mJ/m2. X-ray photoelectron spectroscopic (XPS) analysis showed that the surface F/C atomic ratio was much higher than the overall F/C molar ratio, indicating that the fluoroalkyl groups in PDFP had enriched on the coating surface. It was also found that the fluorinated polyester with longer fluoroalkyl groups had the higher tendency to enrich on the coating surface. Note de contenu : - EXPERIMENTAL : Materials - Preparation of fluorinated polyester - Preparation of fluorinated polyester powder coating (PDFPPC) - Spraying and curing of fluorinated polyester powder coating - Characterizations
- RESULTS AND DISCUSSION : Preparation and structure of PDFP - Fluorine content in PDFP - Surface properties of the coatings based on PDFPPCs - Enrichment of fluoroalkyl gruops on the coating surfaceDOI : 10.1007/s11998-013-9480-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9480-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19781
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