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Mechanical-induced functionalization of graphene with sodium carboxymethyl cellulose toward enhancing anticorrosion performance of waterborne epoxy coatings / Rui Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)
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Titre : Mechanical-induced functionalization of graphene with sodium carboxymethyl cellulose toward enhancing anticorrosion performance of waterborne epoxy coatings Type de document : texte imprimé Auteurs : Rui Wang, Auteur ; Hongling Yi, Auteur Année de publication : 2023 Article en page(s) : p. 2069-2080 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption
Anticorrosifs
Anticorrosion
Caractérisation
Carboxyméthylcellulose de sodium
Dispersions et suspensions
Epoxydes
GraphèneLe graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur.
Revêtements -- Propriétés mécaniques
Revêtements en phase aqueuse
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Non-covalent modification of graphene is prepared by sodium carboxymethyl cellulose via ball milling. Adsorption and thermogravimetric analyzer (TG) indicate interaction of graphene with sodium carboxymethyl cellulose. Particle size and zeta potential results show sodium carboxymethyl cellulose with high DS play more role in assisting stabilization of graphene dispersion. The adsorption of sodium carboxymethyl cellulose onto graphene is inhibited under acidic conditions and the dispersion stability deteriorates sharply. Under neutral and alkaline conditions, the dispersions maintain stable. Embedding a small percentage of well-dispersed graphene nanosheets (CGr1.5%) in waterborne epoxy coating has remarkably improved anticorrosion performance, which is attributed to the synergistic effects of barrier properties of well-dispersed graphene nanosheets and CMC in the epoxy matrix. Open circuit potential (OCP), Tafel and electrochemical impedance spectroscopy (EIS) analysis confirmed that the corrosion rate exhibited by composite coatings with 1.5 wt% graphene is lower than that of neat epoxy coating. Note de contenu : - EXPERIMENTAL : Materials - Adsorption measurements - Preparation of CMC-graphene dispersion - Fabrication of coatings - Testing and characterization
- RESULTS AND DISCUSSION : Adsorption isotherm for CMC on graphene with different degree of substitution (DS) - TGA - Particle size distribution - Effect of CMC substitution degree on zeta potential of graphene dispersions - Morphology - Effect of pH on CMC graphene dispersion stability - Coating mechanical properties
- Table 1 : Parameters of adsorption isotherm models of CMC with different DS
- Table 2 : Mechanical properties of CMC-graphene epoxy coatings
Coating corrosion resistance
- Table 3 : Polarization parameters of coatings with different CGr contents in 3.5% NaCl solutionDOI : https://doi.org/10.1007/s11998-023-00802-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00802-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40182
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2069-2080[article]Réservation
Réserver ce documentNon-isothermal viscoelastic melt spinning with stress-induced crystallization : numerical simulation and parametric analysis / Rui Wang in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 1 (2022)
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Titre : Non-isothermal viscoelastic melt spinning with stress-induced crystallization : numerical simulation and parametric analysis Type de document : texte imprimé Auteurs : Rui Wang, Auteur ; Kuangrong Hao, Auteur ; Huaping Wang, Auteur ; Chaosheng Wang, Auteur ; Lei Chen, Auteur ; Ruimin Xie, Auteur Année de publication : 2022 Article en page(s) : p. 25-37 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Cristallisation
Extrusion filage
Phan-Thien et Tanner, Modèle de
Polyéthylène téréphtalate
Polymères -- Propriétés physiques
Rhéologie
Simulation par ordinateur
ViscoélasticitéIndex. décimale : 668.4 Plastiques, vinyles Résumé : This paper considers a model of melt spinning with stress-induced crystallization, where the melt uses the Phan Thien-Tanner model, and the solid adopts the rubber elastic model. We design a computationally efficient algorithm for solving the model. The temperature, radius, and birefringence profile in low-speed and high-speed spun PET fibers were predicted and compared with the published experimental data. The simulation results are consistent with the experimental data from the literature. Then a parametric analysis is conducted to investigate the effects of operating conditions on the spinning dynamics and reveal the relationship between the operating conditions and the final properties. The change of take-up speed has a significant influence on the crystallinity and birefringence of the fiber./ Note de contenu : - MODELING OF MELT SPINNING : Description of the melt spinning process - Basic equations - The PTT constitutive equations - Rubber elasticity model for the semi-crystalline fiber - non-isothermal stress-induced crystallization - Birefringence during crystallization
- RHEOLOGICAL CHARACTERIZATION OF POLYESTER
- NUMERICAL SOLUTION TECHNIQUE
- EXPERIMENTAL VERIFICATION AND ANALYSIS
- PARAMETRIC ANALYSIS : Effect of take-up speed - Effect of initial melt temperature - Effect of air temperature - Effect of air speed
- Table 1 : Discrete relaxation time spectrum at temperatures 270, 300, and 310°C for polyester with PTT model parameters
- Table 2 : Physical and rheological properties of PEt
- Table 3 : Parameters of fiber spinning trial run with polyesterEn ligne : https://drive.google.com/file/d/1D0G0EaIBKeOw1Zamua0psI99_jlwPNhD/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38438
in INTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 1 (2022) . - p. 25-37[article]Réservation
Réserver ce documentProgress of proficiency testing in the leather field in China / Zhiding Huang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)
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Titre : Progress of proficiency testing in the leather field in China Type de document : texte imprimé Auteurs : Zhiding Huang, Auteur ; Bo Zhang, Auteur ; Bin Li, Auteur ; Rui Wang, Auteur ; Xugen Feng, Auteur ; Tianming Zuo, Auteur Année de publication : 2023 Article en page(s) : p. 88-92 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Contrôle technique
Cuirs et peaux -- Industrie -- Législation -- Chine
Essais (technologie)
Professionnalisme
Qualifications professionnelles -- Attestation
Qualité -- ContrôleIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Inspection and testing plays an important role in ensuring product quality and safety and in promoting product quality improvement. Proficiency Testing (PT) is not only an effective technology of quality control for inspection and testing institutions but also an important way to evaluate the ability of inspection and testing institutions. Furthermore, it is a major means available for the supervision and management of inspection and testing institutions by regulatory authorities. The working mechanism, development process and organisation of PT is described and the shortcomings of PT in Chinaʼs leather field are studied in this paper. Finally, suggestions to promote the high-quality and sustainable development of PT in the leather field are put forward, for the purpose of providing a research basis for strengthening the supervision of the inspection and testing industry and promoting the capacity improvement of inspection and testing institutions. Note de contenu : - OVERVIEW OF PT IN THE LEATHER INDUSTRY IN CHINA : Working mechanism of PT in China - Development process of PT in leather field in China - Organisation of PT
- ANALYSIS OF ISSUE : The overall situation needs to be sorted out - The organisational mode and use of PT results is inconsistent - The number of PT items are insufficient
- PROPOSAL : Evaluate the overall situation - Unified specification and shared information - Strengthen R&D and service supervision
- Table 1 : Differences of PT organised by AMR and PTP
- Table 2 : List of PT organised by CNCA in leather field in China
- Table 3 : Summary of PT organised by PTP in leather fieldEn ligne : https://drive.google.com/file/d/1pHmXhptW5eIJrpF1C44Ec0vD4k2XotNE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39578
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 3 (05-06/2023) . - p. 88-92[article]Réservation
Réserver ce documentSynergistically enhancing hydrogen bonding, hydrophobic interaction and electrostatic association of collagen fiber to flavonoid aglycones for their effective separation by polyethyleneimine modification / Qixian Zhang in COLLAGEN AND LEATHER, Vol. 5 (2023)
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Titre : Synergistically enhancing hydrogen bonding, hydrophobic interaction and electrostatic association of collagen fiber to flavonoid aglycones for their effective separation by polyethyleneimine modification Type de document : texte imprimé Auteurs : Qixian Zhang, Auteur ; Rui Wang, Auteur ; Bi Shi, Auteur Année de publication : 2023 Article en page(s) : 12 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène
Flavonoïdes
Matériaux d'emballage
Polyéther imide
PolyéthylèneimineIndex. décimale : 688.8 Technologie des emballages Résumé : Compared with flavonoid glycosides, flavonoid aglycones are difficult to be separated since they have less hydroxyls. Collagen fiber (CF), a natural polymer, was once used as packing material for separation of kaempferol and quercetin (the typical flavonoid aglycones) after crosslinking by glutaraldehyde mainly based on hydrogen bonding and hydrophobic interaction in column length-diameter ratio of 60:1. Hydrophobic modification by grafting alkyl chains was then employed to enhance the hydrophobic interaction between CF and flavonoid aglycones, which can improve the separation efficiency and decrease column length-diameter ratio to 19:1. In order to further improve the adsorption capacity and separation efficiency, the strategy of simultaneously grafting hydrophobic alkyl chains (–CH2–CH2–) and alkali groups (–NH2) was adopted in this work to enhance hydrophobic interaction, hydrogen bonding and electrostatic association to flavonoid aglycones at the same time through grafting polyethyleneimine (PEI). PEI modified CF (PEI-CF) maintained the fiber structure of CF, and had higher adsorption extent and rate to flavonoid aglycones through the enhanced synergetic effect of hydrophobic interaction, hydrogen bonding and electrostatic association. As a result, PEI-CF presented a satisfactory column separation efficiency for kaempferol and quercetin even the length-diameter ratio of column was decreased to 11:1, which was much better than previously developed glutaradehyde-crosslinked collagen fiber and isobutyl-grafted collagen fiber, as well as commonly used polyamide and Sephadex LH-20. Note de contenu : - Materials
- Preparation of PEI-CF
- Characterization of PEI-CF
- Static adsorption
- Adsorption mechanism
- Dynamic adsorption and desorption
- Column chromatographic separationDOI : https://doi.org/10.1186/s42825-023-00138-2 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-023-00138-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40076
in COLLAGEN AND LEATHER > Vol. 5 (2023) . - 12 p.[article]