A comparative study of ozonation on aqueous reactive dyes and reactive-dyed cotton / Mengru Li in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 376-388 Titre : A comparative study of ozonation on aqueous reactive dyes and reactive-dyed cotton Type de document : texte imprimé Auteurs : Mengru Li, Auteur ; Zhenglei He, Auteur ; Jie Xu, Auteur Année de publication : 2021 Article en page(s) : p. 376-388 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants réactifs Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Ozonation Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Ozonation is increasingly being used and reported in recent years. This paper investigates ozonation on aqueous reactive dyes and their dyed cotton comparatively. The effects, including pH, temperature and initial dye concentration (for aqueous dyes)/water pick-up (for dyed cotton), on Reactive Blue FL-RN, Reactive Red FL-2BL and Reactive Yellow FL-2RN, were studied via Fourier Transform–infrared spectroscopy, ultraviolet-visible absorption and k/s curves. The kinetic results indicated that all the aqueous dyes were of pseudo-first order kinetics, while dyed cotton represented pseudo-secondary or pseudo-third order kinetics. Based on their different mechanisms, there was a dramatic gap between dyes and dyed cotton in ozonation performance. The curve of rate constant vs pH of dye ozonation exhibited a U-shape with the minimum value at pH 7, but for dyed cotton ozonation, the curve showed a Λ-shape optimised at pH 10. Also, high temperature resulted in hydrolysis of dyes in aqueous solution, whereas this was not applicable to dyed cotton. The effect of pick-up (0%-150% with an interval of 75%) on reactive-dyed cotton was greater than the effect of initial dye concentration (which varied from 120 to 40 mg/L) on the colour yield of aqueous reactive dyes. Note de contenu : - EXPERIMENTAL : Material - Apparatus - Pretreatments and dyeing of cotton fabrics - Ozonation - Analytical methods - Kinetics studies - RESULTS AND DISCUSSION : UV-vis absorption and K/S curves - Colour yield mechanism and FTIR analysis - Kinetics reaction order of ozonation - The change in rate constants with pH during the ozonation of reactive dyes and reactive-dyed cotton - The change in rate constants with temperature in the ozonation of reactive dyes and reactive-dyed cotton - The change in rate constants with initial dye concentration during the ozonation of reactive dyes and pick-up of ozonation on reactive-dyed cotton - Table 1 : Chemical structure λ max of the dyes' dominant sector DOI : https://doi.org/10.1111/cote.12534 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12534 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36102 [article]

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Infrared-responsive shape memory self-healing and fluorescent damage-indication anti-corrosion coatings for aluminum alloys / Xue-qi Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1431-1446 Titre : Infrared-responsive shape memory self-healing and fluorescent damage-indication anti-corrosion coatings for aluminum alloys Type de document : texte imprimé Auteurs : Xue-qi Zhang, Auteur ; Rui Ding, Auteur ; Jie Xu, Auteur ; An-lan Ji, Auteur ; Yu-chen Zhang, Auteur ; Jie Fu, Auteur ; Xiao Lv, Auteur ; Lan Yao, Auteur ; Sheng-ying Yang, Auteur ; Qing-guo Mao, Auteur ; Xuan Liang, Auteur ; Jie Liu, Auteur ; Xiao Wang, Auteur Année de publication : 2024 Article en page(s) : p. 1431-1446 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Anticorrosifs Anticorrosion Caractérisation Composites polymères Effet mémoire de forme Epoxydes Fluorescence Indication de dommages Métaux -- Revêtements protecteurs Revêtement autoréparant Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Widely applied aluminum alloys in ship hulls, underwater vehicles, and marine machinery experience severe corrosion in harsh marine environments. For corrosion protection of aluminum alloys, the most convenient, effective, and low-cost approach was the application of anti-corrosion coatings. Coatings possessing self-healing properties to spontaneously repair damages have emerged as a research focus for new types of coatings. In this study, focused on the indication and repair of anti-corrosion coating damages for aluminum alloys, the fluorescent aggregation-induced emission (AIE) composite probe, rhodamine-naphthalimide (RNI), was synthesized, and the composite polymer materials HPPA-SMPU containing 2-hydroxyphosphinoyl carboxylic acid-doped polyaniline and shape memory polyurethane were prepared. Coaxial electrospinning technology was introduced to combine the two and create the fibrous materials with the fiber wall constructed from HPPA-SMPU, encapsulating the interior RNI solution. The fibers were incorporated into the epoxy coatings. RNI exhibited water-triggered AIE, Al3+-CHEF (chelation-enhanced fluorescence), and pH-responsive fluorescent properties to indicate infrared laser-targeted points of coating damages. The photothermal properties of HPPA-SMPU caused localized heating of the damaged coatings, reaching the phase transition temperature of epoxy and SMPU, leading to softening, expansion, shape memory behavior, and healing of the coating damages. The self-healing approaches enhanced the protective performance of the coatings for aluminum alloys, showcasing and extending the development of synergistic and intelligent functions in novel self-healing coating technologies. Note de contenu : - EXPERIMENTAL : Reagent description - Preparation of rhodamine naphthalimide - Preparation of 2-hydroxyphosphonyl carboxylic acid doped polyaniline (HPPA) - Preparation of photothermal shape memory composite polymer HPPA-SMPU - Preparation of electrospinning HPPA-SMPU@RNI core-sheath structure fiber - Preparation of HPPA-SMPU@RNI composite coatings - Characterization of material structure and morphology - Testing for fluorescence properties of RNI in response to coating damage - Evaluation of photothermal shape memory performance of HPPA-SMPU - Evaluation of photothermal self-healing performance of composite coatings - RESULTS AND DISCUSSION : Structural characterization of RNI and HPPA-SMPU - Characterization of HPPA-SMPU@RNI fibers - The fluorescence properties of RNI and its indication of coating damages - Photothermal shape memory performance of HPPA-SMPU - Photothermal self-healing behavior of composite coatings - Damage-indication and self-healing mechanism of coating damages DOI : https://doi.org/10.1007/s11998-023-000905-0 En ligne : https://drive.google.com/file/d/13z06vWc-NS6tpL__FToEg-SnEaAbffKf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41309 [article]

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A novel acrylate-PDMS composite latex with controlled phase compatibility prepared by emulsion polymerization / Weili Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1259-1269 Titre : A novel acrylate-PDMS composite latex with controlled phase compatibility prepared by emulsion polymerization Type de document : texte imprimé Auteurs : Weili Li, Auteur ; Wenjun Shen, Auteur ; Wei Yao, Auteur ; Jijun Tang, Auteur ; Jie Xu, Auteur ; Lei Jin, Auteur ; Jide Zhang, Auteur ; Zexiao Xu, Auteur Année de publication : 2017 Article en page(s) : p. 1259-1269 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Copolymère silicone acrylate Hydrophobie Latex Polymérisation en émulsion Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, a series of acrylate-polydimethylsiloxane (PDMS) composite latexes was prepared and studied systematically to find the factors that affect their performances. At first, the modified PDMS was synthesized to react with acrylate monomers and participate in free radical polymerization. Then, the modified PDMS was blended with acrylate monomers, and the acrylate-PDMS composite latexes with different formulas were obtained by emulsion polymerization. Because the blending monomers were constrained in the micelle, the two components were interconnected with each other by a covalent bond and the phase compatibility between the two components could be controlled well. Chemical constitution and the morphology of acrylate-PDMS composite latexes were confirmed by using FTIR spectroscopy, TEM, and SEM measurements, respectively. Thermophysics and heat resistance of the dried coatings based on acrylate-PDMS composite latexes were studied using DSC and TGA tests, respectively. Anticorrosion properties of the cured coatings based on acrylate-PDMS composite latexes were confirmed by potentiodynamic polarization test. With low surface tension, good toughness, excellent weather-proof properties, and good high and low temperature stability, the modified PDMS component can improve the performance of the traditional acrylate latex-based waterborne resin effectively, and the prepared acrylate-PDMS composite latexes can be used in heavy-duty anticorrosion applications. Note de contenu : - EXPERIMENT : Materials - Preparation of modified PDMS - Preparation of acrylate-PDMS composite latex - Coating procedure - Characterization - RESULTS AND DISCUSSION : FTIR measurement - Morphology measurements - Study on the influence of acrylate component on the properties of acrylate-PDMS composite latexes - Study on the influence of the modified PDMS on acrylate-PDMS composite latexes DOI : 10.1007/s11998-017-9923-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9923-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29626 [article]

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Study on a novel composite coating based on PDMS doped with modified graphene oxide / Jijun Tang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 2 (03/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 2 (03/2018) . - p. 375-383 Titre : Study on a novel composite coating based on PDMS doped with modified graphene oxide Type de document : texte imprimé Auteurs : Jijun Tang, Auteur ; Wei Yao, Auteur ; Weili Li, Auteur ; Jie Xu, Auteur ; Lei Jin, Auteur ; Jide Zhang, Auteur ; Zexiao Xu, Auteur Année de publication : 2018 Article en page(s) : p. 375-383 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Composites Dispersions et suspensions Essais de résilience Oxyde de graphène Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Réaction de couplage Réticulants Revêtements Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements:Peinture Silanes Sol-gel, Procédé Tétraéthoxysilane Thermocinétique Index. décimale : 667.9 Revêtements et enduits Résumé : The low surface activity of graphene oxide (GO) stemming from its large conjugated electronic structure can easily affect the dispersion behavior of GO-based polymer matrices. This significantly undermines the properties of the resulting composite materials. Therefore, in order to increase the GO surface activity for use in polymer-based composites, GO was modified using silane coupling agent which was then doped into polydimethylsiloxane (PDMS) polymer to prepare novel paints by sol–gel reaction strategy. The subsequent novel composite coatings based on PDMS/modified GO (mGO) were finally cured with tetraethoxysilane as the hardening agent in the presence of dibutyltin dilaurate catalyst. The effect of doping mGO into PDMS polymer was systematically studied using infrared spectroscopy, micro-Raman spectroscopy, TEM, SEM, XRD, TGA, mechanical test, thermal conductivity test, and the erosion resistance test. It was concluded that the phase compatibility between GO and PDMS was enhanced due to the new interconnecting chemical bonds brought about by the mGO in the composite. Note de contenu : - EXPERIMENTAL : Materials - Preparations of graphene oxide and chlorination of graphene oxide - Preparation of composite coatings - Characterization - RESULTS AND DISCUSSION : Materials characterization - Morphological analysis - Thermal stability property - Mechanical properties - Thermal conductivity - Anticorrosion property DOI : 10.1007/s11998-017-9991-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9991-9.pdf Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30296 [article]

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