![](./images/home.jpg)
![](./images/bar_spacer.gif)
Détail de l'auteur
Auteur Caili Yu |
Documents disponibles écrits par cet auteur
![](./images/expand_all.gif)
![](./images/collapse_all.gif)
![](./images/orderby_az.gif)
Imidization of styrene-maleic anhydride copolymer for dispersing nano-SiO2 in water / Tao Xue in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)
![]()
[article]
Titre : Imidization of styrene-maleic anhydride copolymer for dispersing nano-SiO2 in water Type de document : texte imprimé Auteurs : Tao Xue, Auteur ; Caili Yu, Auteur ; Zhongqun Zhou, Auteur ; Faai Zhang, Auteur Année de publication : 2023 Article en page(s) : p. 1867-1880 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents dispersants (chimie)
Analyse thermique
Caractérisation
Copolymère styrène-maléimide
Copolymères -- Synthèse
Dioxyde de silicium
Nanoparticules
Poids moléculaires
Solutions aqueuses (chimie)
ThermogravimétrieIndex. décimale : 667.9 Revêtements et enduits Résumé : Achieving functional styrene-maleic anhydride (SMA) copolymer dispersant is highly attractive but still remains a challenge. Conventional modified SMA dispersants have complex modification steps, poor performance, and limited applications. Thus, a series of styrene–maleimide (SMI) copolymers with different functionality as amphiphilic dispersants for dispersing nano-SiO2 in an aqueous solution were synthesized using a simple preparation process. The changes in the maleic anhydride groups during imidization were tracked using FTIR spectroscopy, 1H-NMR, and GPC. A rotational viscometer and an inverted bottle method were used to measure the viscosity and coagulation time of the nano-SiO2 aqueous dispersion system, respectively, after adding the SMI dispersants. The particle size, size distribution, and dispersant adsorption amount of the dispersion were analyzed using laser particle size analysis ; FTIR spectroscopy and SEM; and TGA, respectively. The results showed that the hydrogen bonds formed between the amino groups in the dispersant and the hydroxyl groups on the SiO2 surface during stirring allowed the dispersant to be adsorbed onto the SiO2 surface after being added to the nano-SiO2 aqueous system. The addition of the SMI dispersant enhanced the steric hindrance and electrostatic repulsion between the nanoparticles, thus making it possible for the SiO2 nanoparticles not to easily aggregate in water, improving their dispersity and stability. Additionally, the type and amount of SMI dispersant used significantly affected the SiO2 nanoparticles' ability to disperse in water. This makes SiO2 particles convenient to use and transport, not produce dust pollution, and easy to store. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of styrene–maleimide dispersants - Preparation of nano-SiO2 aqueous system - Characterization
- RESULTS AND DISCUSSION : Synthesis and characterization of the styrene-maleimide (SMI) copolymers - TGA analysis - DSC analysis - Dispersion of the nano-SiO2 aqueous system - Solubility of polymeric dispersant in different solvents
- Table 1 : Recipe and properties of SMI dispersant
- Table 2 : Molecular weight and PDI of SMA and SMI
- Table 3 : Solubility of polymers in different solventsDOI : https://doi.org/10.1007/s11998-023-00783-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00783-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40167
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1867-1880[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 24337 - Périodique Bibliothèque principale Documentaires Disponible Preparation and application of fluorine-containing acrylate emulsion in two-component waterborne polyurethane coatings / Aohuan Guo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)
![]()
[article]
Titre : Preparation and application of fluorine-containing acrylate emulsion in two-component waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Aohuan Guo, Auteur ; Jianben Xu, Auteur ; Caili Yu, Auteur ; Faai Zhang, Auteur Année de publication : 2024 Article en page(s) : p. 1311-1320 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fluoropolymères
Polyacrylates
Polymérisation en émulsion
Polyuréthanes
Résistance à l'humidité:Résistance à l'eau
Revêtements -- Propriétés mécaniques
Revêtements bi-composant
Revêtements en phase aqueuse
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Traditional two-component waterborne polyurethane (2K WPU) has low water resistance, which limits its application in the wide field. In this work, fluorine-modified 2K WPU films (2K-WFPUs) were successfully prepared using a fluorine-modified acrylate emulsion as hydroxyl component and a hydrophilically modified polyisocyanate as curing agent. Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy analysis indicate that hexafluorobutyl acrylate (HFBA) was successfully introduced into the 2K-WFPUs. The effects of HFBA content on the surface, thermal stability, water resistance, mechanical, and application properties of 2K-WFPUs were investigated. Compared with the unmodified film, with the increase in HFBA level from 0 to 8%, the static water contact angle of 2K-WFPUs increased from 66° to 92°, the surface-free energy decreased from 42.7 to 28.4 mJ m−2, the water absorption reduced from 15.9 to 9.9%. Thermogravimetric analysis shows that the thermal stabilities of 2K-WFPUs were improved remarkably. Meanwhile, adding HFBA did not weaken the impact resistance, flexibility, and adhesion of 2K-WFPUs and maintained the highest level. The fluorine-modified 2K WPU coatings have potential application in wood furniture and automotive finishing. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the fluorine-containing acrylate emulsion - Preparation of 2K-WFPUs - Characterization
- RESULTS AND DISCUSSION : Characterization of the emulsion - FTIR analysis - TGA analysis - DSC analysis - Surface analysis - Water resistance - Coating properties
- Table 1 : Feeding monomer mixture recipe for preparation of emulsion
- Table 2 : Mechanical and film properties of the 2K-WFPU coatingsDOI : https://doi.org/10.1007/s11998-023-00893-1 En ligne : https://drive.google.com/file/d/1bSiVfzJh9q7RBxYlzKJWwxD3GjMFwWv_/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41299
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1311-1320[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 24738 - Périodique Bibliothèque principale Documentaires Disponible