Preparation and characterization of waterborne polyurethane/polyacrylate emulsions containing sulfonate groups / Xiaorong Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1217-1227 Titre : Preparation and characterization of waterborne polyurethane/polyacrylate emulsions containing sulfonate groups Type de document : texte imprimé Auteurs : Xiaorong Wang, Auteur ; Guoyan Ma, Auteur ; Minyan Zheng, Auteur Année de publication : 2018 Article en page(s) : p. 1217-1227 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Emulsifiants Energie de surface Groupement carboxyle Groupement sulfonate Haut extrait sec Polyacrylates Polymères en émulsion Polyuréthanes Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Polyurethane/polyacrylate emulsions (SDPUA) with high solid content were obtained by using carboxyl groups and sulfonate groups as hydrophilic chain-extenders and internal emulsifiers through surfactant-free emulsion polymerization. Polyurethane/polyacrylate emulsions with ethylene diamine (EDA) as chain-extender (EDPUA) were also prepared. The influence of the different 2,4-diamino-benzenesulfonic acid sodium salt (DABS) content on the properties of the SDPUA products was investigated. The main properties of EDPUA were also discussed compared with the SDPUA samples. Dynamic light scattering results showed that when DABS/DMPA molar ratios increased from 1/4.7 to 1/2.28, the particle size increased from 72.2 to 99.7 nm. The particle size of EDPUA emulsion was larger. The steady rheological measurements illustrated that the viscosity decreased with the shear rate increase and the emulsions were displayed as pseudoplastic behavior. Attenuated total reflection Fourier transform infrared results demonstrated the SDPUA products were successfully prepared. As the function of DABS groups, the thermal stability was enhanced. With the increment in DABS/DMPA molar ratio, the contact angles on SDPUA membranes decreased, and the surface free energies increased. The T-peel strength increased to 88.2 N/mm and DABS/DMPA molar ratio increased to 1/2.28, and it was larger than the EDPUA samples. The compatibility of the dual phases was enhanced. Note de contenu : - EXPERIMENTAL : Materials - Preparation of SDPUA composite emulsions - Characterization - RESULTS AND DISCUSSION : Effect of DABS/DMPA molar ratios on the properties of SDPUA samples - Effect of EDA content on the properties of EDPUA samples DOI : 10.1007/s11998-018-0062-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0062-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31332 [article]

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Synthesis of waterborne curing agent and its applications in waterborne polyurethane adhesives / Guoyan Ma in SURFACE COATINGS INTERNATIONAL, Vol. 105.5 (09-10/2022)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 105.5 (09-10/2022) . - p. 360-364 Titre : Synthesis of waterborne curing agent and its applications in waterborne polyurethane adhesives Type de document : texte imprimé Auteurs : Guoyan Ma, Auteur ; Le Wang, Auteur ; Chengjun Wang, Auteur ; Weibo Wang, Auteur ; Xi Li, Auteur ; Lu Li, Auteur ; Xiaorong Wang, Auteur Année de publication : 2022 Article en page(s) : p. 360-364 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésifs en phase aqueuse Polymères en émulsion Polyuréthanes Résistance au pelage Réticulants -- Synthèse Réticulation (polymérisation) Rhéologie Temps de séchage Index. décimale : 667.9 Revêtements et enduits Résumé : A novel waterborne curing agent (SWCA) is obtained by the reaction of isophorone diisocyanate (IPDI), poly(propylene glycol) (PPG) and pentaerythritol (PE). Different quantities of SWCA were added to a waterborne polyurethane (WPU) to form a SWCA-modified WPU emulsion (SWPU). The structure of SWCA is characterised by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The effect of SWCA content on the initial tack, peel strength, solvent resistance and curing time are illustrated by T-peel strength, solvent resistance and curing time tests. The rheological properties of SWPU were assessed. The absorption peak at 2263 cm-1 in the ATR-FTIR spectra shows that -NCO groups exist in SWCA. While the content of the curing agent increased from 0% to 4%, the initial strength increased from 1.82 N/mm to 3.87 N/mm; the final peel strength increased from 5.02 N/mm to 7.08 N/mm; and the water and ethanol absorption rate decreased from 11.3% to 6.14% and 15.38% to 11.52%, respectively. The curing time of the SWPU adhesives decreased with increasing curing temperature. The rheological test shows the SWPU emulsion exhibits elastic behaviour. Note de contenu : - EXPERIMENTAL : Materials - Preparation of waterborne curing - Addition of SXCA to WPU - Characterisation - RESULTS AND DISCUSSION : ATR-FTIR spectroscopy of the curing agent SWCA and SWPU - Nuclear magnetic resonance spectrum of SWCA - Adhesion properties of WPU with different curing agent content - Effect of SWCA content on the solvent uptake rate of the SWPU films - Curing time of the SWPU adhesive - Rheological behaviour of the SWPU and WPU emulsions - Table 1 : Curing time of SWPU adhesives with different curing agent content adn different temperature En ligne : https://drive.google.com/file/d/1YiG6P8bY-NuiJ7ML0fWPqMtMtiop4JDY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38297 [article]

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Towards gradient structures in fluorinated acrylate and polyacrylate blend emulsions / Zhaoxia Yin in SURFACE COATINGS INTERNATIONAL, Vol. 101.4 (08-09/2018)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 101.4 (08-09/2018) . - p. 210-214 Titre : Towards gradient structures in fluorinated acrylate and polyacrylate blend emulsions Type de document : texte imprimé Auteurs : Zhaoxia Yin, Auteur ; Yiding Shen, Auteur ; Guoyan Ma ; Xiaorong Wang ; Hua Xin ; Mu Liu Année de publication : 2018 Article en page(s) : p. 210-214 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Analyse thermique Caractérisation Energie de surface Fluoropolymères Granulométrie Polyacrylates Polymères en émulsion Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : The effect of film formation temperature on the internal structure of self-organised films of fluoroacrylate/polyacrylate emulsions is described. Six fluorinated polyacrylate emulsions bearing varying fluorinated monomers were prepared and blended with the same polyacrylate emulsion. The blends were dried at 30°C, 45°C and 60°C. The minimum film formation temperature (MFFT) was tested by the MFFT-BAR-60 model instrument. The surface properties and morphologies of the blends on both the film-air (F.-A) and the film-glass (F-G) interfaces were characterised by contact angle, particle size distribution and scanning electron microscopy. The elemental composition and structure of films across the section were analysed by scanning electron microscope with energy dispersive X-ray spectroscopy (SEM-EDX) and X-rayphotoelectron spectra (XPS) analysis. Note de contenu : - EXPERIMENTAL : Materials - Preparation of blended emulsions - Characterisation - RESULTS AND DISCUSSION : ATR-FTIR spectroscopy of BE-1 and BE-6 - Particle size distribution - DSC analysis of sample films - Surface free energy measurements - Fractured surface morphology of BE-1 film - SEM-EDX spectrogram - XPS spectra of the emulsion surface - TABLES : 1. Sample designation and composition of the fluorinated acrylate emulsions - 2. Summary of Tg and MFFT results for samples 1-7 - 3. Surface free energies of BE1-6 films at different film formation temperatures - FIGURES : 1. ATR-FTIR spectar of BE-1 and BE-6 - 2. Particle size and distribution of emulsions sample 1, 3, 7 and BE-1 and BE-6 - 3. DSC thermograms of different samples - 4. The fractured surfacemorphology of the BE-1 film at different film formation temperatures - 5. SEM-EDX spectra of F distribution at fractured section of BE-1 film at difference film formation temperatures - 6. XPS spectra of F-G and F-A of BE-1 film at different temperatures and pattern of the fitting peak treatment for the XPS spectra of C 1s signals for the F-G interface at 60°C En ligne : https://drive.google.com/file/d/1z08THNPC3a9XbAC_4hCbnct5tyoxN1wg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30939 [article]

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