A study of acetoacetoxyethyl methacrylate hydrolysis in acrylic latex polymers as a function of pH / Kebede Beshah in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 6 (11/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 6 (11/2013) . - p. 821-828 Titre : A study of acetoacetoxyethyl methacrylate hydrolysis in acrylic latex polymers as a function of pH Type de document : texte imprimé Auteurs : Kebede Beshah, Auteur ; Wayne Devonport, Auteur Année de publication : 2013 Article en page(s) : p. 821-828 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Énamine Hydrolyse Latex Liants Méthacrylate d'acétoacétoxyéthyle pH Polyacryliques Réticulation (polymérisation) Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Acetoacetoxyethyl methacrylate (AAEM) is an ambient crosslinking monomer that, when incorporated into architectural coatings binders, provides coatings with improved hardness, scrub, stain, and dirt pick-up resistance. This study details the use of NMR spectroscopy to explore the hydrolysis profile of AAEM as a function of pH, type of neutralizer, and glass transition temperature of the binder. We have determined that AAEM has a hydrolysis profile that is independent of latex polymer pH relevant to coatings (pH 7–10). Lower T g latex polymers enable the diffusion of ammonia into the binder nanoparticles converting a larger amount of the acetoacetoxy moiety to the enamine form; this approach also allows for measuring the distribution of enamine and AAEM form in the latex polymer particle. The consequence of these findings is that AAEM may be utilized at a lower pH than previously envisioned without consequence to the hydrolysis profile of the acetoacetoxy functionality. Note de contenu : - 2D NMR signal assignment - Room temperature aging of high Tg latex polymer (Tg=38°C) - AAEM hydrolysis of high Tg (38°C) latex polymer neutralized by hard base (NaOH) - Room temperature aging of low Tg (7°C) latex polymer - Dependence of enamine formation Tg of the latex polymer DOI : 10.1007/s11998-013-9512-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9512-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19821 [article]

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Synthesis of a low-temperature self-crosslinking polyacrylate binder with a core-shell structure and its application in textile pigment printing / Xiaoyu Zhang in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 4 (08/2018) . - p. 299-307 Titre : Synthesis of a low-temperature self-crosslinking polyacrylate binder with a core-shell structure and its application in textile pigment printing Type de document : texte imprimé Auteurs : Xiaoyu Zhang, Auteur ; Yi Zhong, Auteur ; Xiaofen Sui ; Hong Xu ; Lingpin Zhang ; Zhiping Mao Année de publication : 2018 Article en page(s) : p. 299-307 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Auto-réticulation Basses températures Calorimétrie Composés organiques -- Synthèse Core-Shell Couches minces -- Propriétés mécaniques Essais dynamiques Fourier, Spectroscopie infrarouge à transformée de Impression sur étoffes Latex Liants Méthacrylate d'acétoacétoxyéthyle Microscopie électronique en transmission Polyacrylates Polymérisation en émulsion Thermogravimétrie Index. décimale : 667.3 Teinture et impression des tissus Résumé : A core‐shell acrylate binder for pigment printing containing acetoacetoxyethyl methacrylate (AAEM) in its shell was synthesised via semicontinuous seeded emulsion polymerisation. Self‐crosslinking occurs when curing at low temperatures without releasing formaldehyde. The core‐shell structure of the binder produces prints with a high block resistance and good film‐forming properties, which can avoid clogging the screens during the printing process and help to acquire a soft handle for textiles. Transmission electron microscopy (TEM) analysis demonstrated that the latex particle had a core‐shell structure of size ca. 120 nm. Differential scanning calorimetry (DSC) testing showed that polyacrylate (PA)‐modified AAEM exhibited two apparent Tg, providing further information about the formation of the soft core‐hard shell latex particles. Crosslinking degree tests, thermogravimetric analysis (TGA) and testing of the mechanical properties indicated that self‐crosslinking of AAEM took place at 100 °C, thereby enhancing the thermostability and mechanical properties of the latex films. The softer and non‐stick handle, excellent rubbing fastness, and higher K/S were obtained by further padding the printed fabric with amino silicon softener. The chemical structures of the surfaces of the printed fabrics were studied by Fourier Transform‐infrared (FTIR), and results confirmed that the crosslinking reaction between the amino of the softener and remaining acetoacetoxy functional group (AcAc) of AAEM had taken place. Note de contenu : - EXPERIMENTAL : Chemicals - Materials - Equipment - Synthesis of core-shell latex - Preparation of latex films - Preparation of latex film - Pigment printing - Measurement and analysis - RESULTS AND DISCUSSION : Polymerisation - Morphology - Thermal analysis - Mechanical properties - Pigment printing - After treatment DOI : 10.1111/cote.12339 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12339 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30925 [article]

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