Multifunctional photoinitiators (MFPIs) : A new concept / R. Burrows in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B2 (06/2004)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B2 (06/2004) . - p. 127-135 Titre : Multifunctional photoinitiators (MFPIs) : A new concept Type de document : texte imprimé Auteurs : R. Burrows, Auteur ; R. Stephen Davidson, Auteur ; Derek R. Illsley, Auteur Année de publication : 2004 Article en page(s) : p. 127-135 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Calorimétrie Emballages Encre -- Séchage Encre d'imprimerie Extraction (chimie) Photoamorceurs (chimie) Produits chimiques -- Migration Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Silanes Spectroscopie infrarouge en temps réel Index. décimale : 667.9 Revêtements et enduits Résumé : The migration of unreacted photoinitiators and their by-products from UV-cured printing inks and coatings is an increasing concern for food packaging applications. This paper describes the synthesis of novel multifunctional photoinitiators (MFPI) for use in UV curing, with the aim of decreasing the amount of extractable components present in a UV-cured coating. The activity of these MFPIs was investigated using differential photocalorimetry (DPC) and real-time infrared spectroscopy (RTIR). These analytical techniques demonstrated that the increase in functionality and molecular weight of MFPIs did not affect the efficiency of the PI in initiating UV-curing polymerisation reactions. The extraction studies and high-performance liquid chromatography (HPLC) analysis demonstrated that the use of MFPI can bring about a considerable reduction in the amount of free PI extracted from the coating as the high functionality increased the likelihood of the PI being bound into the polymer coating. Note de contenu : - PREPARATIVE ROUTES TO MULTIFUNCTIONAL PHOTOINITIATORS : Preparation of aromatic ether-linked MFPI - Preparation of aromatic ester-linked MFPI - Preparation of aliphatic ester-linked MFPIs - Prepraation of amine-ene-linked MFPIs - Preparation of thiol-ene-linked MFPIs - SILANE CHEMISTRY DOI : 10.1007/BF02699607 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699607.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5473 [article]

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The diacetone acrylamide crosslinking reaction and its influence on the film formation of an acrylic latex / Nicola Kessel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 3 (09/2008)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 3 (09/2008) . - p. 285-297 Titre : The diacetone acrylamide crosslinking reaction and its influence on the film formation of an acrylic latex Type de document : texte imprimé Auteurs : Nicola Kessel, Auteur ; Derek R. Illsley, Auteur ; Joseph L. Keddie, Auteur Année de publication : 2008 Article en page(s) : p. 285-297 Note générale : Bibliogr. Langues : Américain (ame) Tags : Crosslinking  'Diacetone  acrylamide'  'Film  formation'  'Keto-hydrazide'  Surfactant Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne colloidal polymers (i.e. latex) represent a promising alternative to organic solvent-based systems in coatings applications. The development of mechanical strength and hardness is often enhanced by chemical crosslinking that creates a three-dimensional network. If extensive crosslinking occurs within the particles prior to their coalescence, however, interdiffusion will be prevented. A weaker product will result. We have explored the inter-relationship between coalescence, crosslinking, and surfactant exudation in an acrylic latex containing diacetone acrylamide exploiting the “keto-hydrazide” crosslinking reaction. The complementary use of spectroscopic techniques on a model system determined that the crosslinking reaction yields an imine, not an enamine as has been proposed in some literature. Gel fraction measurements were used to probe the rate and amount of crosslinking and identified a slower rate in larger particles, suggesting that the transport of crosslinking agent is rate-limiting. The keto-hydrazide reaction was found to be acid catalyzed and favored at lower water concentration. Measurement of the latex pH relative to the polymer mass fraction during film formation clarified the expected point of onset for crosslinking in relation to particle packing. Atomic force microscopy was used to follow surface leveling relative to the competing influence of crosslinking. The rate and total amount of surfactant exudation were found to be influenced by crosslinking, particle deformability (as determined by the temperature relative to the polymer glass transition temperature), and the evaporation rate (as controlled by the relative humidity). There is evidence that surfactant exudation can be triggered by the particle deformation that occurs at film formation temperatures well above the glass transition temperature. DOI : 10.1007/s11998-008-9096-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9096-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2973 [article]

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