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N-methylpicolinium esters as co-initiators in dye photosensitiser systems for the polymerisation of acrylate monomers / Janina Kabatc in COLORATION TECHNOLOGY, Vol. 127, N° 5 (2011)
[article]
Titre : N-methylpicolinium esters as co-initiators in dye photosensitiser systems for the polymerisation of acrylate monomers Type de document : texte imprimé Auteurs : Janina Kabatc, Auteur Année de publication : 2011 Article en page(s) : p. 314-321 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages.
Colorants
Photosensibilisants
PolymérisationTags : 'Esters N-méthy picolinium' 'Co-initiateurs' Photosensibilisateur Acrylates Polymérisation Photoinitiation Colorants Index. décimale : 667.3 Teinture et impression des tissus Résumé : The photoinitiation ability of several dyeing photoinitiating systems composed of positively charged N,N’-diethylthiacarbocyanine iodide and 3-ethyl-2-(p-N,N-dimethylaminostyryl)benzothiazolium iodide acting as light absorbers, n-butyltriphenylborate anion being the electron donor, and diphenylacetic acid (N-methylpyridinium)methyl ester cation acting as a ground state electron acceptor are compared. Both co-initiators in the polymerising formulations were present, either as tetrabutylammonium salt and diphenylacetic acid (N-methylpyridinium)methyl ester perchlorate, respectively, or as an ion pair. The best photoinitiating ability was observed when the borate anion and diphenylacetic acid (N-methylpyridinium)methyl ester cation formed an ion pair. Modification of the ability of the photoinitiating system was concerned with the possibility of elimination of a diffusion process. This was achieved by synthesis of a properly designed dye-possessing diphenylacetic acid (N-methylpyridinium)methyl ester group. This dye, after electron transfer, forms an N-methylpicolinium derivative radical that fragments, forming an (N-methylpyridinium)methyl radical, organic acid anion and reduced dye. Finally, from a combination of either an N-methylpicolinium derivative or alkyltriphenylborate salts with a suitable sensitiser or a properly designed dye and alkyltriphenylborate salt, two radicals can be generated per one absorbed photon, thus enhancing the overall efficiency of the polymerisation. Note de contenu : Examples of the dye-sensitised polymerisation reactions : mechanism involved and efficiency of the reaction DOI : 10.1111/j.1478-4408.2011.00315.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00315.x/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12175
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