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 Polymérisation
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Tags : |
'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 : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12175 |
in COLORATION TECHNOLOGY > Vol. 127, N° 5 (2011) . - p. 314-321