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ORGANOMETALLIC CATIONIC PHOTOINITIATORS
Authors: Vališ Jan | Jašúrek Bohumil | Remenárová Katarína | Weidlich Tomáš
Year: 2008
Type of publication: článek v odborném periodiku
Name of source: Chemické listy
Publisher name: Česká společnost chemická
Place: Praha
Page from-to: 1026-1028
Titles:
Language Name Abstract Keywords
cze Organokovové kationtové fotoiniciátory Pomocí UV-VIS spektroskopie byl sledován fotorozpad organokovových komplexů. Byly získány spektra 2x10-4 M roztoku iniciátorů v acetonitrilu a sledován úbytek pásu 245 nm po ozáření vysokotlakou rtuťovou výbojkou. Byly stanoveny extinkční koeficienty a energie nutné k dosažení 50% konverze. Účinnost polymerace byla sledována FTIR spektroskopií ve vinyletherovém a epoxidovém monomeru. kationtový fotoiniciátor, UV polymerace, UV-VIS spektroskopie
eng ORGANOMETALLIC CATIONIC PHOTOINITIATORS Several arene-iron complexes ((5-2,4-cyclopentadien-1-yl)[(1,2,3,4,5,6-)-arene] ferrous hexafluorophosphate) were tested as photoinitiators for cationic polymerization. The UV light decomposes arene-ironcyclopentadienyl (arene-Fe+Cp) cation selectively to the corresponding aromatic compound and iron cyclopentadiene (CpFe+) cation. Structure of aromatic compound affects decomposition upon UV light. FeCp+ formed during irradiation is active species for cationic polymerization. Decomposition of arene-iron initiators upon UV light was followed by UV-VIS spectroscopy. It was measured the decrease of absorption band at about 245 nm after irradiation 2∙10-4 M solution in acetonitrile. Super pressure mercury lamp was used as source of UV radiation. Extinction coefficients and energies need for achieving 50% conversion were calculated for all initiators. Efficiency of polymerization initiatiation was followed by FTIR spectroscopy in vinylether and epoxide monomers. Results from FTIR showed that most of prepared organometallic photoinitiators can be used for initiation cationic UV polymerization with similar efficiency as commercial initiator Irgacure 261. cationic photoinitiator;UV polymerization;UV-VIS spectroscopy

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