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URN: urn:nbn:de:swb:90-464221
DOI: 10.1039/C4PY00418C
Zitationen: 15
Web of Science
Zitationen: 15

Studying the polymerization initiation efficiency of acetophenone-type initiators via PLP-ESI-MS and femtosecond spectroscopy

Frick, Elena; Ernst, Hanna A.; Voll, Dominik; Wolf, Thomas J. A.; Unterreiner, Andreas-Neil; Barner-Kowollik, Christopher

The initiation efficiency and the excited state dynamics of the three triplet radical photoinitiators MMMP (2-methyl-4[prime or minute]-(methylthio)-2-morpholinopropiophenone){,} benzoin (2-hydroxy-1{,}2-diphenylethanone{,} Bz){,} and 4-methyl benzoin (2-hydroxy-2-phenyl-1-(p-tolyl) ethanone{,} 4MB) are investigated via a trifold combination of pulsed laser polymerization and subsequent electrospray ionization mass spectrometry (PLP-ESI-MS){,} femtosecond transient absorption (TA) spectroscopy{,} and density functional theory (DFT) methods. A quantitative elucidation of the underlying mechanisms that cause unequal initiation efficiencies of the three photoinitiators is proposed suggesting higher radical formation capabilities for MMMP and 4MB compared to Bz based on the inherent photophysical properties of the three initiators. MMMP shows significantly higher complexity of the relaxation pathways due to partial excitation into higher singlet states as well as extended triplet lifetimes. However{,} Bz shows the highest initiation efficiency for polymerization of MMA at a wavelength of 351 nm compared to both MMMP (Bz : MMMP correspon ... mehr

Zugehörige Institution(en) am KIT Institut für Biologische Grenzflächen (IBG)
Institut für Baugestaltung (Inst. f. Baugest.)
Institut für Physikalische Chemie (IPC)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 1759-9954
KITopen ID: 1000046422
HGF-Programm 43.14.01; LK 01
Erschienen in Polymer Chemistry
Band 5
Heft 17
Seiten 5053-5068
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