Journal
DYES AND PIGMENTS
Volume 95, Issue 1, Pages 74-78Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2012.03.016
Keywords
Cationic polymerization; Quantum yields of acid release; Diazobenzo[a]fluorene dyes; Onium salts; Electron transfer process; Cyclohexene oxide
Funding
- National Science Center in Cracow, Poland [N N209 032840]
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Photoredox pairs consisting of dyes based on diazobenzo[a]fluorene derivatives and commercially available onium salts (diaryliodonium and triphenylsulfonium salts) are tested as effective initiator systems for the cationic polymerization of cyclohexene oxide using visible light. The efficiency of these initiator systems is discussed based on the free energy change for the electron transfer from examined dyes to the onium compounds. The most efficient sensitizers are the dyes with the lowest oxidation potential and the highest -Delta G(el). A linear relationship between the quantum yields of acid release Phi(H+) and the conversion of CHO is observed. (C) 2012 Elsevier Ltd. All rights reserved.
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