Diazobenzo[a]fluorene derivatives as visible photosensitizers for cationic polymerization

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• 作者：Karolina Podemska ; Rados艂aw Podsiad艂y ; Agnieszka Marzena Szymczak ; Ewa Chrze艣cija艅ska ; Jolanta Soko艂owska ; ^{jsokolow@p.lodz.pl}
• 关键词：Cationic polymerization ; Quantum yields of acid release ; Diazobenzo[a]fluorene dyes ; Onium salts ; Electron transfer process ; Cyclohexene oxide
• 刊名：Dyes and Pigments
• 出版年：2012
• 期刊代码：31_01437208
• 类别：ms
• 出版时间：October, 2012
• 卷：95
• 期：1
• 页码：74-78
• 文件大小：368 K

摘要

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聽鈭捨?em>G_el. A linear relationship between the quantum yields of acid release 桅(H⁺) and the conversion of CHO is observed.