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Diethoxy‐azobis(pyridinium) Salt as Photoinitiator for Cationic Polymerization: Towards Wavelength Tunability by Cis–Trans Isomerization
Author(s) -
Durmaz Yasemin Yuksel,
Zaim Ömer,
Yagci Yusuf
Publication year - 2008
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200800070
Subject(s) - photoinitiator , cationic polymerization , photochemistry , polymerization , polymer chemistry , pyridinium , isomerization , photoisomerization , photopolymer , chemistry , monomer , cyclohexene oxide , homolysis , hexafluorophosphate , materials science , polymer , organic chemistry , copolymer , radical , ionic liquid , catalysis
N , N ′‐diethoxy‐4,4′‐azobis(pyridinium) hexafluorophosphate (DEAP) has been synthesized by alkylation of the corresponding N ‐oxide and characterized. DEAP exhibits UV induced cis–trans isomerization with absorptions at around λ = 459 and 360 nm, respectively. The ability of the DEAP ion to act as a photoinitiator for the cationic polymerization of cyclohexene oxide and N ‐vinylcarbazole is demonstrated. The initiation step involves the decay of the excited state of the trans form of the salt with homolytic bond rupture of the nitrogen–oxygen bond. Its potential use as a photoinitiator for free radical polymerization is also demonstrated using methyl methacrylate monomer as the example.