The carbazole-bound ferrocenium salt as a specific cationic photoinitiator upon near-UV and visible LEDs (365–405 nm) - Archive ouverte HAL
Article Dans Une Revue Polymer Bulletin Année : 2015

The carbazole-bound ferrocenium salt as a specific cationic photoinitiator upon near-UV and visible LEDs (365–405 nm)

Résumé

A carbazole-bound ferrocenium salt [i.e., (η6-Carbazole) (η5-cyclopentadienyl) iron hexafluorophosphate—FS] is proposed as an efficient photoinitiator for the cationic ring-opening polymerization of epoxides under air upon the exposure to a near-UV LED at 385 nm or a visible LED at 405 nm. When using this ferrocenium salt FS (0.2 wt%)/diphenyliodonium hexafluorophosphate or FS (0.2 wt%)/diphenyliodonium hexafluorophosphate/N-vinylcarbazole, final epoxide conversions of 55–66 % can be obtained after 800 s of irradiation at 385 or 405 nm. Reference cationic photoinitiators (i.e., diphenyliodonium hexafluorophosphate; 9-(4-hydroxyethoxyphenyl) thianthrenium hexafluorophosphate and triphenylsulfonium hexafluorophosphate) are unable to initiate the epoxide polymerization under the same conditions. The photochemical mechanisms for the formation of the initiating species are studied using steady-state photolysis, cyclic voltammetry, laser flash photolysis and electron spin resonance spin-trapping techniques. Molecular orbital calculations help to describe the absorption properties and the initiation step. The performance attained when using FS alone is really promising for applications under soft near-UV or visible light-emitting diode irradiation.

Domaines

Matériaux
Fichier non déposé

Dates et versions

hal-01407228 , version 1 (01-12-2016)

Identifiants

Citer

Jing Zhang, Damien Campolo, Frederic Dumur, Pu Xiao, Jean-Pierre Fouassier, et al.. The carbazole-bound ferrocenium salt as a specific cationic photoinitiator upon near-UV and visible LEDs (365–405 nm). Polymer Bulletin, 2015, 73, pp.493. ⟨10.1007/s00289-015-1506-1⟩. ⟨hal-01407228⟩
45 Consultations
0 Téléchargements

Altmetric

Partager

More