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Naphthoylenebenzimidazolone dyes as one‐component photoinitiators
Author(s) -
Strzelczyk Rafał,
Podsiadły Radosław
Publication year - 2017
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/cote.12266
Subject(s) - bifunctional , chemistry , polymerization , photochemistry , intermolecular force , polymer chemistry , radical , polymer , organic chemistry , molecule , catalysis
The appropriate substituents have been added to a 7 H ‐benzimidazo[2,1‐a]benz[de]isoquinolin‐7‐one skeleton in order to obtain a one‐component initiator system. The absorption, fluorescence, and electrochemical properties of these naphthoylenebenzimidazolone dyes and their usefulness as visible light initiators of free radical polymerisation of trimethylolpropane triacrylate were examined. The initiation efficiency of these dyes was compared with that of the parent 7 H ‐benzimidazo[2,1‐a]benz[de]isoquinolin‐7‐one in the presence of a coinitiator. Results show that these bifunctional dyes are able to initiate polymerisation without an additional coinitiator. Photopolymerisation studies and the relationship between the rate of polymerisation and the free energy change for electron transfer revealed that, depending on the concentration, initiating radicals are generated via intra‐ and intermolecular electron transfer.