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Photoinitiators and photoinitiation, 12 . The aromatic ketone/ t ‐amine Type‐II photoinitiating system. Identification of the initiating species
Author(s) -
Hageman Hendrik J.
Publication year - 1997
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.1997.030180512
Subject(s) - benzophenone , photochemistry , ketone , photoinitiator , amine gas treating , chemistry , dimethylaniline , substrate (aquarium) , photopolymer , reaction mechanism , excited state , polymer chemistry , organic chemistry , catalysis , polymerization , polymer , physics , oceanography , monomer , geology , nuclear physics
The system benzophenone/ N , N ‐dimethylaniline (DMA) representing a typical Type‐II photoinitiating system is irradiated in the presence of 1,1‐di( p ‐tolyl)ethylene (DTE) as a non‐polymerising model substrate. In the presence of DMA the excited triplet state of benzophenone is not quenched by DTE and N ‐[3,3‐di( p ‐tolyl)propyl]‐ N ‐methylaniline is isolated as the major product, indicating the DMA derived radical as the main initiating species in such Type‐II systems. The mechanism of the reaction and its implications are discussed.