Bi, Yubai published the artcileA Visible Light Initiating System for Free Radical Promoted Cationic Polymerization, Application In Synthesis of 2909-77-5, the publication is Macromolecules (1994), 27(14), 3683-93, database is CAplus.
A visible light initiator system (containing a xanthene dye, an aromatic amine, and a diaryliodonium salt) for the photoinduced cationic polymerization of epoxides is reported. The polymerization in the radicals generated from the visible-light absorber starts a chain process which, after oxidation of the formed radicals, produces a cationic chain initiating carbocation. The system can efficiently photoinitiate the polymerization of certain cyclic ethers at any wavelength of the visible spectrum depending on the dye’s absorption spectrum and its oxidation/reduction potentials. Epoxides do not polymerize in the absence of any of the 3 components or in the absence of light. Aromatic amines of low basicity containing ¦Á-Hs are the preferred coinitiators for the polymerization of cyclohexene oxide (I). Studies on photochem. reactions between each 2 of the 3 components demonstrate that both oxidative bleaching of the dye by the diaryliodonium salt and reductive bleaching by the aromatic amine contribute to ¦Á-amino radical formation. The radical formed can be easily oxidized into an ¦Á-aminocarbocation by an onium salt of proper potential. Characterization of the polymer formed from I indicates that all the xanthene dye and appreciable amounts of the aromatic amine are incorporated in the polymer. It is believed that the ¦Á-aminocarbocation initiates the ring opening cationic polymerization Dye mols. are incorporated into the polymer in chain-terminating processes.
Macromolecules published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C14H23N, Application In Synthesis of 2909-77-5.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia