PHOTOINITIATORS/PHOTOSENSITIZERS

Photoinitiators or photosensitizers form initiating species for photopolymerization upon exposure to UV or visible light.  They further accelerate polymerzation in presence of coinitiators.  Most of them function by formation of free radicals but cationic photoinitiators form Lewis acids which initiate cationic polymerization. Examples include:

 

FREE-RADICAL PHOTOINITIATORS/PHOTOSENSITIZERS

Benzophenone

Benzil dimethyl ketal

Hydroxycyclohexyl phenyl ketone

Isopropylthioxanthone

Diethoxyacetophenone

Trimethylbenzoyldiphenyl phosphine

CATIONIC PHOTOINITIATORS

Triarylsulfonium hexafluoroantimonate salts

Diaryliodonium salts

 

 

 

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