4-carboxybenzophenone—sulfur-containing carboxylic acid

In this section an illustrative discussion on kinetics of photopolymerization initiated via an intermolecular photoinduced electron transfer for a dye-tertiary aromatic amine initiating photo-redox couple [193] and for 4-carboxybenzophenone-sulfur-containing carboxylic acids initiating systems will be presented. 

Kinetic analysis gives additional information related to the reactivity of the free radicals obtained during the processes following a photoinduced electron transfer process. A variation in radical reactivity could be caused, for example, by their stability or their reactivity with monomer, as in the case of photoinitiation by 4-carboxybenzophenone-sulfur-containing carboxylic acid of free-radical polymerization [184]. 

Table 11. Photophysical and photochemical properties of sulfur-containing carboxylic acids tested as electron donors is 4-carboxybenzophenone-sensitized polymerization.

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