As it had been shown that some covalently bound benzophenone (BP)—phenylglycine derivatives act as remarkable monomolecular Type II photoinitiators for radical polymerization, structural variations were investigated. The influence of the linking position between BP and the coinitiator and the coinitiator structure itself were considered. Furthermore, water soluble monomolecular BP-glycine based PIs were developed. While in UV-spectroscopy similar absorption behavior were found for all compounds, photo-DSC experiments revealed that derivative 2 has the most effective constitution.
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Jauk et al. (2008) studied this question.
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