Synthesis and Photopolymerization of Benzophenone Macromolecular Photoinitiators.

Two macromolecular photoinitiators PPI 1 and PPI 2 were synthesized and characterized. The results showed that the UV absorption behavior of PPI 1 and PPI 2 are similar to that of 4-BP, the molar extinction coefficient are higher, the rate of photodegradation are faster. Without the addition of EDAB, compared to PPI1 and PPI 2, as the molecular weight (functionality) of photoinitiator increased, the polymerization rate increased and the final double bond conversion rate of HDDA increased The extraction amount of film cured by PPI 1 was 44. 5% than that of 4-BP, PPI 2 was 40% than that of 4-BP respectively, after immersed in CH₂ Cl₂ solution for 5 days. [ABSTRACT FROM AUTHOR]