Abstract
In this study, novel visible light one-component photoinitiators (BPN-D, BPN-Ph, BPN-N, BPN-An and BPN-Py), based on benzophenone scaffold have been synthesized. Compared to the reference samples (BPN and EMK), these new photoinitiators not only contribute to red-shifted UV–Vis absorption regions but also strongly enhance the thermal properties. The free radical generation in one-component Type II photoinitiators were also confirmed by the electron spin resonance (ESR) and steady-state photolysis techniques, and their chemical reaction mechanisms were also discussed. Finally, a photopolymerization studied using those novel and reference photoinitiators as one-component Type II photoinitiator was performed. The photopolymerization of TMPTMA monomer initiated by various photoinitiators was monitored by photo-DSC experiment. Under UV lamp irradiation, the BPN-Ph compound could be promoted with the highest double bond conversion efficiency up to 30%, which was higher than the reference BPN (25%) and EMK (22%) based photoinitiating systems. In addition, the BPN-An based formulation exhibited highest double conversion efficiency (22%) upon LED@405 nm. The experimental results show that the synthesized compounds can effectively improve photosensitivity as well as enhanced their optical and thermal properties.
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