Macrocyclic Photoinitiator Based on Prism[5]arene Matching LEDs Light with Low Migration

作者：Qiuyan Song, Kun Shang, Tanlong Xue, Zongcheng Wang, Di Pei, Shuai Zhao, Jun Nie, Yincheng Chang · 发表于：Macromolecular Rapid Communications · 年份：2021 · DOI：10.1002/marc.202100299 · 被引用次数：18 · 研究领域：Photopolymerization techniques and applications、Advanced Polymer Synthesis and Characterization、Photochromic and Fluorescence Chemistry

Abstract In this work, a naphthalene‐based macrocycle prism[5]arene (NP 5 OCH 3 ) is developed as a novel kind of photoinitiator. When NP 5 OCH 3 is irradiated under light, the bond between methylene and naphthalene can be quickly broken owning to the existence of ring tension. The macrocycle is cleaved to linear oligomer biradicals, which can effectively initiate the free radical photopolymerization of acrylate monomers. Compared with conventional photoinitiators, NP 5 OCH 3 has strong light absorption in the wavelength range of 365–405 nm, so it can well match the environment‐friendly light‐emitting diodes (LEDs) light source to realize highly efficient initiation. In addition, there is no small molecule fragment generated during NP 5 OCH 3 fracture, and the resulted linear oligomer biradicals can be immobilized in the polymer after initiating polymerization, so NP 5 OCH 3 photoinitiators show much lower migration rate and cytotoxicity. Cleavable macrocycle prismarene may provide a new idea for the design of safe and efficient photoinitiators matching long wavelength light.