Abstract With the aim of developing a low-cost and efficient visible-light-driven photocatalyst for radical polymerization, iron-chelating polyimide networks (Fe@MPI) was fabricated by firstly synthesizing photoactive melamine-containing polyimide (MPI) networks and then incorporating Fe(III) cations into the polymer networks. Fe@MPI exhibits a wide absorption spectrum ranging from 220 to 1250 nm and 3.5 times higher photocurrent intensity as compared with the pristine MPI. Based on its excellent photo-electric properties, Fe@MPI was employed as a recyclable heterogeneous catalyst, providing sufficient activity for the visible-light driven radical polymerization to synthesize poly(methyl methacrylate) with molecular weight up to 31.3 × 104 g/mol. Taking advantage of the heterogeneous nature of the catalyst, Fe@MPI could be facilely regenerated from the polymerization solution by filtration without an obvious loss of its activity. This research provides a novel recyclable catalyst for visible-light driven radical polymerization.

中文翻译：

---

一种新型铁螯合聚酰亚胺网络作为可见光驱动的光诱导自由基聚合催化剂

摘要 为了开发一种低成本、高效的可见光驱动的自由基聚合光催化剂，首先合成光活性的含三聚氰胺聚酰亚胺（MPI）网络，然后再掺入铁螯合聚酰亚胺网络（Fe@MPI）。 (III) 阳离子进入聚合物网络。与原始 MPI 相比，Fe@MPI 表现出从 220 到 1250 nm 的宽吸收光谱和高 3.5 倍的光电流强度。基于其优异的光电性能，Fe@MPI被用作可回收的多相催化剂，为可见光驱动的自由基聚合合成分子量高达31.3×104 g/mol的聚甲基丙烯酸甲酯提供了足够的活性。利用催化剂的多相性质，Fe@MPI 可以通过过滤从聚合溶液中轻松再生而不会明显损失其活性。该研究为可见光驱动的自由基聚合提供了一种新型的可回收催化剂。