A multifunctional photoinitiator is presented, offering precise control over light‐induced polymerization initiation at 450 nm and material degradation at 365 nm. This is accomplished by covalently linking photoactive bis(acyl)phosphane oxide and photocleavable o‐nitrobenzyl ether moieties onto the surface of γ‐cyclodextrin. Upon degradation, the resulting linear polymers can be easily re‐dissolved in their corresponding monomer and re‐cured, exhibiting superior mechanical properties compared to the pristine material. Moreover, this photoinitiator enables the successful 3D printing of intricate and precise structures, representing a promising general strategy for developing recyclable photoresins for 3D printing applications.

中文翻译：

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基于多功能光引发剂的可持续 3D 打印总体策略

提出了一种多功能光引发剂，可精确控制 450 nm 处的光引发聚合引发和 365 nm 处的材料降解。这是通过将光活性双（酰基）氧化膦和可光裂解的邻硝基苄基醚部分共价连接到 γ-环糊精的表面来实现的。降解后，所得线性聚合物可以很容易地重新溶解在相应的单体中并重新固化，与原始材料相比，表现出优异的机械性能。此外，这种光引发剂能够成功地3D打印复杂而精确的结构，代表了开发用于3D打印应用的可回收光树脂的有前途的总体策略。