Nowadays, photopolymerization has spanned across all academic and industrial applications due to its appealing features such as energy saving, environmentally-friendly polymerization conditions, high monomer conversions, rapid polymerization kinetics and so on. Photoinitiator (PI), as a crucial component of the photoinitiating system (PIS) are capable of interacting with light efficiently, enabling to generate initiating species in mono or multicomponent systems. In this work, 13 phenothiazine-based oxime esters (OXEs) (never reported before) were synthesized and their photoinitiation abilities for the free radical photopolymerization (FRP) of acrylates were examined upon irradiation with LED@405 nm. Parallel to their photochemical reactivities, their abilities to initiate thermal polymerization processes were also investigated. Finally, these OXEs exhibited excellent photo/thermal initiation performances, demonstrating their dual initiation properties. Phenothiazine-based oxime esters can be used as PIs in 3D printing as well as thermal initiator in the manufacturing of carbon fiber composites.

中文翻译：

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硝基吩噻嗪基肟酯作为3D打印光/热双引发剂的制备


如今，光聚合以其节能、聚合条件环保、单体转化率高、聚合动力学快等吸引人的特点，已遍及所有学术和工业应用。光引发剂（PI）作为光引发系统（PIS）的重要组成部分，能够有效地与光相互作用，从而能够在单组分或多组分系统中产生引发物质。在这项工作中，合成了 13 种基于吩噻嗪的肟酯 (OXE)（以前从未报道过），并在 LED@405 nm 照射下检查了它们对丙烯酸酯自由基光聚合 (FRP) 的光引发能力。与它们的光化学反应性平行，还研究了它们引发热聚合过程的能力。最后，这些 OXE 表现出优异的光/热引发性能，展示了它们的双重引发特性。吩噻嗪基肟酯可用作 3D 打印中的 PI，以及碳纤维复合材料制造中的热引发剂。