In this study, a new generation of photoinitiator (PI) based on hybrid structures combining benzophenone and triphenylamine is proposed. Remarkably, these photoinitiators (noted monofunctional benzophenone‐triphenylamine (MBP‐TPA) and trifunctional benzophenone‐triphenylamine (TBP‐TPA)) are designed and developed for the photopolymerization under light‐emitting diodes (LEDs). Benzoyl substituents connected with triphenylamine moiety contribute to the excellent absorption properties which results in both high final conversions and polymerization rates in free radical photopolymerization (FRP). Remarkably, TBP‐TPA owning trifunctional benzophenone group exhibits a better Type II PI behavior than well‐known 2‐isopropylthioxanthone for photopolymerization under LED@365 and 405 nm irradiation. FRP and cationic photopolymerization of TBP‐TPA‐based systems are applied on 3D printing experiments, and good profiles of the 3D patterns are observed. The high molecular weight of TBP‐TPA associated with it trifunctional character can also be very interesting for a better migration stability of PIs that is a huge challenge. The development of this new generation of photoinitiators based on benzophenone hybrid structures is a real breakthrough. It reveals that the novel versatile photoinitiators based on benzophenone‐triphenylamine hybrid structures have great potentials for future industrial applications (e.g., 3D printing, composites, etc.).

中文翻译：

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基于苯甲酮-三苯胺杂化结构的新型光引发剂用于LED光聚合。

在这项研究中，提出了一种基于结合了二苯甲酮和三苯胺的混合结构的新一代光引发剂（PI）。值得注意的是，这些光引发剂（称为单官能二苯甲酮-三苯胺（MBP-TPA）和三官能二苯甲酮-三苯胺（TBP-TPA））是为在发光二极管（LED）下进行光聚合而设计和开发的。与三苯胺部分连接的苯甲酰基取代基具有出色的吸收性能，可导致自由基光聚合（FRP）的高最终转化率和聚合速率。值得注意的是，在LED @ 365和405 nm照射下，具有三官能二苯甲酮基团的TBP-TPA在光聚合方面表现出比众所周知的2-异丙基噻吨酮更好的II型PI行为。基于TBP‐TPA的系统的FRP和阳离子光聚合可用于3D打印实验，并观察到3D图案的良好轮廓。TBP-TPA的高分子量及其三功能特性对于提高PI的迁移稳定性也非常有趣，这是一个巨大的挑战。基于二苯甲酮杂化结构的新一代光引发剂的开发是一个真正的突破。结果表明，基于二苯甲酮-三苯胺杂化结构的新型多功能光引发剂在未来的工业应用（例如3D打印，复合材料等）中具有巨大的潜力。TBP-TPA的高分子量及其三功能特性对于提高PI的迁移稳定性也非常有趣，这是一个巨大的挑战。基于二苯甲酮杂化结构的新一代光引发剂的开发是一个真正的突破。结果表明，基于二苯甲酮-三苯胺杂化结构的新型多功能光引发剂在未来的工业应用（例如3D打印，复合材料等）中具有巨大的潜力。TBP-TPA的高分子量及其三功能特性对于提高PI的迁移稳定性也非常有趣，这是一个巨大的挑战。基于二苯甲酮杂化结构的新一代光引发剂的开发是一个真正的突破。结果表明，基于二苯甲酮-三苯胺杂化结构的新型多功能光引发剂在未来的工业应用（例如3D打印，复合材料等）中具有巨大的潜力。