In this paper, the 3D DLP printing of an epoxy-based material controlled by pyridine derivatives was investigated. The impact of the pyridine structure and concentration on the cationic polymerization kinetics was explored. An increase of the inhibition time and a decrease of the heat flow were observed and attributed to the trapping of the initiating species and the stabilization of the growing chains. This allows for the confinement of the polymerization process and limits the presence of lateral defects around the printed objects. Furthermore, the validity of the Jacobs law was discussed. Due to the photoinitiator photolysis, an increase in the penetration depth was observed in relation to the solidification delay. A model was developed to relate the change of the printed layer thickness to the applied light dose, taking this phenomenon into account. This led to a more precise determination of the critical energy.

中文翻译：

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提高阳离子槽光聚合的时空分辨率和可重复的层厚度


在本文中，研究了由吡啶衍生物控制的环氧树脂基材料的 3D DLP 打印。探讨了吡啶结构和浓度对阳离子聚合动力学的影响。观察到抑制时间的增加和热流的减少，这归因于起始物种的捕获和生长链的稳定。这允许限制聚合过程并限制打印对象周围横向缺陷的存在。此外，还讨论了雅各布斯法的有效性。由于光引发剂光解，观察到与凝固延迟相关的穿透深度增加。考虑到这一现象，开发了一个模型来将打印层厚度的变化与施加的光剂量联系起来。这导致了对临界能量的更精确测定。