Photochemical Study of a Three-Component Photocyclic Initiating System for Free Radical Photopolymerization: Implementing a Model for Digital Light Processing 3D Printing
Photochemical Study of a Three-Component Photocyclic Initiating System for Free Radical Photopolymerization: Implementing a Model for Digital Light Processing 3D Printing
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DOI：
10.1002/cptc.201900167
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发表时间：
2019-09-10
期刊：
影响因子：
3.7
通讯作者：
Allonas, Xavier
中科院分区：
文献类型：
--
作者：
Metral, Boris;Bischoff, Adrien;Allonas, Xavier
还原光聚合技术是增材制造领域有前途的3D打印技术，这需要高性能和负担得起的光引发系统（PIS）。本文介绍了一种以番红为光敏剂，加入两种氧化还原助剂的复合光催化剂。通过激光闪光光解（LFP）探索了光循环机理，并通过实时傅里叶变换红外光谱（RT-FTIR）研究了其反应性。提出了一个模型，该模型具有良好的精度预测转换与时间和光强的变化。进行固化深度实验，并建立所用树脂的临界能量（Ec）和穿透深度（Dp）。这些参数和相应的RT-FTIR结果之间的关系通过凝胶点处的转化作用突出显示，从而优化配方。最后，用树脂打印高分辨率的复杂零件，其组成根据我们的研究进行了定制，证明了这种PIS在数字光处理（DLP）3D打印中的可行性。
Vat photopolymerization technologies are promising 3D printing techniques in the field of additive manufacturing, which requires high performance and affordable photoinitiating systems (PIS). In this paper, we introduce a complex PIS based on safranine as photosensitizer and two redox additives. The photocycling mechanism is explored via laser flash photolysis (LFP) and its reactivity is investigated through real-time Fourier transform infrared spectroscopy (RT-FTIR). A model which predicts with good accuracy the change in conversion with both time and light intensity is proposed. Cure depth experiments are conducted and the critical energy (Ec) and penetration depth (Dp) are established for the resin used. The relationship between these parameters and the corresponding RT-FTIR results was highlighted through the role of the conversion at the gel point, allowing optimization of the formulation. Finally, high resolution complex pieces are printed with the resin, whose composition was tailored in accordance with our studies, demonstrating the viability of this PIS in digital light processing (DLP) 3D printing.