Curing Characteristics of a Photopolymer Resin with Dispersed Glass Microspheres in Vat Polymerization 3D Printing
Curing Characteristics of a Photopolymer Resin with Dispersed Glass Microspheres in Vat Polymerization 3D Printing
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DOI：
10.1021/acsapm.3c01479
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发表时间：
2023-10
影响因子：
5
通讯作者：
Jingyu Liang;Mathieu Francoeur;Christopher B. Williams;Bart Raeymaekers
中科院分区：
文献类型：
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作者：
Jingyu Liang;Mathieu Francoeur;Christopher B. Williams;Bart Raeymaekers
光聚合物树脂的固化特性决定了还原聚合（VP）工艺参数与三维（3D）打印样品的层厚、几何精度和表面粗糙度之间的关系。将填充材料分散到光聚合物树脂中以改变试样的性质会改变固化特性，因为填充材料会散射、吸收和透射光，从而改变光聚合反应。然而，固化具有高填充体积分数的光聚合物树脂的能力对于特定应用的3D打印样品非常重要，例如用于生物和高温环境的复合材料和陶瓷材料。我们特别考虑了一种半透明填料，并系统地测量了分散半透明玻璃微球的二丙烯酸酯/环氧光聚合物树脂的固化特性。实验将固化深度、固化程度、几何精度和表面粗糙度与暴露剂量、填料分数和填料尺寸分布联系起来。固化深度取决于两种相互竞争的效应：光散射和光通过半透明填料的透射，并且在低暴露剂量下，固化深度随着填料分数的增加而增加，这与其他不透明填料对VP的结果形成对比。此外，在恒定的暴露剂量下，固化程度随填料分数的增加而增加。3D打印试样的几何精度和表面粗糙度随暴露剂量和填料含量的增加而降低。这项工作对工程材料制造中高填充率光聚合物树脂的VP具有指导意义。
The curing characteristics of a photopolymer resin determine the relationship between the vat polymerization (VP) process parameters and the layer thickness, geometric accuracy, and surface roughness of the three-dimensional (3D) printed specimens. Dispersing a filler material into the photopolymer resin to modify the properties of the specimens changes the curing characteristics because the filler scatters, absorbs, and transmits light, which alters the photopolymerization reaction. However, the ability to cure the photopolymer resin with a high filler volume fraction is important to 3D print specimens for specific applications, such as composite and ceramic materials for biological and high-temperature environments. We specifically consider a translucent filler and methodically measure the curing characteristics of a diacrylate/epoxy photopolymer resin with dispersed translucent glass microspheres. Experiments relate the curing depth, degree-of-cure, geometric accuracy, and surface roughness to the exposure dose, filler fraction, and filler size distribution. The curing depth depends on two competing effects: light scattering and light transmission through the translucent filler, and it increases with increasing filler fraction for low exposure dose, which contrasts results documented by others for VP with an opaque filler. Furthermore, the degree-of-cure increases with increasing filler fraction for a constant exposure dose. The geometric accuracy and surface roughness of the 3D printed specimens decrease with increasing exposure dose and filler fraction. This work has implications for VP of photopolymer resins with high filler fraction in the context of manufacturing of engineered materials.