3D printable biopolymer nanocomposites composed of hydroxyapatite nanoparticles and functionalized plant-based monomers demonstrate potential as sustainable and structural biomaterials. To increase this potential, their printability and performance must be improved. For extrusion-based 3D printing, such as Direct Ink Writing (DIW), printability is important for print fidelity. In this work, triglycerol diacrylate (TGDA) was added to an acrylated epoxidized soybean oil:polyethylene glycol diacrylate resin to increase hydrogen bonding. Greater hydrogen bonding was hypothesized to improve printability by increasing the ink's shear yield strength, and therefore shape holding after deposition. The effects of this additive on material and mechanical properties were quantified. Increased hydrogen bonding due to TGDA content increased the ink's shear yield stress and viscosity by 916% and 27.6%, respectively. This resulted in improved printability, with best performance at 3 vol% TGDA. This composition achieved an ultimate tensile strength (UTS) of 32.4 ± 2.1 MPa and elastic modulus of 1.15 ± 0.21 GPa. These were increased from the 0 vol% TGDA composite, which had an UTS of 24.8 ± 1.8 MPa and a modulus of 0.88 ± 0.06 GPa. This study demonstrates the development of bio-based additive manufacturing feedstocks for potential uses in sustainable manufacturing, rapid prototyping, and biomaterial applications.

中文翻译：

---

二丙烯酸三甘油酯对紫外光固化生物基纳米羟基磷灰石复合材料适印性和性能的影响

由羟基磷灰石纳米粒子和功能化植物单体组成的 3D 打印生物聚合物纳米复合材料显示出作为可持续和结构生物材料的潜力。为了增加这种潜力，必须提高它们的印刷适性和性能。对于基于挤出的 3D 打印，例如直接墨水书写 (DIW)，适印性对于打印保真度非常重要。在这项工作中，将二丙烯酸三甘油酯（TGDA）添加到丙烯酸酯化环氧化大豆油：聚乙二醇二丙烯酸酯树脂中以增加氢键。假设更大的氢键可以通过增加油墨的剪切屈服强度来改善印刷适性，从而提高沉积后的形状保持性。量化了该添加剂对材料和机械性能的影响。由于TGDA 含量而增加的氢键使油墨的剪切屈服应力和粘度分别增加了916% 和27.6%。这提高了印刷适性，在 3 vol% TGDA 下具有最佳性能。该组合物的极限拉伸强度 (UTS) 为 32.4 ± 2.1 MPa，弹性模量为 1.15 ± 0.21 GPa。这些是从 0 vol% TGDA 复合材料中增加的，该复合材料的 UTS 为 24.8 ± 1.8 MPa，模量为 0.88 ± 0.06 GPa。这项研究展示了生物基增材制造原料的开发，其在可持续制造、快速原型制作和生物材料应用中的潜在用途。