3D printing of cellulose acetate (CA)-based, sustainable, thermally stable nanocomposites is challenging due to their fast drying, nozzle clogging, and complex rheological behavior. In this study, we developed an extrusion-printable ink based on CA and cellulose nanocrystals (CNCs) using a trisolvent wet blending method, followed by a postprinting pore-inducing processing technique. The nanocomposites performed well in both tensile- and compression-based mechanical tests. Moreover, the nanocomposites demonstrated malleable deformation during compression testing without any premature fracture, unlike commercial commodity plastics. The thermal stability was assessed using thermogravimetric analysis, showing a ∼ 28 °C improvement in the onset degradation temperature after the addition of 5 wt % CNCs. Solvent tolerance tests against various solvents indicated excellent solvent resistance. The lightweight nanocomposites showed no deterioration, even after long-term exposure to water vapor. Finally, the anticorrosion behavior of the samples was evaluated as a coating material for metal (Al), demonstrating excellent protection against corrosive acid vapors. Thus, the application of 3D-printed CA material exhibits significant promise for implementation in the fields of lightweight, sustainable, and anticorrosive engineering materials.

中文翻译：

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通过溶剂交换后处理 3D 打印高强度、热稳定、可持续的轻质耐腐蚀纳米复合材料


基于醋酸纤维素 （CA） 的可持续、热稳定的纳米复合材料的 3D 打印具有挑战性，因为它们干燥快、喷嘴堵塞和复杂的流变行为。在这项研究中，我们使用三溶剂湿法混合方法开发了一种基于 CA 和纤维素纳米晶体 （CNC） 的挤出打印油墨，然后是印后造孔加工技术。纳米复合材料在基于拉伸和压缩的机械测试中均表现良好。此外，与商业商品塑料不同，纳米复合材料在压缩测试期间表现出可塑性变形，没有任何过早断裂。使用热重分析评估热稳定性，显示添加 5 wt % CNC 后，起始降解温度提高了 ∼ 28 °C。对各种溶剂的溶剂耐受性测试表明具有出色的耐溶剂性。轻质纳米复合材料即使在长期暴露于水蒸气后也没有表现出劣化。最后，评估了样品作为金属 （Al） 涂层材料的防腐蚀性能，显示出对腐蚀性酸蒸气的出色保护。因此，3D 打印 CA 材料的应用在轻质、可持续和防腐工程材料领域显示出巨大的实施前景。