Printing Parameters of Fused Filament Fabrication Affect Key Properties of Four-Dimensional Printed Shape-Memory Polymers
Printing Parameters of Fused Filament Fabrication Affect Key Properties of Four-Dimensional Printed Shape-Memory Polymers
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DOI：
10.1089/3dp.2021.0072
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发表时间：
2021-10-08
影响因子：
3.1
通讯作者：
Henderson, James H.
中科院分区：
文献类型：
--
作者：
Pieri, Katy;Felix, Bailey M.;Henderson, James H.
基于挤出（熔丝制造）的形状记忆聚合物（SMP）三维（3D）打印具有快速生产高度定制的智能材料部件的潜力。然而，印刷参数对印刷SMP的形状记忆特性的影响仍然知之甚少。为了研究3D打印工艺对打印SMP部件的形状记忆特性的影响程度，系统地改变了温度、挤出速率乘数和纤维取向，并评估了它们对形状记忆固定和恢复率的影响。纤维取向，如通过在形状记忆编程期间相对于加载方向的打印路径所确定的，被发现显著影响固定率和恢复率。温度和倍率对固色率和回收率的影响不大。为了促进打印SMP部件在生物医学应用中的使用，对使用不同温度和倍增器制备的3D打印样品进行细胞活力测定。发现倍增器的降低增加细胞活力。结果表明，纤维取向可以严重影响3D打印SMP部件的形状记忆功能，并且乘数可以影响这些部件的细胞相容性。因此，在3D打印部件和设备中使用SMP的研究人员和制造商可以实现改进的部件功能，如果打印路径被设计为将纤维方向与应变将被编程和恢复的轴对齐，并且如果倍增器在生物医学应用中被优化，其中部件将接触细胞。
Extrusion-based (fused filament fabrication) three-dimensional (3D) printing of shape-memory polymers (SMPs) has the potential to rapidly produce highly customized smart-material parts. Yet, the effects of printing parameters on the shape-memory properties of printed SMPs remain poorly understood. To study the extent to which the 3D printing process affects the shape-memory properties of a printed SMP part, here temperature, extrusion rate multiplier, and fiber orientation were systematically varied, and their effect on shape-memory fixing and recovery ratios was evaluated. Fiber orientation, as determined by print path relative to the direction(s) of loading during shape-memory programming, was found to significantly impact the fixing ratio and the recovery ratio. Temperature and multiplier had little effect on either fixing ratio or recovery ratio. To facilitate the use of printed SMP parts in biomedical applications, a cell viability assay was performed on 3D-printed samples prepared using varied temperature and multiplier. Reduction in multiplier was found to increase cell viability. The results indicate that fiber orientation can critically impact the shape-memory functionality of 3D-printed SMP parts, and that multiplier can affect cytocompatibility of those parts. Thus, researchers and manufacturers employing SMPs in 3D-printed parts and devices could achieve improved part functionality if print paths are designed to align fiber direction with the axis(es) in which strain will be programmed and recovered and if the multiplier is optimized in biomedical applications in which a part will contact cells.