Mechanical properties of dense polylactic acid structures fabricated by three dimensional printing
Mechanical properties of dense polylactic acid structures fabricated by three dimensional printing
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DOI：
10.1163/156856297x00588
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发表时间：
1996-01-01
影响因子：
3.6
通讯作者：
Cima, MJ
中科院分区：
文献类型：
--
作者：
Giordano, RA;Wu, BM;Cima, MJ
聚乳酸（PLA）是一种生物可吸收聚合物，用于许多临床情况。PLA的复杂形状通常被加工用于骨固定和重建。固体自由形式制造方法，例如3D打印，可以直接从CAD模型生产复杂形状的制品。本研究报告了3D打印PLLA部件的机械性能。3D打印是一种固体自由成型制造工艺，其通过将粘合剂喷墨打印成连续的粉末层来生产组件。测试棒由低分子量和高分子量PLA粉末与用作粘合剂的氯仿制成。改变粉末的每单位线长度印刷的粘合剂以分析印刷条件对PLA条的机械和物理性质的影响。此外，在印刷后进行冷等静压，以改善印刷条的机械性能。低分子量PLLA（53 000）的最大测量拉伸强度为17.40 +/- 0.71 MPa，高分子量PLLA（312 000）为15.94 +/- 1.50 MPa。
Polylactic acid (PLA) is a bioresorbable polymer that is used in a number of clinical situations. Complex shapes of PLA are commonly machined for bone fixation and reconstruction. Solid free form fabrication methods, such as 3D printing, can produce complex-shaped articles directly from a CAD model. This study reports on the mechanical properties of 3D-printed PLLA parts. 3D printing is a solid free-form fabrication process which produces components by ink-jet printing a binder into sequential powder layers. Test bars were fabricated from low and high molecular weight PLA powders with chloroform used as a binder. The binder printed per unit line length of the powder was varied to analyze the effects of printing conditions on mechanical and physical properties of the PLA bars. Furthermore, cold isostatic pressing was performed after printing to improve the mechanical properties of the printed bars. The maximum measured tensile strength for the low molecular weight PLLA (53 000) is 17.40 +/- 0.71 MPa and for high molecular weight PLLA (312 000) is 15.94 +/- 1.50 MPa.