3D打印条件对可降解聚乳酸力学性能的影响

Effects of 3D Printing Conditions on Mechanical Properties of Biodegradable Poly(lactic acid)

采用3D打印方式制备降解左旋聚乳酸(PLLA)样品,通过冲击及拉伸试验研究不同打印条件对样品冲击强度、拉伸强度、拉伸模量及断裂伸长率的影响。结果表明,随着打印填充密度的增加,样品的冲击强度、拉伸强度及拉伸模量增大,断裂伸长率先增后减;随着打印速度的增加,样品的拉伸强度和拉伸模量增大,冲击强度及断裂伸长率减小;随着打印温度的增加,样品的冲击强度、拉伸强度和拉伸模量增大,断裂伸长率减小;打印填充密度、打印速度、打印温度分别为70%、100 mm/s、210℃时,样品的综合性能最佳。

Biodegradable poly(lactic acid) samples were prepared by 3D printing.The effect of printing conditions on the impact strength,tensile strength and modulus,and elongation at break of the samples was studied.It was found that with increasing filling density,the impact strength,tensile strength and modulus increased but the elongation at break decreased after an initial increase.With increasing print speed,tensile properties increased,the impact strength and elongation at break decreased.With increasing print temperature,impact strength and tensile properties increased,the elongation at break decreased.The sample provided the best comprehensive performance when the filling density was 70%,the print speed was 100 mm/s,the print temperature was 210 ℃.