聚乳酸(PLA)的流变性能研究

以聚乳酸切片为原料,在不同温度下,利用毛细管流变仪测试其流变性能。流动曲线表明,聚乳酸熔体属于典型的切力变稀型非牛顿流体,其黏流活化能较低,有利于纺丝工艺条件的控制,且熔体结构黏度指数随熔体温度增高而减小,纺丝成纤性得到改善。

Study of PLA rheological properties

The rheological properties of PLA chip were measured by extrusion capillary rheometer at different temperatures and shear rates.The flow curve showed that the PLA melt was typical shear-thinning and non-Newtonian fluid.The viscous flow activation energy was a few lower in the temperature range.It must be good for controlling of the spinning condition.As the temperature increased,the structural viscosity index decreased,the fiber-forming behavior was improved as well.