Development and Application of Viscoelastic Flow Simulation Technique for Polymer/Vapor-Grown Carbon Fiber Nano-composite Melts

考虑了聚合物挤压过程中出现的毛细挤压问题。聚合物/VGCF（气相生长碳纤维）复合材料熔体的挤出实验结果表明，随着VGCF含量的增加，挤出直径减小。聚合物/VGCF复合材料的熔体流变学测试结果表明，这种现象有利于聚合物/VGCF复合材料的拉伸流动性能。然后，利用可以单独设定拉伸流动特性的Phan-Thien Tanner模型对挤压流动问题进行了计算。结果表明，计算结果与实验数据在定量上基本一致。研究结果表明，利用已有的粘弹性流体模型可以对聚合物/VGCF纳米复合熔体进行有效的流动模拟。

We considered the capillary extrusion problems that can be seen in polymer extrusion process. According to the extrusion experimental results of polymer/VGCF(Vapor-grown carbon fiber) composite melt, the diameter of the extrusion decreased with an increase of VGCF contents. According to melt rheology measurement results of polymer/VGCF composite, this phenomenon would contribute the elongational flow property. Then, we calculated the extrusion flow problem by using the Phan-Thien Tanner model that can set the property of elongational flow individually. As the results, the calculation results agreed with the experimental data quantitatively. The whole obtained results in this study imply that the useful flow simulation for polymer/VGCF nanocomposite melts can be carried out by using the viscoelastic fluid model in existence.