振动力场下PP/CF复合材料的结构与力学性能

The Micro Structure and Mechanical Properties of PP/CF Composite under Periodical Vibration Force Field

采用最新开发的平衡式三螺杆动态混炼挤出机在稳态与振动条件下制备了PP/CF复合材料。探究了振动力场对不同配比的PP/CF复合材料的微观结构和力学性能的影响,以及不同振动参数对PP/CF复合材料的微观结构和力学性能的影响。结果表明,振动力场的加入不仅促进了CF在PP基体中的均匀分散,而且增强了PP与CF的界面结合,从而提高了复合材料的力学性能。与此同时,强度过大的振动力场会导致复合材料中CF的平均长度下降,使其力学性能下降。当振幅A=0. 4 mm,振频f=10 Hz时,PP/CF复合材料的力学性能达到最优,此时获得的PP/CF复合材料的拉伸强度和冲击强度比在稳态挤出条件下分别提升了约28%和18%。

Applying newly developed balanced three-screw dynamic extruder, polypropylene/carbon fiber （PP/CF） composite was prepared by steady extrusion and vibration extrusion. The effects of vibration force field on the micro structure, mechanical properties of PP/CF composite with different proportions and the effects of vibration force field with different parameters on the micro structure, mechanical properties of PP/CF composite were investigated. The results showed that, compared with steady extrusion, vibration extrusion not only prompted the desperation of CF in the composite but also reinforced the interfacial compatibility. Meanwhile, excessive vibration force field could lead to the decrease of the average length of CFs in the composite, thus the mechanical properties of the composite declined. When the vibration amplitude was set at 0.4 mm and the vibration frequency was set at 10 Hz, the PP/CF composite had the best comprehensive mechanical properties, the tensile strength and the impact strength of the PP/CF composite increased by about 28% and 18% compared with the composite prepared by steady extrusion.