苎麻增强PP复合材料的缠结结构与性能

The Entanglement Structure and Performances of Ramie Fiber Reinforced Polypropylene

通过对比苎麻增强PP、玻纤增强PP以及纯PP样品,探讨了苎麻增强PP的结构与性能,发现苎麻纤维增强PP较低的熔体流动速率主要由苎麻纤维的缠结结构造成。结果表明:缠结可以有效增强材料网络的连通性,提升材料对于形变的抵抗能力,从而能够抵抗1. 9 m落球冲击能而不破坏。同时苎麻柔软缠结的特点明显地提高了材料的回收加工性能保持率,3次回收后仍能保持在85%以上,并且,加入刚性填料后,其力学性能基本不受影响。材料在注塑成型后,苎麻纤维的缠结结构造成沿流动方向与垂直于流动方向的力学性能差异减小,从而提高了材料在复杂受力条件下的使用稳定性。

The structural and performance characteristics of ramie fiber reinforced PP, glass fiber reinforced PP and pure PP were compared to find that strong entanglement of ramie fiber was the main reason in decreasing the melt flow rate of ramie fiber reinforced PP. The entanglement enhanced the connectivity of the material network to increase the resistance to deformation by prompting the material intact from 1.9 m falling ball test. The entanglement also increased the recyclability of the material that the 85% mechanical properties were kept after 3 times recycle. The entanglement protected the properties of the material from affecting after rigid particles mixed. The strong entanglement of ramie fiber also reduced the mechanical properties variation between flow direction and perpendicular direction to enhance the working stability of the material under complex force condition.