亚麻/PP复合材料的制备及其弯曲性能研究

Flexural Properties of Flax Fiber Reinforced PP Composite

将亚麻纤维作为增强体,与聚丙烯(PP)纤维进行混合,同时与PP长丝形成PP包覆亚麻的纱线结构,利用机织工艺织造成机织布作为复合板材的预制件,采用层合热压方法制备亚麻/PP复合材料。通过对板材弯曲性能进行测试,研究了制备工艺、纱线结构以及亚麻纤维含量(质量分数)等因素对复合材料弯曲性能的影响。研究结果表明,"三明治"铺层方法制备的板材较"混纤法"制备的板材体现出更优异的弯曲性能;与加捻纱相比,包覆纱结构板材表现出更优良的弯曲性能;以亚麻/PP包覆纱为增强体的复合材料,当亚麻纤维质量分数为46%时,其弯曲性能最优良。

Flax fiber was used as reinforcing material to commingle with polypropylene （PP） fiber to realize the mixture of two materials at the stage of yarn. Meanwhile, PP filaments were introduced to produce a core - spun yarn with flax/ PP as core and PP filament as outer sheath. The commingled yams were woven into 2 - D fabric which was used as the prefabricated material. The composite laminates were prepared by hot press technology. The effects of manufacture technology, yarn structure and fiber weight fraction on flexural properties of composites were investigated through analyzing the flexural testing results. The results show that the properties of composites made by sandwich stacking method are better than the properties of composites made by fiber blending method, and wrap yams demonstrate a significant improvement over twisted yams when they are used in the manufacture of composites. When flax/Pp wrap yarns are involved in the process of composite lamination. 46% of flax fiber fraction is considered the best ratio as far as flexural properties are concerned.