香蕉纤维的表面改性及其增强环氧树脂复合材料的性能研究

采用硅烷偶联剂(A-174)偶联、高锰酸钾接枝和乙酰化包覆等3种方法对香蕉纤维进行表面改性,制备了改性香蕉纤维增强环氧树脂复合材料,测试其拉伸、弯曲、压缩、冲击等力学性能。结果表明,偶联、接枝、包覆等表面改性均能明显改善香蕉纤维与基体树脂的相容性,提高复合材料的力学性能,其中偶联改性的效果最好。当改性香蕉纤维含量为10wt%时,与未改性的香蕉纤维比较,复合材料的拉伸强度、弯曲强度、压缩强度分别提高了1.8、1.0、2.6倍;随着纤维含量的增加,复合材料的力学性能明显提高。

Modification of Banana Fiber and Properties of Epoxy Composites

The surface of banana fibers were modified by three methods of silicane coupling agent A-174 coupling,potassium permanganate grafting and acetylation encapsulating.The modified banana fiber reinforced epoxy composites were prepared.The tensile strength,flexural strength,compressive strength and impact strength were tested.The result indicated that the compatibility of banana fiber and epoxy resin matrix could be improved by surface modification and the mechanical properties of the composites were improved significantly,which coupling was the best.When the composites content of modified banana fiber was 10wt%,its tensile strength,flexural strength and compressive strength was increased by 1.8,1.0,2.6 times compared to the composites without modified.With the content of banana fiber was increased,the mechanical properties of the composites were improved.