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以亚麻落麻纤维、聚乳酸纤维为原料,采用非织造结合模压成型工艺制备了完全可降解复合材料。研究了增强纤维体积分数及纤维长度对复合材料弯曲、冲击性能的影响,采用扫描电镜(SEM)研究了复合材料中纤维与树脂之间的界面结合状况。结果表明:材料的弯曲、冲击强度均随纤维长度的增加而增大,当纤维长度为72mm时,体积分数为40%的材料具有最好的弯曲性能,纵横向弯曲强度分别为55.15、42.02MPa;体积分数为50%的材料具有最好的冲击性能,纵横向冲击强度分别为19.714、14.012kJ/m2;裁切断口处的SEM表明增强纤维与基体树脂之间存有一定数量的空隙,两相之间的界面结合强度有待进一步改善。
Using flaxseed fiber and polylactic acid fiber as raw materials, a completely degradable composite material was prepared by non-woven combined with molding process. The effects of fiber volume fraction and fiber length on the flexural and impact properties of the composites were investigated. The interfacial bonding between the fibers and the resin was investigated by scanning electron microscopy (SEM). The results show that the flexural and impact strength of the material increases with the increase of the fiber length. When the fiber length is 72mm, the material with the volume fraction of 40% has the best bending property, the longitudinal and transverse flexural strengths are 55.15 and 42.02 MPa ; The material with the volume fraction of 50% has the best impact performance and the longitudinal and transverse impact strength is 19.714 and 14.012 kJ / m2, respectively; the SEM at the cutting fracture shows that there is a certain amount of voids between the reinforcing fiber and the matrix resin, The interfacial bonding strength needs to be further improved.