麻纤维增强完全可降解复合材料的制备及性能研究

Processing and Properties of Flax Fibers Reinforced Biodegradable Composite

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。

Flax noil fibers reinforced polylactide composites were prepared by means of flax noil fibers and polylactide fibers, non-woven method and moulding pressing technology. The effects of fibers volume fraction and fibers length On bending and impact strengths of the composites were discussed respectively, and the interface adhesion were studied by scanning electron microscopy. The results revealed that the bending and impact strengths both increased with the fibers length up to 72mm, the longitudinal and transverse bending strengths attained a peak at fibers volume fraction of 40% ,which were 55.15,42.02MPa respectively,while the longitudinal and transverse impact strengths reached the highest point at fibers volume fraction of 50% , which were 19.714, 14.012kJ/m^2 respectively. The SEM revealed that there was a certain number of interspaces between the flax fibers and the matrix,which should be reduced so as to improve the interface adhesion.