取向长剑麻纤维增强聚乳酸层压复合材料力学性能的研究

Research on the Mechanical Properties of Aligned Long Sisal Fiber Reinforced Laminated Polylactide Biocomposites

通过溶液浸渍法制备剑麻纤维预浸渍料,然后通过热压成型的方法制备了纤维含量(质量分数)分别为10%、20%、30%和40%的取向长剑麻纤维增强聚乳酸层压复合材料,同时制备了随机取向的短剑麻纤维增强聚乳酸复合材料。研究了不同的纤维含量对取向长剑麻纤维增强聚乳酸层压复合材料力学性能的影响。结果表明,当纤维含量为40%时,复合材料的力学性能最好。其拉伸强度、弯曲强度以及冲击强度比纯聚乳酸分别提高了1.90、1.29以及15.69倍,比短纤维剑麻纤维增强聚乳酸分别提高了4.47、2.27以及10.73倍,达到了164.76、202.88 MPa以及36.72 k J/m^2。

Sisal fiber prepregs were made by solution dipping method, then aligned long sisal fiber reinforced laminated polylactide composites with different sisal fiber weight contents （including 10wt%, 20wt% , 30wt% and 40wt% ） were prepared using compression molding technique. The effects of fiber contents on the mechanical properties of aligned long sisal fiber reinforced laminated polylactide composites were studied. The results show that, when fiber content is 40wt%, the composites has the best mechanical properties. The tensile, flexural and impact strength of the composites reach 164. 76 MPa, 202.88 MPa and 36. 72 kJ/m2, respectively, which are higher 1.90, 1.29 and 15.69 times respectively than that of pure PLA and increased by 4.47, 2.27 and 10. 73 times respectively, compared with short sisal fiber reinforced polylactide composites.