剑麻纤维接枝改性对其增强PLA复合材料性能影响

Effect of Grafting Modified Sisal Fiber on Properties of PLA Composites

通过紫外光在剑麻纤维表面接枝甲基丙烯酸甲酯(MMA),利用改性后的剑麻纤维与聚乳酸(PLA)熔融共混制备纤维增强复合材料。结果表明:改性后的剑麻在1 729.9cm-1处出现明显的羰基吸收峰。当MMA质量分数为60%,光照时间为4min时,其改性剑麻纤维制备的复合材料拉伸强度、弯曲强度和冲击强度达到最优,与未改性剑麻纤维复合材料相比分别提高了37.53%,34.82%,79.45%。改性后的剑麻纤维在PLA基体中分散较好,嵌入到PLA基体中,相界面模糊。

Methyl methacrylate （MMA） was grafted gradually onto the sisal fiber surface by ultraviolet radiation grafting modification, and the modified fiber reinforced composites were prepared by melt blending with polylactic acid（PLA）. The results show that the carbonyl absorption peak of modified sisal appeares at 1729.9 cm 1. When the mass fraction of MMA is 60 ~ and the illumination time is 4 rain, the tensile strength, bending strength and impact strength can achieve the optimal, and are respectively increased by 37.53%, 34. 82 %, 79.45%, compared with the unmodified sisal fiber composites. The modified sisal fibers are dispersed in the PLA matrix, and embedded in the PLA matrix, and the interface is blurred.