苎麻增强回收聚丙烯复合材料的制备及其性能的研究
Preparation and Properties of Recycled Polypropylene Composites Reinforced by Ramie Fiber

本文分别使用碱法改性和柠檬酸改性两种方法对苎麻纤维进行改性，制备了苎麻/回收聚丙烯复合材料，对材料的冲击性能、硬度、拉伸性能、耐热性能等进行了研究。结果表明，两种方法均能有效清除苎麻表面杂质，用苎麻纤维增强回收聚丙烯复合材料，可以提高废旧聚丙烯的力学性能。在苎麻纤维长度为1.5 cm，苎麻含量为6%柠檬酸改性方法下，冲击强度提升至8.222 kJ/m²，拉伸强度提升至38.2 MPa，断裂伸长率降低136%，硬度提升13.3%。在苎麻纤维长度为1.5 cm，苎麻含量为6%碱法改性方法下，冲击强度提升至6.854 kJ/m²，拉伸强度提升至为29.5 MPa，断裂伸长率降低139%，硬度提升5%。
In this paper, Ramie fibers were modified using two methods, namely alkali modification and citric acid modification. Ramie/recycled polypropylene composites were prepared, and the impact properties, hardness, tensile properties, and heat resistance of the materials were investigated. The results showed that both methods were effective in removing the surface impurities of ramie, and the mechanical properties of used polypropylene could be improved by reinforcing the recycled polypropylene composites with ramie fibers. Under the method of ramie fiber length of 1.5 cm and ramie content of 6% citric acid modification, the impact strength was increased to 8.222 KJ/m², the tensile strength was increased to 38.2 MPa, the elongation at break was reduced by 136%, and the hardness was increased by 13.3%. Under the ramie fiber length of 1.5 cm, ramie content of 6% alkali modification method, the impact strength was increased to 6.854 KJ/m², the tensile strength was increased to 29.5 MPa, the elongation at break was reduced by 139%, and the hardness was increased by 5%.