改性黄麻纤维和酚醛树脂复合材料的力学性能

采用碱溶液(20 g/L NaOH)、热(140℃)处理方法对黄麻纤维进行改性处理,采用热压工艺将纤维与酚醛树脂制成复合材料。通过力学性能、冲击断口形貌对复合材料进行表征。结果表明:当碱处理时间不超过2 h、热处理时间不超过3 h时,黄麻纤维增强酚醛树脂基复合材料的拉伸强度和冲击强度均有不同程度提高。碱处理2 h的黄麻纤维增强酚醛树脂基复合材料的拉伸强度和冲击强度提高幅度最大,分别为13.5%和25%;冲击断口分析结果表明,热处理纤维与基体的界面结合强度高于碱处理纤维,断口呈平面化。

Study on Modification of Jute Fibers and Mechanical Properties of Phenolic Resin Matrix Composites Reinforced with Jute Fibers

Jute fibers were modified with alkali solution (20 g/L NaOH) and heat (140℃) treatment for different duration, respectively. Phenolic resin matrix composites reinforced with jute fiber were prepared by hot press method. The mechanical properties and impact fracture of the composites were investigated. The results show that the tensile strength and the impact strength of the composites are increased when the duration of alkali treatment and heat treatment is not more than 2 h and 3 h, respectively. Particularly, the tensile strength and the impact strength are increased by 13.5% and 25% when the fibers are treated for 2 h by alkali. The impact fracture analysis show that the adhesion strength between heat-treated fibers and matrix is higher than that between alkali-treated fibers and matrix, and the fracture of the former composite is even.