ABSTRACT

Epoxy-sized carbon fibre (ESCF) was modified by post-oxidation in air atmosphere at polyamide 66 matrix process temperature for enhancing the interfacial property of the composite. The influence of the post-oxidation on the fibre mechanical and bundling properties is negligible for protection of the reserved sizing. The optimal interlaminar shear strength value of the composite reinforced with the post-oxidation-modified ESCF for 15 min was remarkably enhanced to 80.4 MPa by 426%, compared to that reinforced with the pristine ESCF, and by 93% compared to that reinforced with nitrogen heat-treated ESCF. The interfacial property improvement is attributed to thermal stability improvement and newly generated functional groups of the carbon fibre surface, which not only improved the interaction between the fibre and sizing, but also enhanced the interfacial adhesion between the fibre and surrounding matrix.

摘要

环氧上浆碳纤维 (ESCF) 通过在聚酰胺 66 基体工艺温度下在空气气氛中进行后氧化改性，以提高复合材料的界面性能。后氧化对纤维机械和集束性能的影响对于保护保留的上浆可以忽略不计。氧化后改性ESCF增强复合材料15 min的最佳层间剪切强度值显着提高至80.4 MPa，与原始ESCF增强相比提高了426%，与氮气增强相比提高了93%热处理ESCF。界面性能的改善归因于热稳定性的改善和碳纤维表面新生成的官能团，这不仅改善了纤维与上浆之间的相互作用，