改性聚对苯撑苯并双噁唑纤维增强聚酰亚胺复合材料的摩擦磨损性能

分别采用稀土溶液（RES）和偶联剂对聚对苯撑苯并双噁唑（PBO）纤维进行表面改性处理，并评价了改性前后PBO与热塑性聚酰亚胺（TPI）复合材料的冲击性能和摩擦磨损性能.结果表明，RES和偶联剂都能够提高PBO纤维与TPI基体之间的界面结合性能，从而提高PBO/TPI复合材料的冲击性能和摩擦磨损性能，而且RES改性处理的方法更有效，在相同的试验条件下，经过RES处理的PBO/TPI复合材料的冲击性能和摩擦磨损性能最优.这是由于经RES改性处理后PBO纤维表面O/C的比率较大，表明RES改性处理PBO纤维表面的含氧活性官能团浓度较高，从而有效提高了纤维与树脂基体之间的结合性能.

Tribological Properties of Modified Poly-p-phenylene Benzobisthiasole Fiber Reinforced Thermoplastic Polyimide Composite

Rare earth solution (RES) and coupling agent surface modification were employed towards poly-p-phenylene benzobisthiasole (PBO) fibers, and impact and tribological properties of the untreated and treated PBO/TPI composites were evaluated. The results show that both RES and coupling agent surface modification can improve the interfacial adhesion between PBO fibers and TPI matrix, and accordingly enhance the impact and tribological properties. Compared with the untreated and coupling agent treated PBO/TPI composites, the RES treated composite has better interfacial adhesion. The RES surface modification is the most effective one to improve the impact and tribological properties under the same test conditions. This is because that the ratio of oxygen/carbon on the surface of RES treated PBO fiber is the maximal one, which indicates the content of polar groups on the surface of PBO fibers increases compared with the others. The increase in the amount of polar groups could strengthen the interfacial adhesion between PBO fibers and TPI matrix effectively.