臭氧改性碳纤维/聚酰亚胺复合材料的制备与性能研究

STUDY ON THE PREPARATION AND INTERFACE PERFORMANCE OF O_3-OXIZED CARBON FIBER/POLYIMIDE COMPOSITES

采用臭氧氧化的方法对碳纤维进行表面改性,并用作热塑性聚酰亚胺树脂的增强体。采用单丝拉伸试验、XPS研究臭氧处理时间对碳纤维单丝拉伸强度和表面官能团的影响。结果表明,臭氧处理时间越长,碳纤维力学性能的下降程度越大,而表面含氧官能团含量越多。优选单丝拉伸强度保留率较高、含氧官能团含量较丰富的碳纤维与热塑性聚酰亚胺制成复合材料,并评价其层间剪切强度(ILSS)。结果表明,臭氧处理5 min就可使碳纤维/聚酰亚胺复合材料的ILSS提升43%,说明臭氧处理可显著提升碳纤维/热塑性聚酰亚胺的界面性能。

Carbon fiber,the surface of which was modified through ozone oxidation,was used as the reinforcement for thermoplastic polyimide resin. Effect of ozone treatment time on monofilament tensile strength and surface functional groups had been studied using monofilament tensile test and X-ray photoelectron spectroscopy( XPS),respectively. The results indicated that the mechanical properties of carbon fiber was destructed,and the oxygencontaining functional groups on the surface increased with the process of the ozone treatment. The composites were made by thermoplastic polyimide and carbon fiber oxidized with the high retention rate of monofilament tensile strength and high oxygen-containing functional groups,and the interlaminar shear strength was evaluated. The results show that compared with unoxidized specimen,the interlaminar shear strength of the composites made by thermoplastic polyimide and carbon fiber oxidized for 5 minutes increased by 43%,showing that ozone treatment can effectively enhance fiber-matrix interfacial bonding.