热塑性颗粒-无机粒子协同增韧碳纤维增强环氧树脂复合材料

Synergistic toughening of thermoplastic particles-inorganic particles to carbon fiber reinforced epoxy resin composites

针对碳纤维增强环氧树脂(CF/EP)复合材料层间断裂韧性进行研究,通过在CF/EP复合材料层间添加四种无机纳米粒子和三种热塑性颗粒对其进行II型层间断裂韧性(GIIC)研究,选择工艺性和增韧性效果好的两种无机纳米粒子和热塑性颗粒进行协同增韧研究。结果表明,CF/EP复合材料的GIIC在适当的无机纳米粒子含量下都得到提高,这主要是由于无机纳米粒子在层间形成了有效吸收断裂能的微结构,纳米羟基氧化铝(AlOOH)的工艺性及增韧性等综合性能最好,AlOOH质量分数为1wt%时,CF/EP复合材料的GIIC达到931 J/m2,提高了29.3%;热塑性颗粒中,改性聚芳醚酮颗粒(PAEK)的综合性能最好,添加10wt%PAEK,CF/EP复合材料的GIIC可以提高32%,这是由于预制在层间的热塑性颗粒随着基体流动而得到扩散,形成了独特的跨层间连续结构,从而使裂纹扩展的阻力增加,有效提高了CF/EP复合材料的GIIC;10wt%PAEK和1wt%AlOOH共同增韧CF/EP复合材料的GIIC达到1 368 J/m2,相对于未增韧的CF/EP复合材料提高了90%,增韧效果比PAEK和AlOOH对CF/EP复合材料的增韧效果之和大,这表明,PAEK和AlOOH同时加入CF/EP复合材料层间,对CF/EP复合材料具有协同增韧效应。

The interlaminar fracture toughness of carbon fiber reinforced epoxy resin(CF/EP) composites was studied. The type II interlaminar fracture toughness(GIIC) was studied by adding four kinds of inorganic nano-particles and three kinds of thermoplastic particles into the interlaminar of CF/EP composites. One kind of inorganic nanoparticle and one kind of thermoplastic particles with good operability and tougheness effect were selected to study the synergistic toughening property. The results show that the GIIC of CF/EP composites is improved with appropriate inorganic nano-particle, which is mainly due to the micro-structure formation between layers and fracture energy absorbed effectively. The comprehensive properties of nano sheet boehmite(AlOOH) are the best. When the content of AlOOH nano particles is 1 wt%, the GIIC of CF/EP composites reaches 931 J/m2, which increases by 29.3%.Among the thermoplastic particles, the modified poly(aryl ether ketone)(PAEK) has the best comprehensive properties. Adding 10 wt%PAEK in the layers, the GIIC of the CF/EP composite can be increased by 32%. This is due to the diffusion of thermoplastic particles between layers along with the flow of EP matrix, forming a unique interlaminar continuous structure, which increases the resistance of crack propagation and effectively improves GIIC of the CF/EP composites. The GIIC of the CF/EP composites toughened by both 10 wt%PAEK and 1 wt%AlOOH reaches1 368 J/m2, compared with the non-toughened CF/EP composites, which is increased by 90%. The toughening effect is greater than the sum of adding PAEK and AlOOH. This shows that the addition of both PAEK and AlOOH into the interlayer of CF/EP composites has a synergistic toughening effect.