Effect of multi-walled carbon nanotubes on mechanical properties of Ti-carbon fiber/polyimide by monomer polymerization super hybrid composite laminates
-
摘要: 为了改善Ti/反应型聚酰亚胺(PMR)树脂界面的黏结强度,从而提高Ti-碳纤维(CF)/PMR超混杂层板的力学性能,本文探究了添加多壁碳纳米管(MWCNTs)对Ti-CF/PMR超混杂层板力学性能的影响。将不同质量分数(0wt%、2.5wt%、5.0wt%和7.5wt%)的MWCNTs利用超声分散法均匀分散于PMR树脂中,随后进行Ⅰ型断裂韧性试验,探究添加MWCNTs对Ti-CF/PMR超混杂层板界面性能的影响,最后选取最优含量的MWCNTs同时添加到PMR胶层和CF/PMR树脂中,并进行弯曲试验,探究添加MWCNTs对Ti-CF/PMR超混杂层板力学性能的影响。通过SEM观察和分析了相应的失效模式和增强机制。结果表明:当MWCNTs含量为5.0wt%时,Ⅰ型层间断裂韧性提高了74%;同时添加5.0wt% MWCNTs于PMR胶层和CF/PMR复合材料树脂中,Ti-CF/PMR超混杂层板的弯曲性能较未添加MWCNTs提高了42%。这是由于MWCNTs在PMR胶层和CF/PMR树脂中的分布均匀性较高,且能分散并承受界面层转移到纤维层的载荷,并利用自身拔出、断裂、桥接、脱黏来吸收并消耗断裂能量,进一步提升Ti-CF/PMR超混杂层板的弯曲性能。Abstract: In order to improve the bonding strength of Ti/polyimide by monomer polymerization (PMR) resin interface and improve the mechanical properties of Ti-carbon fiber(CF)/PMR super hybrid laminates, the effect of the addition of multi-walled carbon nanotubes (MWCNTs) on the mechanical properties of Ti-CF/PMR super hybrid laminates was investigated in this paper. The MWCNTs with different mass fractions (0wt%, 2.5wt%, 5.0wt% and 7.5wt%) were uniformly dispersed in PMR resin by ultrasonic dispersion. The mode Ⅰ interlaminar fracture toughness tests were experimentally conducted to explore the effect of adding MWCNTs on the interface properties of Ti-CF/PMR super hybrid laminates. Then the MWCNTs of optimized content was added to the PMR adhesive layer and CF/PMR resin to conduct bending test so as to explore the effect of adding MWCNTs on the mechanical properties of Ti-CF/PMR super hybrid laminates. SEM was used to investigate the interface morphology and enhancement mechanism of Ti-CF/PMR super hybrid laminates. The results reveal that the mode Ⅰ interlaminar fracture toughness of the PMR adhesive layer for Ti-CF/PMR super hybrid laminates is improved by 74% with 5.0wt% MWCNTs; when 5.0wt% MWCNTs are added into both the PMR adhesive layer and CF/PMR resin, the bending property of Ti-CF/PMR super hybrid laminates is improved by 42% compared with those without adding MWCNTs. This is because the MWCNTs are uniformly dispersed in the PMR adhesive layer and CF/PMR resin, and it can disperse and bear the load transferred from the interface layer to the fiber layer, using its own pull-out, fracture, bridging, debonding to absorb and consume the fracture energy to further improve the bending performance of the Ti-CF/PMR super hybrid laminates.
-
-
期刊类型引用(1)
1. 曾鹏程,肖书平,杨柳,谈灵操,徐百平. 较宽压强响应范围和较高灵敏度的聚丙烯基电容式压力传感器的研制. 机电工程技术. 2025(03): 58-63 . 百度学术
其他类型引用(3)
-
计量
- 文章访问数: 790
- HTML全文浏览量: 84
- PDF下载量: 118
- 被引次数: 4