Abstract

This study focuses on mechanical characterization of carbon fiber reinforced polymer (CFRP) laminates reinforced with non-treated and treated multiwalled carbon nanotubes (CNTs) using nitric acid. The CNTs were treated using nitric acid to obtain carboxylic functional group. The epoxy resins are mixed with 0.3%wt of multiwalled CNTs at a constant mixing speed of 2000 rpm and mixing times varied from 24 to 96 h. Laminates reinforced with treated multiwalled CNTs show an increase in the flexural strength by 17.4 and 15.3% at mixing times of 24 and 96 h as compared to control laminates. The test results indicated that laminates reinforced with treated multiwalled CNTs have improved interlaminar shear failure stress which is 14 and 7% higher at mixing times of 24 and 96 h as compared to control specimen. Improvement in behavior was achieved for functionalized CNTs based laminates which prevents agglomeration. Longer mixing time (96 h) is not beneficial for enhancing the mechanical properties due to the break-up of small aggregates by overcoming the effect of van der Waals forces.

摘要

本研究的重点是使用硝酸对用未经处理和经处理的多壁碳纳米管 (CNT) 增强的碳纤维增强聚合物 (CFRP) 层压板进行机械表征。用硝酸处理碳纳米管以获得羧基官能团。环氧树脂与 0.3%wt 的多壁碳纳米管以 2000 rpm 的恒定混合速度混合，混合时间从 24 小时到 96 小时不等。与对照层压板相比，用处理过的多壁 CNT 增强的层压板在 24 和 96 小时的混合时间显示弯曲强度增加了 17.4% 和 15.3%。测试结果表明，用处理过的多壁碳纳米管增强的层压板具有改进的层间剪切破坏应力，与对照样品相比，在混合时间为 24 和 96 小时时，该应力提高了 14% 和 7%。基于功能化碳纳米管的层压板实现了行为的改进，可防止团聚。较长的混合时间（96 小时）不利于提高机械性能，因为通过克服范德华力的影响小聚集体的破碎。