Yang Cheng, Xu Jing, Xing Yue, Hao Sijia, Ren Zhidong
Research Center of Graphene Applications, Beijing Institute of Aeronautical Materials Haidian District Beijing 100095 China
RSC Adv. 2020 Jul 7;10(43):25685-25695. doi: 10.1039/d0ra04418k. eCollection 2020 Jul 3.
This paper presents a novel method using poly(aryl ether ketone) containing pendant carboxyl groups to covalently functionalize graphene oxide. The functionalized graphene oxide (LFG) was used to prepare poly(ether ether ketone) (PEEK) composites through melt blending. It is found that LFG has great interface adhesion to the PEEK matrix, and just a small amount of it can simultaneously improve the strength and toughness of the composites, while unmodified graphene oxide could enhance strength but cause toughness damage. The tensile and impact strength of composite with 0.1 wt% LFG are 5.7% and 20.5% higher than that of neat PEEK, respectively. In addition, 0.5 wt% LFG composite shows great friction and wear performance with friction coefficient and specific wear rate 27.3% and 18.3% lower than that of PEEK. Furthermore, the composites can be used as practical high-performance additive manufacturing materials because LFG is able to improve the mechanical performance of the fused deposition modeling (FDM) composite samples significantly.
本文提出了一种使用含羧基侧基的聚芳醚酮对氧化石墨烯进行共价功能化的新方法。通过熔融共混，使用功能化氧化石墨烯（LFG）制备聚醚醚酮（PEEK）复合材料。研究发现，LFG与PEEK基体具有良好的界面黏附性，只需少量就能同时提高复合材料的强度和韧性，而未改性的氧化石墨烯虽能提高强度，但会导致韧性受损。含0.1 wt% LFG的复合材料的拉伸强度和冲击强度分别比纯PEEK高5.7%和20.5%。此外，含0.5 wt% LFG的复合材料具有优异的摩擦磨损性能，其摩擦系数和比磨损率分别比PEEK低27.3%和18.3%。此外，由于LFG能够显著提高熔融沉积成型（FDM）复合材料样品的力学性能，因此该复合材料可作为实用的高性能增材制造材料。
