高性能热塑性碳纤维复合材料（CFRTP）普遍存在界面强韧性不足的问题，导致无法最大发挥轻量化设计和服役性能。本项目基于纳米材料-界面多尺度增强的设计理论，利用石墨烯高强度、高模量、比表面积大的性能特点，首先通过化学改性方法制备出可均匀稳定水分散的功能化石墨烯，再经高效的电泳沉积技术实现功能化石墨烯在碳纤维表面的均匀可控沉积，测试CF/PEKK复合材料界面强度和韧性等力学性能，进一步结合先进的表界面分析技术深入研究电泳沉积功能化石墨烯对碳纤维表面宏/微观构性、本体强度以及对复合材料界面结构和性能的影响规律，揭示电泳沉积功能化石墨烯改性复合材料表界面构性关系，阐明该体系界面多尺度增强增韧机理。项目预期成果将显著提高CF/PEKK复合材料的界面强度和韧性，在获得高效可靠的界面改性技术同时能进一步丰富CFRTP界面多尺度改性理论，为提高我国CFRTP结构件在重大领域中的应用水平提供理论指导。

High-performance carbon fiber reinforced composites have promising applications in the fields aerospace and industries, but the poor interfacial adhesion properties of carbon fiber reinforced thermoplastic composites (CFRTP) result in failure to develop lightweight design and high service performance. This project aims at solving the problem, based on the design concept of nano-multiscale interphase of composites. The graphene with pretty high strength, modulus and specific surface area are chemically modified by covalent methods to make functionalized graphene with different groups. The different functionalized graphene have high chemical activity and good solubility in aqueous solutions. Then the functionalized graphene is deposited on the surface of carbon fibers by electrophoretic deposition method. The interfacial adhesion strength and toughness of the functionalized graphene modified CF/PEKK thermoplastic composites are measured and the influence of the functionalized graphene on the surface and bulk properties of carbon fibers and on the interfacial structures and properties of CF/PEKK composites are further investigated combining with advanced techniques of surface and interface analyses. On the basis of the above, the structure-property relations of the interface are established and the strengthening and toughening mechanisms are revealed. The expected results of the project will considerably improve the interfacial adhesion strength and toughness of CF/PEKK composites, and gain effective and reliable techniques of interfacial modification. Furthermore, the multi-scale interfacial modification theories of CFRTP will be enriched and developed, and contribute to the high-level applications of CFRTP structures in some important fields of our country.