基于活性自由基聚合的梳型聚合物/碳纤维多尺度增强体制备及其复合材料界面增强机理研究

碳纤维作为一种重要的增强材料在航空航天、汽车、船舶等领域有重要应用。通过对碳纤维表面进行改性以改善其与树脂基体的界面性能，进而提高复合材料的整体性能是目前研究的重要方向。本项目拟通过活性自由基聚合法将具有梳型结构的聚合物以化学键连接的形式接枝到碳纤维表面，并利用活性自由基聚合的可控性，对碳纤维表面接枝聚合物的结构进行设计，制备出具有特殊化学结构和物理形貌的梳型聚合物/碳纤维多尺度增强体，实现碳纤维表面结构形貌的可设计性。将此增强体与环氧树脂复合制备复合材料体系，通过研究复合材料的界面力学性能、界面微观结构以及断口形貌，系统研究这种多尺度增强体对复合材料界面性能的增效机制，揭示此新型复合材料高界面性能产生的原因，建立此新型复合材料"工艺-微结构-材料性能"之间的关系。本项目研究成果对于获得新型高性能纤维增强聚合物基复合材料以及解决复合材料界面强度低、抗冲击性能差等问题具有重要意义。

As an important reinforcing material the carbon fiber（CF）is widely used in many fields such as aerospace industry, automotive industry, steamship industry, petroleum industry and chemical industry. In recent years, a tremendous amount of work had been done on the surface modification of carbon fiber to increase the interfacial properties between carbon fiber and resin matrix. To prepare a comb-like polymer/carbon fiber multi-scale reinforcement, the comb-like polymer will be grafted from the carbon fiber surface via living radical polymerization (LRP) in this project. These living radical polymerizations have enabled the control of polymer molecular weights and the synthesis of well-defined polymers, which can be used to design and fabricate the surface morphology and structure of multi-scale reinforcement. Then we will prepare comb-like polymer/carbon fiber multi-scale reinforcement composites by using the epoxy resin as matrix. The interfacial properties, interfacial microstructure and fracture morphology of this composite will be also discussed to study the interfacial reinforcing mechanisms of the composites. Finally, we want to reveal the cause of the improvement of interfacial properties and establish the processing-microstructure-property relationship. The research results of this project are not only of great significance for the preparation of high-performance fiber-reinforced polymer composites, but also of great importance to the improvement of interfacial strength and impact resistance of composites.