Improving the Interfacial Adhesion of Carbon Fiber/Polyether Ether Ketone Composites by Polyimide Coating. Issue 19 (15th May 2020)

• Record Type: Journal Article
• Authors: Wang, Tao; Jiao, Yongsheng; Mi, Zhiming; Wang, Chunbo; Wang, Daming; Zhao, Xiaogang; Zhou, Hongwei; Chen, Chunhai
• Is Part Of: ChemistrySelect. Volume 5:Issue 19(2020)
• Page Start: 5507
• Page End: 5514
• Publication Date: 2020-05-15
• Subjects: Composite materials -- Carbon fibers -- Polymeric composites -- Interfacial properties; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202001232
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Polyimide (PI) as a sizing agent for short carbon fiber (SCF) was explored, and a series of SCF‐reinforced polyether ether ketone (PEEK) composites with PI sizing concentrations varying from 0 to 2.0 wt % were fabricated using the extrusion and injection molding techniques. It was found that the PI sizing layer forms homogeneously and compact on the SCF surfaces, and when the PI sizing concentrations was 1.0 wt %, the tensile strength and flexural strength of the corresponding SCF/PEEK composite was significantly increased by 16.8 % and 8.2 % respectively in comparison with the untrelated case. Additionally, dynamic mechanical analysis (DMA) curves demonstrated that storage modulus of SCF/PEEK composites were enhanced with the increasing concentration of PI sizing, resulting the higher stiffness and the lower damping behavior of the composites. Further, the single fiber pull‐out testing was also measured, with the increased interfacial shear strength (IFSS) of CF/PEEK composites by 24.8 % from 70.6 to 88.1 MPa for the CF modified with 1.0 wt % PI sizing, which illustrated that PI sizing can improve fiber surface wettability and interfacial adhesion between CF and PEEK. Abstract : This paper reports the effects of polyimide sizing modification of carbon fiber (CF) on the interfacial properties of CF‐reinforced polyether ether ketone (PEEK) composites. Versus untreated short carbon fiber (SCF)‐reinforced PEEK composites, composites containing 1.0 wt % PI coating on SCFs demonstrated maximum improvements in tensile strength and flexural strength for 16.8 %, and 8.2 %, respectively. In addition, the interfacial shear strength (IFSS) of CF/PEEK composites was increased from 70.1 MPa to 88.1 MPa (24.8 %) for the modified CF with 1.0 wt % polyimide (PI) sizing.