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Materials 2019, 12(5), 778; https://doi.org/10.3390/ma12050778

Surface Modification of Carbon Fibers by Grafting PEEK-NH2 for Improving Interfacial Adhesion with Polyetheretherketone

1
Key Laboratory of High-Performance Fibers & Products, Ministry of Education, College of Materials Science and Engineering, Donghua University, Shanghai 200051, China
2
Key Laboratory of Shanghai City for lightweight composites, Donghua University Center for Civil Aviation Composites, Donghua University, Shanghai 200051, China
3
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 200051, China
4
Industries Engineering and Technology, University of Gezira, Wad Madani 21111, Sudan
5
Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles, Donghua University, 2999 North Renmin Road, Shanghai 201620, China
*
Author to whom correspondence should be addressed.
Received: 19 February 2019 / Revised: 26 February 2019 / Accepted: 1 March 2019 / Published: 7 March 2019
(This article belongs to the Section Advanced Composites)
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Abstract

Due to the non-polar nature and low wettability of carbon fibers (CFs), the interfacial adhesion between CFs and the polyetheretherketone (PEEK) matrix is poor, and this has negative effects on the mechanical properties of CF/PEEK composites. In this work, we established a modification method to improve the interface between CFs and PEEK based chemical grafting of aminated polyetheretherketone (PEEK-NH2) on CFs to create an interfacial layer which has competency with the PEEK matrix. The changed chemical composition, surface morphology, surface energy, and interlaminar shear strength were investigated. After grafting, the interlaminar shear strength (ILSS) was improved by 33.4% due to the covalent bonds in the interface region, as well as having good compatibility between the interface modifier and PEEK. Finally, Dynamic Mechanical Analysis (DMA) and Scanning Electron Microscopy (SEM) observation also confirmed that the properties of the modified CF/PEEK composites interface were enhanced. This work is, therefore, a beneficial approach towards enhancing the mechanical properties of thermoplastic composites by controlling the interface between CFs and the PEEK matrix. View Full-Text
Keywords: carbon fiber (CF); polyetheretherketone (PEEK); aminated polyetheretherketone (PEEK-NH2); interfacial adhesion carbon fiber (CF); polyetheretherketone (PEEK); aminated polyetheretherketone (PEEK-NH2); interfacial adhesion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hassan, E.A.M.; Elagib, T.H.H.; Memon, H.; Yu, M.; Zhu, S. Surface Modification of Carbon Fibers by Grafting PEEK-NH2 for Improving Interfacial Adhesion with Polyetheretherketone. Materials 2019, 12, 778.

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