期刊
APPLIED COMPOSITE MATERIALS
卷 29, 期 2, 页码 745-764出版社
SPRINGER
DOI: 10.1007/s10443-021-09995-8
关键词
Adhesion; Fibers; Microstructure; Strength; Surfaces
资金
- Strategic Priority Research of Programme of Chinese Academy of Sciences [XDA17020405]
- Science and Technology Innovation 2025 Major Project of Ningbo [2019B10091]
- Key Project of Natural Science Foundation of Ningbo [202003N4027]
- Key Research and Development Program of Zhejiang Province [2021C01004]
The two-step surface treatment on high strength and high modulus carbon fibers improved the interfacial properties of polyetherketoneketone (PEKK) matrix composites. While thermoset epoxy (EP) sizing agents led to increased interlaminar shear strength (ILSS) due to hydrogen bonding, thermoplastic polyetherimide (PEI) sizing agents showed the best ILSS value in PEKK composites with HSHM-CFs.
A two-step surface treatment was conducted on high strength and high modulus carbon fibers (HSHM-CFs) to enhance the interfacial properties of polyetherketoneketone (PEKK) matrix composites. In the two-step surface treatment, the surfaces of HSHM-CFs were electrochemically oxidized followed by sizing treatment. Thermoset epoxy (EP) sizing agents and thermoplastic polyetherimide (PEI) sizing agents were utilized for comparison. Results showed that PEI sizing agents had better wetting effects than EP sizing agents. The sizing process led to increases in fiber strength due to healed surface flaws and inhibited micro-crack initiation. Although EP sizing agents were incompatible with PEKK matrix, the interlaminar shear strength (ILSS) of PEKK matrix composites reinforced by EP-sized fibers still increased, compared with that by untreated fibers, due to hydrogen bond and weak chemical reactions between HSHM-CFs and PEKK matrix. The strong interaction between PEI sizing agents and HSHM-CFs, diffusion and entanglement as well as the non-covalent pi-pi interaction between PEI sizing agents and PEKK matrix resulted in highest ILSS value of PEI-sized HSHM-CF/PEKK composites.
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