Interlaminar improvement of carbon fiber/epoxy composites via fluorine‐containing high‐epoxy‐value sizing agent

To improve the interfacial bonding effect of carbon fibers (CFs) and epoxy resins, we prepared a fluorine‐containing high‐epoxy‐value sizing agent (named TS) in this article. It is an emulsion with a more uniform particle size distribution and higher stability better than a commercial Takemoto sizin...

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Bibliographic Details
Published in:Journal of applied polymer science 2022-08, Vol.139 (30), p.n/a
Main Authors: Qiu, Zhijie, Wang, Yilei, Li, Chengsen, Yuan, Xiaomin, Zhu, Bo, Liu, Jianjun
Format: Article
Language:English
Subjects:
Activated carbon
Bonding agents
Carbon
Carbon fiber reinforced plastics
coatings
Composite materials
composites
Contact angle
Epoxy resins
Fluorine
Fourier transforms
Infrared analysis
Infrared spectroscopy
Interfacial bonding
Interfacial shear strength
Materials science
Particle size distribution
Photoelectrons
Photon correlation spectroscopy
Polymers
Reagents
Shear strength
Sizing
Spectrum analysis
Sulfonic acid
surfaces and interfaces
Tensile tests
Thermogravimetric analysis
Wettability
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Summary:To improve the interfacial bonding effect of carbon fibers (CFs) and epoxy resins, we prepared a fluorine‐containing high‐epoxy‐value sizing agent (named TS) in this article. It is an emulsion with a more uniform particle size distribution and higher stability better than a commercial Takemoto sizing agent. In addition, sulfonic acid groups can improve the hydrophilicity of the TS, and the presence of epoxy groups enhances the wettability between CFs and the matrix. The properties of the sizing agents were examined by Fourier transform infrared spectroscopy, dynamic light scattering, and thermogravimetric analysis. The sized CFs were evaluated by scanning electron microscopy, x‐ray photoelectron spectroscopy, monofilament tensile test, and dynamic contact angle. Afterward, CF/epoxy composites were prepared, and their fracture morphology and interlaminar shear strength (ILSS) were examined. Results indicated that the TS sizing significantly increased the content of activated carbon on the surface of the CFs and improved the bonding effect between the fiber and the matrix. After TS was sized, the ILSS increased from 49.64 to 58.74 MPa, 18.34% higher than unsized CF/epoxy composites, showing the prominent interfacial reinforcement better than commercial Takemoto.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.52665