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Interface Modifications of Carbon Fiber Reinforced Polyetheretherketone

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Interface Modifications of Carbon Fiber Reinforced Polyetheretherketone (CF/PEEK) Composites with Thermoplastic Sizing Agents

 

Carbon fiber reinforced polyetheretherketone (CF/PEEK) has been receiving much interest in aviation applications, due to excellent balance of properties, including high thermal stability, good solvent resistance, high stiffness and toughness. However, interlaminar shear strength (ILSS) for the composites usually needs improving because the interfacial adhesions between carbon fiber (CF) and polyetheretherketone (PEEK) matrix are relatively weak. In this paper, interfacial modifications between CF and PEEK have been studied. Nitric acid with high temperature were used to activate functional groups on surface of CF, while γ-methacryloxypropyltrimethoxysilane (KH570) and sulfonated polyetheretherketone (SPEEK) were coated respectively on activated CF. The surface characteristics of modified CF were characterized by X-ray photoelectron spectroscopy (XPS). Results of mechanical tests showed that the interlaminar shear strength (ILSS) increased by 56.18 % for CF coated with KH570 and 64.88 % for CF coated with SPEEK, compared with that without treatment. This represents obvious enhancements of interfacial bonding between CF and PEEK matrix. The storage modulus of composites containing CF modified with SPEEK were also higher than that containing non-treated CF or activated CF. SEM observations on the fractural surfaces showed that for the samples containing CF coated with SPEEK, each CF was covered with substantial PEEK matrix, indicating efficient modifications on the adhesion between CF and PEEK.

 

Author: Shu Zhu

 

Conference: SAMPE Seattle 2017

 

SKU/Code: SE17--0599

Pages: 10

 

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