Improvement of the interfacial properties of CF/PEEK composites by introducing aminated polyphenylene sulphide (PPS‐NH₂) as a sizing agent

Abstract

The resin matrix and CF fibers itself of CF/PEEK composites exhibit surface inertness, resulting in poor interface bonding between CF and PEEK matrix. This phenomenon seriously affects the mechanical properties of CF/PEEK composites especially the interlaminar shear strength (ILSS). In order to improve the interfacial properties of CF/PEEK composites, a novel sizing agent of CF fibers namely PPS‐NH2 was synthesized, and its influence on the fibers–matrix interface interaction and properties of CF/PEEK composites was investigated by using scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, atomic force microscopy. The results showed that the interface of CF/PEEK composite was improved by coating PPS‐NH2 sizing agent on the surface of CF. When the amination degree of PPS‐NH2 reaches 31.25%, the ILSS, flexural strength and modulus of CF/PEEK Composites reach 73.9 MPa (119%), 671.4 MPa (63%) and 32.8GPa (51%) and, respectively. At the same time, the main failure mechanism of CF/PEEK composites changes from fibers–matrix debonding into interface layer deformation and resin fracture. This method can effectively improve the interface defects between CF/PEEK composites.

One-Step Synthesis of Cellulosed-Based Nitrogen-Doped Carbon Aerogel and Its CO2 Adsorption Performance

“…The oxygen-containing functional groups exist on the surface of both CA and CNCA-750, such as –OH around 3430 cm –1 , –CO around 1700 cm –1 , and –COOR around 1100 cm –1 . In addition to physical properties (such as specific surface area, pore size, and pore volume), chemical composition can also significantly affect the adsorption of CO 2 , such as the above oxygen-containing functional groups, which is an important reason why both CA and CNCA-750 do not have low CO 2 adsorption performance. , However, CNCA-750 has more absorption peaks than CA because it contains a large number of nitrogen-containing functional groups, and the new absorption peaks appeared at 1030 cm –1 (−NH 2 ) and 3400 cm –1 (C–N) in CNCA-750 spectra.…”

Carbon fiber‐reinforced epoxy composite properties improvement by incorporation of polydopamine sizing at fiber–matrix interface

“…According to the contact angle of the CF under two different test liquids, the surface energy is calculated by Formula (1) and (2). [28] γ…”

Study of the influence of PPS, PAEK, and PEEK thermoplastic matrices on the static mechanical behavior of carbon fiber‐reinforced composites

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