Several common interface modification methods for carbon fiber reinforced thermoplastic composites

Several common interface modification methods for carbon fiber reinforced thermoplastic composites
High performance thermoplastic composite materials such as carbon fiber reinforced polyether ether ketone (PEEK), polyphenylene sulfide (PPS), thermoplastic polyimide (TPI), and polyether sulfone (PES) have advantages such as high heat resistance, good corrosion resistance, high strength, high toughness, and recyclability. Compared with thermosetting carbon fiber reinforced resin based composite materials, they have broader application prospects in fields such as rail transit, aerospace, and high-end medical care. Based on Loong Carbon Fiber's years of experience in processing carbon fiber parts, there are many factors that can affect the performance of thermoplastic carbon fiber composite materials, among which the interface between carbon fiber and thermoplastic resin is one of the important factors.
The significance of interface modification of carbon fiber thermoplastic composite materials:
The interface of composite materials is the third phase formed between fibers and resin matrix through a series of physical and chemical interactions. Among them, high-performance thermoplastic resin is used as the continuous phase, carbon fiber is used as the reinforcing phase, and they are bonded through an interfacial layer. The interface phase serves as a link for stress transmission between fibers and resins, directly affecting the transmission and dispersion of internal stress. The propagation and suppression of damage play a decisive role in the overall performance of composite materials.

In addition, the physical and chemical properties of carbon fiber and resin matrix themselves also have an important impact on the formation of interfacial microstructure and interfacial properties of carbon fiber composite materials. Carbon fiber has a smooth surface, high chemical inertness, and low surface energy, making it difficult to form effective interfacial bonding with resin. Therefore, surface treatment of carbon fibers is essential. At present, the surface treatment methods for carbon fiber mainly focus on optimizing and designing the active chemical groups and surface morphology of carbon fiber, increasing its chemical activity, surface roughness, and surface free energy, thereby improving the chemical bonding and mechanical meshing between carbon fiber and resin matrix, as well as the wettability between carbon fiber and high-performance thermoplastic resin, and ultimately enhancing the interfacial bonding performance of composite materials.