December 13, 2024 – Recent advancements in the modification technology of Polyetheretherketone (PEEK) have once again captured the attention of the chemical industry. As a high-performance polymer, PEEK’s modification research continues to evolve, aiming to enhance its mechanical properties, tribological performance, and biocompatibility through innovative approaches to meet the demands of various applications.
In the realm of filled modifications, researchers have significantly improved PEEK’s mechanical properties by incorporating substances such as fibers, salts, and graphite. Carbon fiber (CF), known for its high stiffness, strength, and low thermal expansion coefficient, stands out as the preferred choice for reinforcing thermoplastic polymer composites. Glass fiber (GF) also plays a crucial role in polymer reinforcement, thanks to its high modulus and load-bearing capacity. Furthermore, the addition of ceramic particles like ZrO2 and SiO2 has further elevated PEEK’s mechanical and tribological performance.
On the other hand, blend modification offers an alternative effective method for PEEK modification. This approach, based on the principle of similar compatibility, involves mixing PEEK with other polymers such as Polytetrafluoroethylene (PTFE) and Polyethersulfone (PES) to tailor PEEK’s properties for specific applications. The incorporation of PTFE reduces the composite’s coefficient of friction, enhancing its wear resistance. Meanwhile, blending with PPS and PESU notably boosts PEEK’s tensile strength and impact resistance, thereby broadening its application horizons.
However, blend modification, while effective, does come with limitations. It restricts the addition of inorganic fillers, metals, and oxides, which in turn hinders further improvements in PEEK’s hardness and strength. To overcome this bottleneck, interface modification techniques have emerged.
Interface modification involves altering the microscopic morphology and molecular structure of PEEK resin or the reinforcing phase surface through physical or chemical methods, thereby enhancing the interfacial adhesion of the composite. Techniques such as plasma treatment, radiation treatment, chemical solution treatment, and slurry coating modification each have unique advantages and can be tailored to meet specific PEEK material requirements. Notably, in the medical field, radiation treatment enhances PEEK’s surface activity, improving its biocompatibility and promoting osteogenic differentiation of stem cells, thus offering new possibilities for applications like artificial joints and implants.
In conclusion, the modification technology of PEEK materials is advancing towards diversification and precision. With continuous research and technological innovations, PEEK is poised to demonstrate its unique advantages and vast application potential in even more fields.