Functional Engineering Plastics: Injection Molded PEEK/MWCNT Composites
Depending on the specific application, engineering plastic materials can be modified to obtain additional functional properties. When a plastic material is enhanced through specific methods, such as the introduction of functional additives, the resulting material is often referred to as a functional engineering plastic. These materials are used in a wide range of applications where standard plastic performance is no longer sufficient.
Functional engineering plastics may be developed to improve conductivity, wear resistance, load-bearing capacity, thermal stability, or other performance characteristics. As product requirements continue to increase in industrial and engineering applications, these advanced plastic materials have become increasingly important.
PEEK/MWCNT Functional Composite Materials
Polyetheretherketone, commonly known as PEEK, is a high-performance engineering plastic widely used in demanding applications because of its strength, temperature resistance, chemical resistance, and dimensional stability. To further improve its functional properties, composite modification can be applied by introducing reinforcing or conductive additives.
One example is the preparation of PEEK composites with multi-walled carbon nanotubes, or MWCNTs, through injection molding. Research carried out by the School of Textile and Materials Engineering of Dalian University of Technology together with Dalian Luyang Technology Development Co., Ltd. showed that the introduction of hydroxyl and carboxyl functional groups can significantly improve interfacial performance in PEEK/MWCNT composites.
Effect of MWCNT Content on Composite Performance
As the content of MWCNTs increases, the surface resistivity and wear of the composite decrease significantly, while the mechanical properties are also improved. This means that the modified material can achieve better conductivity-related performance, stronger wear resistance, and improved overall structural behavior compared with pure PEEK.
After adding carboxyl-functionalized MWCNTs, a percolation phenomenon was observed. The percolation threshold was reported at 3 percent, and the surface resistivity reached 1.89 × 106 ohms. At the same time, the friction coefficient was reduced, and the load-carrying capacity increased by more than two times.
When the mass fraction of MWCNTs-COOH reached 4 percent, the wear amount was reported as 0.6 mg, which was 71.4 percent lower than that of pure PEEK. Under these conditions, the composite showed the best overall performance among the tested formulations.
Why Functional Engineering Plastics Matter
Functional engineering plastics are important because they help bridge the gap between conventional polymer materials and higher-performance engineering requirements. By introducing functional additives and controlling composite structure, materials can be tailored for more demanding applications involving wear resistance, conductivity, strength, and long-term durability.
For product developers and manufacturers, this kind of material optimization opens more possibilities for replacing metal parts, improving component performance, and achieving better balance between functionality and manufacturability.
Injection Molding and Advanced Material Applications
Injection molding remains an important processing method for functional engineering plastics because it supports repeatable part production and practical application of modified polymer materials. For high-performance composite materials, mold design, material preparation, and molding process control all play an important role in achieving stable product quality.
FITMOLD supports custom plastic part development and injection mold manufacturing for projects that require practical engineering consideration, manufacturability review, and production-oriented support. For advanced engineering plastic applications, early evaluation of material behavior and processing feasibility is especially important.
If you are looking for a manufacturing partner for custom plastic parts and injection mold development, FITMOLD can support your project from design review to tooling and production.
Contact us: sales@fitmold.com