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Polyetherketone (PEK)
Polyetherketones (PEK), are a class of high performance, semi-crystalline engineering thermoplastics having a unique combination of thermal stability, chemical resistance, and excellent mechanical properties over a wide temperature range. This class of polymers has also good resistance to combustion and good electrical performance.
The high thermal stability is provided by the diphenylene ketone group. It imparts high strength and high resistance to oxidation, but makes the polymer rigid. Flexibility in the backbone of the polymer is provided by ether linkage(s). These ether linkages also add to the thermal stability. Some types, like PEEK, are extremely tough and have very high impact strength. Due to the semi-crystalline nature of these polymers, a high degree of mechanical properties is retained close to their melting temperature. They also have very low tendency to creep and good sliding and wear properties. However, they exhibit poor resistance to weathering.
Most grades can be fabricated by conventional thermoplastic processing methods, such as extrusion and compression molding, and can be also used as matrix resins for high performance reinforced composites.
| General Properties : | ||
|---|---|---|
| Modulus of elasticity (E) | 3700 N · mm-2 | |
| Tensile strength | 100 N · mm-2 | |
| Elongation | 50% | |
| Impact strength | 55 k J · m-2 | |
| Glass transition temperature | 130 … 150 ° C | |
| Thermal conductivity | 0.25 W / m·K | |
| Linear thermal expansion coefficient | 1.7 × 10-5 / K | |
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