Polyetherketone

Polyetherketone (PEK) is a high-performance engineering thermoplastic known for its exceptional mechanical properties and thermal stability. It is a member of the polyaryletherketone family, which includes other notable polymers such as polyetheretherketone (PEEK) and polybenzimidazole (PBI).

PEK is synthesized by the polycondensation of aromatic diols and aromatic dicarboxylic acids or their derivatives. This reaction results in a linear polymer chain with alternating ether and ketone groups. The most common method for producing PEK involves the reaction of 4,4'-diaminodiphenyl ether (DDE) with terephthalic acid (TPA) or its derivatives.

One of the key advantages of PEK is its high glass transition temperature (Tg), which can exceed 200°C, making it suitable for applications requiring high-temperature resistance. PEK also exhibits excellent mechanical properties, including high tensile strength, modulus, and impact resistance. These properties make PEK a suitable material for various industrial applications, such as aerospace components, automotive parts, and high-temperature electrical insulation.

PEK has a relatively low moisture absorption rate compared to other high-performance polymers, which contributes to its dimensional stability and resistance to creep. However, it is important to note that PEK is not as chemically resistant as some other engineering thermoplastics, such as PEEK and PBI.

The processing of PEK typically involves melt processing techniques, such as injection molding and extrusion. However, due to its high melting point (around 400°C), specialized processing equipment and conditions are required. PEK can also be processed using solution casting and other wet processing methods.

In summary, polyetherketone is a high-performance engineering thermoplastic with unique properties that make it suitable for a variety of demanding applications. Its high thermal stability, mechanical strength, and resistance to creep are particularly noteworthy. However, its chemical resistance is not as high as some other high-performance polymers, and specialized processing techniques are required.