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Polyetherketoneketone (PEKK) is a semi-crystalline 
thermoplastic
A thermoplastic, or thermosoft plastic, is any plastic polymer material that becomes pliable or moldable at a certain elevated temperature and solidifies upon cooling.
Most thermoplastics have a high molecular weight. The polymer chains associate ...
in the polyaryletherketone Polyaryletherketone (PAEK) is a family of semi-crystalline thermoplastics with high-temperature stability and high mechanical strength whose molecular backbone contains alternately ketone (R-CO-R) and ether groups (R-O-R). The linking group R betw ...
(PAEK) family of polymers. It possesses high heat, chemical, and mechanical load resistance. PEKK has a glass transition temperature
The glass–liquid transition, or glass transition, is the gradual and reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle "glassy" state into a viscous or rubb ...
(Tg) of 162 °C.
Applications
Hexcel Corporation (Formerly Oxford Performance Materials) manufactures PEKK-based parts forBoeing
The Boeing Company () is an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, telecommunications equipment, and missiles worldwide. The company also provides leasing and product ...
for use in its Starliner space taxis, using 3D printing
3D printing or additive manufacturing is the Manufacturing, construction of a three-dimensional object from a computer-aided design, CAD model or a digital 3D modeling, 3D model. It can be done in a variety of processes in which material is ...
-based additive manufacturing. It has wide dental and medical applications. The parts are claimed to be as strong as aluminum
Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It has ...
while being 40 percent of the weight. In addition, PEKK manufactured components have shown fire and radiation resistant properties.
References