PEEK: Polyetheretherketone

General Properties

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PEEK

Polyetheretherketone


Polyetheretherketone (PEEK) is a very popular high-performance plastic and belongs to the group of polaryletherketones.

Structural Formula


Properties

Glass Transition TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.Glass Transition Temperature145 to 155°C
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Temperature335 to 345°C
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Enthalpy130 J/g
Decomposition Temperature600 to 620°C
Young's Modulus3700 MPa
Coefficient of Linear Thermal Expansion50 to 70 *10-6/K
Specific Heat Capacity-
Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.Thermal Conductivity0.25 W/(m*K)
Density1.32 (semi-cr), 1.27 (am) g/cm³
MorphologyUsually semi-crystalline thermoplastics, but as a thin film generally amorphous
General propertiesGood mechanical properties. High stability and stiffness. High temperature resistance. Good chemical and radiation resistance. Good hydrolysis resistance. Good sliding properties. Good electrical insulation properties
ProcessingInjection molding, extrusion, machining
ApplicationsInstrument and apparatus engineering (plain bearings, gear wheels). Aerospace. Electronics. Medical engineering (surgical devices, implants). Chemical industry

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass10.39 mg
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase3 min / 3 min / 5 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (40 ml/min)