PEKEKK: Polyacryletherketone- etherketoneketone

Short Name
Polyacryletherketone- etherketoneketone
HTRTP - High-Temperature Resistant Thermoplastics
General Properties
Chemical Formula
Structural Formula


Glass Transition Temperature
165 to 175 °C
Melting Temperature
380 to 390 °C
Melting Enthalpy
60 J/g
Decomposition Temperature
580 to 600 °C
Young's Modulus
4300 MPa
Coefficient of Linear Thermal Expansion
45 *10¯6/K
Specific Heat Capacity
- J/(g*K)
Thermal Conductivity
0.29 W/(m*K)
1.3 g/cm³
Semi-crystalline thermoplastic
General properties
Good mechanical properties. High temperature and heat resistance. Good chemical resistance. Low humidity absorption. Good electrical insulation. Good dimensional stability
Extrusion, injection molding
Mechanical engineering. Transportation and conveyor technique. Automobile industry. Chemical plant construction

Internet Links

NETZSCH Measurements

DSC 204 F1 Phoenix®
Sample Mass
10.69 mg
Isothermal Phase
3 min/5 min
Heating/Colling Rates
10 K/min
Al, pierced
N2 (40 ml/min)


Since the polymer is semi-crystalline, it exhibits both a melting transition and a glass transition. The glass transition for the example occurred at approx. 168°C (2nd heating, green, midpoint), and the melting transition at 387°C (peak temperature,
2nd heating).
The melting enthalpy increased from 47 J/g in the 1st heating (blue) to approx. 59 J/g in the 2nd heating, reflecting an increase in the crystalline content of the polymer. The height of the glass transition step (Δcp), normally a measure of the
amorphous content in the sample, remained nearly constant. The small shift of the melting temperature (peak temperature) between the 1st and 2nd heatings of nearly 2 K is due to the better contact between the sample and crucible bottom after the first melting.

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