General Properties
Short Name:
Name:
PEKEKK
Polyacryletherketoneetherketoneketone
Just like PEEK, PEKEKK belongs to the polyacrylics, the molecular backbone of which alternatingly contains ketone and ether groups. Their 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 temperature depends on the amount of keto groups (-C=O)*.
Structural Formula
Properties
NETZSCH Measurement
| Instrument | DSC 204 F1 Phoenix® |
| Sample Mass | 10.69 mg |
| IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase | 3 min / 5 min |
| Heating/Colling Rates | 10 K/min |
| Crucible | Al, pierced lid |
| Atmosphere | N2 (40 ml/min) |
Evaluation
Since the polymer is semi-crystalline, it exhibits both a melting transition and a 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. The 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 for the example occurred at approx. 168°C (2nd heating, red, 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 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 step (Δcp), normally a measure of the amorphous content in the sample, remained nearly constant. The small shift of the 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 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.