PESU: Polyethersulfone

General Properties

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PESU

Polyethersulfone


Polyethersulfone (PESU) is an amorphous, aromatic high-temperature polymer and belongs to the group of polysulfones; it is, however, superior to pure polysulfone with respect to chemical resistance and impact strength.

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 Temperature225 to 230°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 Temperature-
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 Enthalpy-
Decomposition Temperature580 to 595°C
Young's Modulus2600 to 2800 MPa
Coefficient of Linear Thermal Expansion (CLTE/CTE)The coefficient of linear thermal expansion (CLTE) describes the length change of a material as a function of the temperature.Coefficient of Linear Thermal Expansion60 *10-6/K
Specific Heat Capacity1.37 J/(g*K)
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 Conductivity0.18 W/(m*K)
DensityThe mass density is defined as the ratio between mass and volume. Density1.37 g/cm³
MorphologyAmorphous material
General propertiesHigh stability, stiffness and hardness. High deformation resistance. Very good heat and OxidationOxidation can describe different processes in the context of thermal analysis.oxidation resistance. Good electrical insulation properties. Hydrolysis-resistant to aqueous and alkaline media
ProcessingExtrusion, injection molding
ApplicationsInstrument and apparatus engineering. Automobile and aircraft industry. Electrical and electronical components. Medical engineering. Photo equipment

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass12.66 mg
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase5 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (40 ml/min)

Evaluation

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 of the amorphous PESU occurred at 228°C (midpoint) with a step height of 0.23 J/(g*K) and 0.24 J/(g*K) in the 1st (blue) and 2nd heating (red), respectively. In the DSC curve of the 2nd heating, 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 is overlapped by a small RelaxationWhen a constant strain is applied to a rubber compound, the force necessary to maintain that strain is not constant but decreases with time; this behavior is known as stress relaxation. The process responsible for stress relaxation can be physical or chemical, and under normal conditions, both will occur at the same time. relaxation peak, indicating the presence of ordered regions within the amorphous matrix that formed during the controlled cooling at 10 K/min.