General Properties
Short Name:
Name:
PSU
Polysulfone
Polysulfone belongs to the family of polyaryl sulfones and is a high-performance thermoplastic material. Due to its molecular structure, it is transparent. Polyethersulfone (PESU) and polyphenylsulfones (PPSU) also belong to the family of polyaryl sulfones.
Structural Formula
Properties
| Glass Transition Temperature | 185 to 190°C |
|---|---|
| Melting Temperature | - |
| Melting Enthalpy | - |
| Decomposition Temperature | 530 to 540°C |
| Young's Modulus | 2500 to 2700 MPa |
| Coefficient of Linear Thermal Expansion | 50 to 60 *10-6/K |
| Specific Heat Capacity | 1.37 J/(g*K) |
| Thermal Conductivity | 0.15 W/(m*K) |
| Density | 1.24 to 1.25 g/cm³ |
| Morphology | Amorphous polymer |
| General properties | High stability and stiffness. Good toughness. Good chemical resistance. Low water absorption. Very good electrical insulation properties |
| Processing | Injection molding, extrusion for the production of thin films |
| Applications | Electrical engineering (e.g., condensators). Medical engineering. Food technology. Aerospace (helmets). Chemical and laboratory equipment |
NETZSCH Measurement
| Instrument | DSC 204 F1 Phoenix® |
| Sample Mass | 12.52 mg |
| Isothermal Phase | 3 min / 3 min / 5 min |
| Heating/Colling Rates | 10 K/min |
| Crucible | Al, pierced lid |
| Atmosphere | N2 (40 ml/min) |
Evaluation
Since PSU is entirely amorphous, the DSC curves above show only one glass transition with a glass transition midpoint temperature at 187°C in the 2nd heating (red) and 188°C in the 1st heating (blue). The glass transition in the 2nd heating is overlapped by a larger 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 than in the 1st heating. This indicates an increase in short-range order during the controlled cooling at 10 K/min than was originally present in the material. The heights of the glass transition steps of 0.24 J/(g*K) (1st heating) and 0.25 J/(g*K) (2nd heating) are nearly identical.