General Properties
Short Name:
Name:
PC
Polycarbonate
Polycarbonate (PC) belongs chemically to the polyesters.
Structural Formula
Properties
| Glass Transition Temperature | 140 to 150°C |
|---|---|
| Melting Temperature | - |
| Melting Enthalpy | - |
| Decomposition Temperature | 480 to 535°C |
| Young's Modulus | 2200 to 2400 MPa |
| Coefficient of Linear Thermal Expansion | 75 to 80 *10-6/K |
| Specific Heat Capacity | 1.17 to 1.50 J/(g*K) |
| Thermal Conductivity | 0.19 to 0.21 W/(m*K) |
| Density | 1.20 to 1.24 g/cm³ |
| Morphology | Amorphous thermoplastic |
| General properties | Medium to high stability and stiffness. Very good impact strength. Weather and radiation resistant. High transparency. Very good electrial insulating properties |
| Processing | Injection molding, extrusion, deep drawing |
| Applications | Electronic components. Building sector. Optical storage media, like CD, DVD, Blue-Ray Disc Automobile, plane and safety components. Medical applications. Cellular phones. Products of daily life like, e.g., food containers |
NETZSCH Measurement
| Instrument | DSC 204 F1 Phoenix® |
| Sample Mass | 12.84 mg |
| Isothermal Phase | 3 min / 5 min |
| Heating/Colling Rates | 10 K/min |
| Crucible | Al, pierced lid |
| Atmosphere | N2 (50 ml/min) |
Evaluation
Polycarbonates are generally amorphous. For this reason, the DSC curves (in both the 1st and 2nd heating) show only a glass transition eff ect. The corresponding glass transition temperatures (midpoints) are very close to each other in both heatings at 147°C (2nd heating, red) and 148°C (1st heating, blue); the step heights (Δcp) are also similar. Both glass transition were overlapped by 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 effects.