General Properties
Short Name:
Name:
PA6/6T
Polyamide 6/6T
Like PA6/3T, polyamide 6/6T belongs to the semi-aromatic polyamides but is semi-crystalline. It is a copolymer made from caprolactam, hexamethylene diamine and terephthalic acid (therephthalic acid is represented by the letter T).
Structural Formula
Properties
| Glass Transition Temperature | 60 to 100°C |
|---|---|
| Melting Temperature | 250 to 300°C |
| Melting Enthalpy | - |
| Decomposition Temperature | 460 to 480°C |
| Young's Modulus | 3500 to 3600 MPa |
| Coefficient of Linear Thermal Expansion | 70 *10-6/K |
| Specific Heat Capacity | - |
| Thermal Conductivity | - |
| Density | 1.18 g/cm³ |
| Morphology | Semi-crystalline polymer |
| General properties | High mechanical stability. High chemical resistance. High toughness in the cold. Higher temperature resistance than PA6 or PA6.6 |
| Processing | Injection molding |
| Applications | Electrical engineering/electronics (gear wheels, plug connectors…). Axes. Fishing equipment |
NETZSCH Measurement
| Instrument | DSC 204 F1 Phoenix® |
| Sample Mass | 12.29 mg |
| Isothermal Phase | 5 min |
| Heating/Colling Rates | 10 K/min |
| Crucible | Al, pierced lid |
| Atmosphere | N2 (50 ml/min) |
Evaluation
The large 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 overlapping the glass transition (midpoint: 61°C) in the 1st heating (blue) indicates that this polymer sample had been tempered in a temperature range of 40°C to 50°C or had been stored in that temperature range for a long period of time. Due to the elimination of water (broad peak from approx. 90°C to 180°C) during the 1st heating, the glass transition shifted to 101°C (midpoint) in the 2nd heating (red). In the 2nd heating (red), the sample melting began after a small exothermal post-crystallization (peak: 141°C) following the glass transition; the temperature of the main peak was 299°C. The corresponding melting enthalpy amounted to 40 J/g. In the first heating, the total melting enthalpy was 29 J/g and thus a bit lower than in the 2nd heating, indicating that additional crystallization had occurred during the intervening cooling segment. Nevertheless, the melting temperature (peak temperature) of 298°C was similar to that in the 2nd heating.