General Properties
Short Name:
Name:
PA4.6
Polyamide 4.6
Polyamide 4.6 (PA4.6) is a polycondensation product of tetramethylene diamine and adipic acid. Polyamides derived from diamines and dicarboxylic acids of the type H2N–(CH2)x–NH2 and HOOC–(CH2)y–COOH are designated PAZ1.Z2, where Z1 refers to the number of carbon atoms in the diamine and Z2 to the number of carbon atoms in the dicarboxylic acid (Z1 = x, Z2 = y + 2, see structural formula).
Structural Formula
Properties
| Glass Transition Temperature | 70 to 94°C |
|---|---|
| Melting Temperature | 290 to 295°C |
| Melting Enthalpy | - |
| Decomposition Temperature | 440 to 450°C |
| Young's Modulus | 3300 MPa |
| Coefficient of Linear Thermal Expansion | 70 to 80 *10-6/K |
| Specific Heat Capacity | 2.1 J/(g*K) |
| Thermal Conductivity | 0.3 W/(m*K) |
| Density | 1.18 to 1.21 g/cm³ |
| Morphology | Semi-crystalline thermoplastic |
| General properties | High heat resistance. High stiffness and stability at higher temperatures. Good creep resistance. Good chemical resistance |
| Processing | Extrusion |
| Applications | Mechanical and apparatus engineering. Automotive engineering. Electro and electrical engineering. Fibers, zip ties |
NETZSCH Measurement
| Instrument | DSC 204 F1 Phoenix® |
| Sample Mass | 10.68 mg |
| Isothermal Phase | 5 min |
| Heating/Colling Rates | 10 K/min |
| Crucible | Al, pierced lid |
| Atmosphere | N2 (50 ml/min) |
Evaluation
In this example, an endothermal melting effect was observed with a peak temperature of 292°C (2nd heating, red) and an enthalpy of 91 J/g. The midpoint temperature of 58°C of the glass transition in the 1st heating (blue) increased to 74°C in the 2nd heating (red) as a result of water evaporation (small peak at 129°C with an enthalpy of 0.6 J/g) during the 1st heating. The shoulder at around 240°C prior to the main melting peak in the 1st heating is due to the thermomechanical history of the sample since it was absent in the 2nd heating.