General Properties
Short Name:
Name:
PA11
Polyamide 11
Polyamide 11, also often referred to as nylon 11, belongs to the group of linear aliphatic polymers with regularly repeating carbonamide groups -CO−NH- along the main chain. For all polyamides, which can be derived from amino-carbon acids of the type H2N–(CH2)x–COOH or the corresponding lactams, the associated number Z (here 11) refers to the amount of carbon atoms in the monomer (Z = x+1, see structural formula).
Structural Formula
Properties
| Glass Transition Temperature | 40 to 55°C |
|---|---|
| Melting Temperature | 180 to 190°C |
| Melting Enthalpy | 224 J/g |
| Decomposition Temperature | 430 to 455°C |
| Young's Modulus | 1400 MPa |
| Coefficient of Linear Thermal Expansion | 85 to 120 *10-6/K |
| Specific Heat Capacity | 1.26 J/(g*K) |
| Thermal Conductivity | 0.23 to 0.28 W/(m*K) |
| Density | 1.03 to 1.05 g/cm³ |
| Morphology | Semi-crystalline thermoplastic |
| General properties | Good combination of stability, toughness and hardness. High aging resistance. Good chemical resistance. Low water absorption compared to other polyamide types |
| Processing | Extrusion |
| Applications | Transportation, Packaging, tubes and films, Medicine, Electrical and electronics industry |
NETZSCH Measurement
| Instrument | DSC 204 F1 Phoenix® |
| Sample Mass | 11.29 mg |
| Isothermal Phase | 3 min |
| Heating/Colling Rates | 10 K/min |
| Crucible | Al, pierced lid |
| Atmosphere | N2 (40 ml/min) |
Evaluation
Polyamides can absorb humidity. This aff ects the position of the glass transition due to the plasticizing properties of water. In the measuring curves shown above, a small peak can be seen in the 1st heating (blue) at 82°C, probably due to the evapo- ration of water. As a result, the glass transition temperature increases from 51°C in the 1st heating (blue, midpoint) to 53°C in the 2nd heating (red, again midpoint). Endothermal melting of the semi-crystalline polymer occurs at 184°C (peak temperature) in the 2nd heating with a melting enthalpy of 52 J/g.