General Properties
Short Name:
Name:
PE-LLD
Polyethylene Linear Low Density
Linear low density polyethylen (PE-LLD) is different from conventional low-density polyethylene (PE-LD, see previous page) in that it shows only short branching and significantly different rheological properties. PE-LLD is a copolymer with usually butylene, hexene or octene and is produced at lower temperatures and pressures than PE-LD.
Structural Formula
Properties
| Glass Transition Temperature | -130 to -100 / -70 to -25°C |
|---|---|
| Melting Temperature | 122 to 127°C |
| Melting Enthalpy | - |
| Decomposition Temperature | 475 to 485°C |
| Young's Modulus | 250 to 700 MPa |
| Coefficient of Linear Thermal Expansion | 200 *10-6/K |
| Specific Heat Capacity | - |
| Thermal Conductivity | - |
| Density | 0.91 to 0.94 g/cm³ |
| Morphology | Semi-crystalline thermoplastic |
| General properties | Balanced relationship of toughness and stiffness, good chemical resistance, good electrical insulating properties. |
| Processing | Extrusion (films, profiles), injection moulding, blow moulding, extrusion-coating. |
| Applications | Films (allows for lower film thickness than PE-LD), mainly in household and agriculture, packaging (e.g. containers and plastic bags), toys. |
NETZSCH Measurement
| Instrument | DSC 204 F1 Phoenix® |
| Sample Mass | 11.95 mg |
| Isothermal Phases | 20 min/2 min/20 min |
| Heating/Colling Rates | 10 K/min |
| Crucible | Al, pierced lid |
| Atmosphere | N2 (40 ml/min) |
Evaluation
The 1st heating (blue) exhibits a highly structured melting EndothermEin Phasenübergang oder eine Reaktion ist endotherm, wenn für die Umwandlung Wärme benötigt wird.endotherm with a main peak (at 119°C) and several upstream and downstream shoulders, reflecting the presence of stresses (thermomechanical history). In the 2nd heating (red), two peaks at approx. 112°C and 124°C remained. Due to side chain branching, different melting phases are formed which melt one after the other. The corresponding melting enthalpy in the 2nd heating amounts to approx. 137 J/g. Since PE-LLD is a semi-crystalline thermoplastic, the glass transition observed at -35°C (for both heatings) can be related to the amorphous component of the polymer. A second possible glass transition at approx. -100°C to -130°C, which could be due to the different crystallite structures, is not viewable in the plots shown.