PE-LD, Comparison of Two Products

Sample

Lupolen 1800S and Lupolen conz. SL 020 A as pellets

Conditions

Measuring Cell: DSC20

Pan: Aluminum standard 40 ul, pierced lid

Sample preparation: Disks cut from the center part of pellet

DSC measurement: Heating from 30 to 250°C at 10 K/min

Atmosphere: Air, 50 cm³/min

Evaluation

Interpretation

The DSC melting curves have the typical shape for PE-LD. The exothermic reaction above 200°C is due to the onset of oxidation.

Conclusions

Evaluation of the percentage crystallinity and peak temperature reveal that these two samples are of similar quality and that both are PE-LD. The onsets of oxidation around 220°C indicate they are <<processing stabilized>> because the onsets are slightly higher than expected for basic PE. Lupolen 1800 S is more stable than the other sample. Further stabilization could be achieved by adding additional antioxidants. This could shift the onset to as high as 260°C. 

^{PE-LD, Comparison of Two Products |  Thermal Analysis Application No. HB 208 | Application published in METTLER TOLEDO TA Application Handbook Thermoplastics}