PA66, Different Qualities

Sample

Ultramid C3ZM6 (pellets),

Bergamid A70B30 (molded part) and

Ultramid A3K (molded part)

Conditions

Measuring cell: DSC20 (Ultramid C3ZM6 and Bergamid A70B30),

                          DSC821^e (Ultramid A3K)

Pan: Aluminum standard 40 μl, pierced lid

Sample preparation: Disk cut from center part of pellet/molded part

DSC measurement: Heating from 50 to 300 °C at 10 K/min

Atmosphere: Nitrogen, 50 cm3/min

Note: If recrystallization occurs, the baseline for integration must be set before this exothermic peak. The heat of fusion then corresponds to the crystallinity without recrystallization, i.e. to the material as delivered, since the heat of crystallization is equal to the heat of fusion of the same amount of material. 

Interpretation

The DSC peak temperature depends on the size of the crystallites. The latter is controlled primarily by the regularity of polymer molecule. The conditions of crystallization and the degree of polymerization, however, also have an effect. For example, for PE, the peak temperatures ranges from about 110 to 150 °C

Conclusion

Even with the PA66 family, different types of material can be distinguished through their melting range, premelting peaks and the heat of fusion. 

_{PA66, Different Qualities |Thermal Analysis Handbook No.HB228 | Application published in METTLER TOLEDO TA Application Handbook Thermoplastics}