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DSC 204 F1 Phoenix® - Differential Scanning Calorimeter
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Polymers
Polyethylene terephthalate (PET) is a semi-crystalline thermoplastic polymer with a relatively slow crystallization rate. In the DSC experiments, the various levels of amorphousness (Tg 75°C-85°C) and crystallinity (recrystallization 146°C, melting 242°C) are apparent. The samples were cooled from the melt in the DSC 204 F1 Phoenix® with the intracooler at different rates prior to the heating shown.
Polymers
The ability to determine specific heat capacity for the most varied of materials is an important task for the DSC. A mean error of < 2% was attained on NIST Standard Reference Material 705a, a polystyrene with narrow molar mass distribution, by using a heating rate of 10 K/min and various analysis methods.
UV curing
The UV curing of a photo-initiated epoxy resin adhesive by cationic polymerization is also affected by the set temperature. At a constant exposure time of 60s, the higher temperature of 70°C (red curves for DSC and temperature) causes higher reactivity of the resin system (faster curing) as well as a higher heat of reaction (390 J/g). It is particularly important to be familiar with this property when dealing with dual-curing resin systems, both thermal and light-curing.
Metals
When analyzing modern metal alloys, it is important that there be a good separation of the melting peaks for the individual alloy components. The DSC 204 F1 Phoenix® with τ-Sensor yields an excellent peak separation in the melting range from 510°C to 650°C for the aluminum alloy measured here.
Pharmaceuticals
Sorbitol is used as a substitute for sugar in many sweets, diet products, and medications. A proportion of 5.5% water in anhydrous Sorbitol causes the glass transition to defer from -1.7°C to -25.6°C. Both samples remain completely amorphous after the rapid cool-down following the melt (which took place before the heating mentioned above).
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