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Differential scanning calorimetry
 

Differential scanning calorimetry

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  • Power compensated DSC and heat flux DSC provide the same information but are fundamentally different.
  • Ag heating block dissipates heat to the sample and reference via the constantan disc.
  • organic compounds have been recommended as standards when studying organic material to minimize differences in thermal conductivity, heat capacity, and heat of fusion and may be used predominantly at temperatures below 300 K. Standard procedures can be obtained from the American Society for Testing of Materials (ASTM).
  • Because DSC measures the difference in heat flow between a sample and reference, the baseline stabilizes faster if the difference in heat capacity between the sample and reference is kept small by adding weight (same material as pan) to the reference pan so that it is similar in total weight to the sample pan. Aluminum pans can be used in most experiments, unless the sample reacts with aluminum or the temperature is to exceed 600 ° C. Purity determination 1-3 mg; melting 5-10 mg; Tg or weak transitions up to 20 mg; highly endo/exothermic responses less than 5 mg

Differential scanning calorimetry Differential scanning calorimetry Presentation Transcript