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THERMOGRAVIMETRIC ANALYSIS

 

TA Instruments Q5000
DuPont 951

In a thermogravimetric analysis (TGA) the mass of a sample is continuously monitored in a controlled atmosphere as a function of temperature or time.  TGA in an inert atmosphere (N2, Ar of He) can be considered as a thermal degradation process while an oxidative atmosphere (O2, air) induces thermo-oxidative degradation.  A switch in atmosphere is also possible during the temperature program.  The temperature range is between RT-1200°C(Q5000) and RT-1150°C (951).  Heating rates can be selected between 0.01°C/min and 200°C /min (linear heating, Q5000).  Flash heating is also possible (1000-2000°C/min). The DTG curves allows to determine the transition temperatures.

Typical applications

  • Study of the thermal and thermo-oxidative stability of polymers and materials.
  • Study of oxidative reactions.
  • Determination of the qualitative analysis of rubbers and plastics (additives, elastomer/plastic, carbon black, filler).
  • Study of physical processes as vaporization, sublimation, desorption.
  • Simulation of thermal processes (drying cycle, processing of polymers during thermo formation).
  • Determination of carbon black content in materials.
  • Study of mass losses during sintering processes.

High resolution TGA
TA Instruments High Res TGA 2950

High resolution TGA to obtain enhanced resolution in thermograms as the result of non-linear heating (0.01°C°C /min and 200°C/min) under a controlled atmosphere within a certain temperature range (RT-1000°C).  This feature can be used for the determination of residual film formation after evaporation of the solvent.  Another application is the enhanced resolution of the release of hydrate molecules in a narrow temperature range or solvent evaporation during film formation.