DSC/thermal analysis: determination of glass transission temperature

In the glass transition temperature range, there is a sudden change in the heat capacity cp, which is usually accompanied by a sudden change in the physical and technological properties. For example, some polymers suddenly become hard and fragile below the glass transition temperature (e.g. PP), while others can be thermoformed very well when the glass transition temperature is exceeded (e.g. PET). Measurement by DSC is smart, but not feasible on all polymers. We would be happy to advise you.

In short — AI-generated

The glass transition temperature (Tg) is determined using Differential Scanning Calorimetry (DSC) by measuring the heat flow as the material is heated or cooled. This test identifies the specific temperature range where the polymer undergoes a characteristic change in heat capacity, indicating a transition from a rigid, glassy state to a more flexible, rubbery state.

The resulting Tg value indicates the temperature threshold at which a material's physical properties, such as stiffness or brittleness, change significantly. In practice, this information is essential for determining the suitability of a plastic for specific applications, such as thermoforming processes or ensuring structural integrity under varying temperature conditions.

Text is AI-generated; based on test method data curated and verified by Innoform.

Test Method Group: Material analysis

Norms:

ISO 11357-2 (2020-03) Plastics — Differential scanning calorimetry (DSC) — Part 2: Determination of glass transition temperature and step height

Required Sample Amount: 100 mg

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