Glass transition temperature

Below solidifying or glass transition temperature (also referred to as “glass temperature”), the polymers not organised in the crystal lattice and polymer segments of a semi-crystalline plastic lose their ability to move. As a result, the properties of the plastic significantly change when the glass exceeds its transition temperature or falls below it.

  • Hardness:
    Below the glass transition temperature, the hardness increases significantly
  • Elongation:
    Below glass transition temperature, plastics loose their elastomer properties and become hard and brittle
  • Volume
  • Surface energy:
    And thus also the contact angle. The glass transition temperature of thermoplastics can be very easily determined by measuring the contact angle as a function of temperature.

The "solidifying" temperature has nothing to do with the melting temperature. The thermoplastic is solid below and above the solidifying temperature.

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