# ASTM E1640-13 Method for Assignment of the Glass Transition Temperature by Dynamic Mechanical Analysis

ASTM E1640-13 test method calculates the glass transition region and temperature of amorphous and semi-crystalline materials by performing Dynamic Mechanical Analysis. Dynamic mechanical analysers monitor changes in the viscoelastic properties of the material as a function of temperature and frequency, providing a means to quantify changes.

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Scope:

ASTM E1640-13 test method determines the assignment of a glass transition temperature (Tg) of materials which are thermally stable in the glass transition region using dynamic mechanical analysers. The materials have an elastic modulus in the range of 0.5 MPa to 100 GPa is preferred.

Test Procedure:

In ASTM E1640-13, a specimen of known geometry is placed in mechanical oscillation at either fixed or resonant frequency and changes in the viscoelastic response of the material are monitored as a function of temperature. Under ideal conditions, during heating, the glass transition region is marked by a rapid decrease in the storage modulus and a rapid increase in the loss modulus and tangent delta. The glass transition of the test specimen is indicated by the extrapolated onset of the decrease in storage modulus which marks the transition from a glassy to a rubbery solid.

Test Specimen:

Samples may be any uniform size or shape, but are ordinarily analysed in rectangular form. The specimens measuring between 1 × 5 × 20 mm and 1 × 10 × 50 mm are suitable.

Data:

Calculate the glass transition temperature using equation:-

Where:

k = Predetermined Frequency Shift Factor

F = Frequency of Measurement (Hz)

T = Glass Transition Temperature Observed at Frequency F (K)

T1‘ = First Approximation for the Glass Transition Temperature at 1 Hz (K)

T1 = Glass Transition Temperature at 1 Hz (K)

Conclusion:

ASTM E1640-13 provides details about test method for measurement of the Glass Transition Temperature by Dynamic Mechanical Analysis.

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