Glass transition

In the laboratory the glass transition is not a sharp transition; its properties change smoothly across $T_{g}$.

• $T_{g}$ increases with a decrease in the observation time, $\tau _{\rm {obs}}$.
• $\Delta H=0$
• $\Delta V=0$

Ideal glass transition temperature

See Ref 1.

Observation time

$\tau _{\rm {obs}}$

See also

• Kauzmann's paradox

References

1. C. A. Angell and J. C. Tucker "Heat capacities and fusion entropies of the tetrahydrates of calcium nitrate, cadmium nitrate, and magnesium acetate. Concordance of calorimetric and relaxational ideal glass transition temperatures", Journal of Physical Chemistry 78 pp. 278 - 281 (1974)
2. Jeppe C. Dyre "The glass transition and elastic models of glass-forming liquids", Reviews of Modern Physics 78 953 (2006)
3. Prabhat K. Gupta and John C. Mauro "The laboratory glass transition", Journal of Chemical Physics 126 224504 (2007)
4. Vassiliy Lubchenko and ­Peter G. Wolynes "Theory of Structural Glasses and Supercooled Liquids", Annual Review of Physical Chemistry 58 pp. 235-266 (2007)
5. C. Patrick Royall1, Stephen R. Williams, Takehiro Ohtsuka and Hajime Tanaka "Direct observation of a local structural mechanism for dynamic arrest", Nature Materials (online) (2008)