Glass transition: Difference between revisions
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In the laboratory the '''glass transition''' is not a sharp transition; its properties change smoothly across <math>T_g</math>. | In the laboratory the '''glass transition''' is not a sharp transition; its properties change smoothly across <math>T_g</math>. | ||
*<math>T_g</math> ''increases'' with a decrease in the observation time, <math>\tau_{\rm obs}</math>. | *<math>T_g</math> ''increases'' with a decrease in the observation time, <math>\tau_{\rm obs}</math>. | ||
Revision as of 14:30, 27 September 2007
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In the laboratory the glass transition is not a sharp transition; its properties change smoothly across Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle T_g} .
- Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle T_g} increases with a decrease in the observation time, Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \tau_{\rm obs}} .
- Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \Delta H =0}
- Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \Delta V =0}
Ideal glass transition temperature
See Ref 1.
Observation time
Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \tau_{\rm obs}}
Intrinsic average structural relaxation time
See also
References
- 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)
- Prabhat K. Gupta and John C. Mauro "The laboratory glass transition", Journal of Chemical Physics 126 224504 (2007)