Abstract
The fragility of glassforming systems, which is correlated strongly to the magnitude of aging effects below T g, is related to the rate per K at which the liquid (or rubber) is approaching its configurational ground state, i.e. the rate at which its excess (non-vibrational) entropy is 'running out'. For simple liquids, it is usually correlated to the increase of C p normalized to the glass value at T g. The most fragile glassformers identified to date have been chain polymer, PVC being the extreme case (for structural reasons which are far from clear). For chain polymers, however, the change of heat capacity at T g relative to the glass value of T g is small, approx.10% compared to approx.80% for fragile molecular liquids. We examine the origin of this difference and discuss its relevance to the vibrational dynamics of amorphous systems.
| Original language | English (US) |
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| Title of host publication | Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Materials Science and Engineering |
| Editors | Anon |
| Publisher | ACS |
| Pages | 208 |
| Number of pages | 1 |
| Volume | 76 |
| State | Published - 1997 |
| Event | Proceedings of the 1997 Spring ACS Meeting - San Francisco, CA, USA Duration: Apr 13 1997 → Apr 17 1997 |
Other
| Other | Proceedings of the 1997 Spring ACS Meeting |
|---|---|
| City | San Francisco, CA, USA |
| Period | 4/13/97 → 4/17/97 |
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Polymers and Plastics