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Fragility of Polymeric Liquids: Correlations between Thermodynamic and Dynamic Properties

Published online by Cambridge University Press:  10 February 2011

Dina M. Colucci  and
Gregory B. McKenna
Dina M. Colucci
Affiliation:
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
Gregory B. McKenna
Affiliation:
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
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Abstract

The effect of polymer structure on fragility was determined by relating the apparent fragility to the relaxation response, heat capacity, and thermal expansion. For the 14 polymers studied, the fragility estimates based on the relaxation behavior (log aT) correlated well with the thermodynamic estimates of ΔCp/Mo, and Δα. In general, polymers with less sterically hindered repeat unit structures exhibited strong behavior. Polymers with sterically hindered backbones containing oxygen or ringed structures in the backbone were consistently fragile using log aT, ΔCp/Mo, and Δα as measures of fragility. On the other hand, using Cp1/Cpg as a fragility criterion resulted in very different fragility classifications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 455: Symposium T – Glasses and Glass Formers–Current Issues , 1996 , 171
Copyright
Copyright © Materials Research Society 1997

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References

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