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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

REFERENCES

1. Angell, C.A., in “Relaxations in Complex Systems,” ed. by Ngai, K.L. and Wright, G.B., Workshop Proceedings, Naval Research Laboratory, Washington, D.C., (1984).Google Scholar
2. Williams, M.L., Landel, R.F., and Ferry, J.D., J. Amer. Chem. Soc., 77, 3701, (1955).Google Scholar
3. Ngai, K.L. and Plazek, D.J., “Temperature Dependencies of the Viscoelastic Response of Polymer Systems,” from Physical Properties Handbook, ed. Mark, J. E., American Institute of Physics Press, Woodbury, NY, pg 341, (1996).Google Scholar
4. Wen, J., “Heat Capacities of Polymers,” from Physical Properties Handbook, ed. Mark, J. E., American Institute of Physics Press, Woodbury, NY, pg 101, (1996).Google Scholar
5. Domininghaus, H., Plastics for Engineers: Materials. Properties, and Applications. Hanser Publishers, New York (1993). (value from analysis of PVT data contained in book).Google Scholar
6. Zoller, P., J. Appl. Poly. Sci., 23, 1057, (1979).Google Scholar
7. Quach, A. and Simha, R., J. Appl. Phys., 42, 12, (1971).Google Scholar
8. Zoller, P. and Bolli, P., J. Macromol. Sci. - Phys., B18, 3, 555, (1980).Google Scholar
9. General Electric Database, http://www.ge.com/datasheets/LEXANLS2.html Google Scholar
10. Wilski, H., “Heat Capacities of High Polymers Part A: Experimental Curves, Polymer Handbook. 3rd ed., eds. Brandrup, J. and Immergut, E.H., J. Wiley and Sons, N. Y. C. (1989).Google Scholar
11. Simon, S., University of Pittsburgh, personal communication.Google Scholar
12. Colucci, D.M., PhD Thesis, Purdue University, (1995).Google Scholar