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Free-Volume Properties of Amorphous Polymers Probed by Positron Annihilation Spectroscopy

Published online by Cambridge University Press:  16 February 2011

Y. C. Jean ,
F. Zandiehnadem  and
Q. Deng
Y. C. Jean
Affiliation:
Department of Chemistry, University of Missouri-Kansas City Kansas City, MO 64110
F. Zandiehnadem
Affiliation:
Department of Chemistry, University of Missouri-Kansas City Kansas City, MO 64110
Q. Deng
Affiliation:
Department of Chemistry, University of Missouri-Kansas City Kansas City, MO 64110
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Abstract

Positron annihilation spectroscopy (PAS) has been developed to characterize the free-volume properties of polymers. Positron annihilation lifetime measurements give direct information about the dimension, content, and hole-size distributions of free-volume in amorphous materials. The angular correlation of positron annihilation radiation measurements give additional information about the shape of the free-volume holes in oriented polymeric materials. The unique capability of PAS to probe free-volume properties is from the fact that positronium atom is preferentially trapped in the atomic-scale holes which have a size ranging from 1 to 10 Å.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 215: Symposium R2 – Structure, Relaxation and Physical Aging of Glassy Polymers , 1990 , 163
Copyright
Copyright © Materials Research Society 1991

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