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A Positron-Annihilation-Lifetime study of Polymer Blends

Published online by Cambridge University Press:  15 February 2011

J. Liu ,
Y. C. Jean  and
H. Yang
J. Liu
Affiliation:
Department of Chemistry, University of Missouri-Kansas City, Kansas City, MO 64110
Y. C. Jean
Affiliation:
Department of Chemistry, University of Missouri-Kansas City, Kansas City, MO 64110
H. Yang
Affiliation:
Eastman Chemical Co. Kingsport, TN 37662–5001
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Abstract

Positron-annihilation-lifetime (PAL) spectroscopy has been utilized to investigate the free-volume properties of two types of polymer blends, a miscible blend of bisphenol-A polycarbonate (PC) and tetramethyl bisphenol-A polycarbonate (TMPC), and an immiscible blend of PC and polystyrene (PS). In the miscible blend, the free-volume hole size and its fraction follow a linear relationship with respect to the weight fraction while in the immiscible blend, the relationship is not linearly additive. The free-volume hole distributions in the immiscible blend are found to be significantly broader than those in the pure polymers. The difference is thought to be a result of the free volume formed and associated with the conformation and interchain packing between the dissimilar chains in incompatible polymers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 47
Copyright
Copyright © Materials Research Society 1994

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References

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