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A Positron Annihilation Lifetime Study of Poly(Bisphenol-a Carbonate)

Published online by Cambridge University Press:  26 February 2011

P. L. Jones ,
A. J. Hill ,
G. W. Pearsall  and
J. H. Lind
P. L. Jones
Affiliation:
Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27706
A. J. Hill
Affiliation:
Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27706
G. W. Pearsall
Affiliation:
Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27706
J. H. Lind
Affiliation:
Dupont Electronic Testing Laboratory, Research Triangle Park, NC 27709
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Abstract

Positron annihilation lifetime spectroscopy has proven to be sensitive to glass transitions and other free volume dependent phase transitions in amorphous and semicrystalline polymers. The thermal dependence of the lifetime spectra of positrons in compression-molded poly(bisphenol-A carbonate) has been measured from 253K to 323K, then modelled using a three component fit. The longest-lived component lifetime τ3 was found to vary linearly with increasing temperature independent of thermal history. The corresponding component intensity I3 was found to vary in a non-linear fashion with increasing temperature, exhibiting a significant dependence on thermal history. The observed thermal response of τ3 and I3 is discussed in terms of both molecular relaxation and the ductile-to-brittle transition behavior of poly(bisphenol-A carbonate).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 82: Symposium I – Characterization of Defects in Materials , 1986 , 29
Copyright
Copyright © Materials Research Society 1987

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References

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