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Characterization of Thermotropic Liquid Crystalline Polymer Blends by Positron Annihilation Lifetime Spectroscopy

Published online by Cambridge University Press:  15 February 2011

Robert A. Naslund ,
Phillip L. Jones  and
Andrew Crowson
Robert A. Naslund
Affiliation:
Duke University, Department of Mechanical Engineering and Materials Science, Durham, North Carolina 27706
Phillip L. Jones
Affiliation:
Duke University, Department of Mechanical Engineering and Materials Science, Durham, North Carolina 27706
Andrew Crowson
Affiliation:
U.S. Army Research Office, Research Triangle Park, North Carolina 27709-2211
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Abstract

Positron annihilation lifetime spectroscopy (PALS) is used to investigate polymer-based molecular composites of two separate thermotropic liquid crystalline polymers (TLCPs) and the thermoplastic matrix polyetherimide. Trends in PALS spectral components obtained isothermally at 20°C and 120°C as a function of TLCP content are discussed as a function of free volume and molecular structure. Differential scanning calorimetry was employed as a complementary technique to investigate the differences in miscibility of the two systems and possible effects on positron lifetime values.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 274: Symposium R – Submicron Multiphase Materials , 1992 , 53
Copyright
Copyright © Materials Research Society 1992

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References

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