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Rheology of Blends of a Rodlike Polymer (PBO) and its Flexible Chain Analog

Published online by Cambridge University Press:  21 February 2011

V. J. Sullivan  and
G. C. Berry
V. J. Sullivan
Affiliation:
Carnegie Mellon University, Dept. of Chemistry, 4400 Fifth Avenue, Pittsburgh, PA 15213
G. C. Berry
Affiliation:
Carnegie Mellon University, Dept. of Chemistry, 4400 Fifth Avenue, Pittsburgh, PA 15213
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Abstract

Rheological properties of isotropic solutions of rodlike poly(p-phenylene benzbisoxazole), PBO, flexible chain poly(2,5-benzoxazole), ABPBO, and their miscible blends in solution are described. Measurements include steady state properties (the viscosity and recoverable compliance as functions of shear rate), transient properties (the recoverable compliance), and dynamic mechanical properties (the loss and storage compliances as functions of frequency). The relaxation spectrum of the blends is broader than that for the rodlike chain, and tends to occur at longer times, reflecting a viscosity enhancement that occurs with the blends. The measured zero shear viscosities for rod and blend solutions are compared with predictions based on the model of Doi and Edwards.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 171: Symposium O – Polymer Based Molecular Composites , 1989 , 141
Copyright
Copyright © Materials Research Society 1990

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References

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