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Molecular and Textural Ordering of Thermotropic Polymers in Shear Flow

Published online by Cambridge University Press:  10 February 2011

A Romo-Uribe ,
P. T. Mathers ,
K. P. Chaffee  and
C.D Han
A Romo-Uribe
Affiliation:
Phillips Laboratory, Propulsion Directorate, Edwards Air Force Base, CA 93524–7680 Chemistry Department, University of Southern California, Los Angeles, CA 90089–1062
P. T. Mathers*
Affiliation:
Phillips Laboratory, Propulsion Directorate, Edwards Air Force Base, CA 93524–7680
K. P. Chaffee
Affiliation:
Phillips Laboratory, Propulsion Directorate, Edwards Air Force Base, CA 93524–7680
C.D Han
Affiliation:
Department of Polymer Engineering, The University ofAkron, Akron OH 44325–0301
*
†Author for correspondence
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Abstract

The texture and microstructural order present in mesomorphic polymers and their relation to their macroscopic behavior has been investigated using rheological, optical and dynamic scattering (WAXS and SALS) experiments. Shear orientation is observed under constant rate-of-deformation conditions where this orientation is always parallel to the flow direction. However, the high degree of orientation suggested by optical and SALS measurements is not reflected in the degree of molecular order observed in WAXS experiments. After cessation of flow, a rapid relaxation of stress is observed, while only little microstructural relaxation is found; i.e., the state of orientation is very stable

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 461: Symposia BB – Morphological Control in Multiphase Polymer Mix… , 1996 , 63
Copyright
Copyright © Materials Research Society 1997

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References

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