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Orientability of Rigid Rodlike Molecules in Solution and Controlled Preparation of Model Systems

Published online by Cambridge University Press:  26 February 2011

Jeffrey A. Odell ,
Andrew Keller ,
Edward D.T. Atkins ,
Miklos J. Nagy ,
Jose Luis Feijoo  and
Goran Ungar
Jeffrey A. Odell
Affiliation:
H.H. Wills Physics Laboratory, University of Bristol, Tyndall Ave., Bristol BS8 lTL., U.K
Andrew Keller
Affiliation:
H.H. Wills Physics Laboratory, University of Bristol, Tyndall Ave., Bristol BS8 lTL., U.K
Edward D.T. Atkins
Affiliation:
H.H. Wills Physics Laboratory, University of Bristol, Tyndall Ave., Bristol BS8 lTL., U.K
Miklos J. Nagy
Affiliation:
H.H. Wills Physics Laboratory, University of Bristol, Tyndall Ave., Bristol BS8 lTL., U.K
Jose Luis Feijoo
Affiliation:
H.H. Wills Physics Laboratory, University of Bristol, Tyndall Ave., Bristol BS8 lTL., U.K
Goran Ungar
Affiliation:
H.H. Wills Physics Laboratory, University of Bristol, Tyndall Ave., Bristol BS8 lTL., U.K
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Abstract

A survey is presented of our works on orientability of poly(p-phenylene-benzbisthiazole) (PBT) as a model for rigid rods. It starts with the solid state with specific reference to diffraction by the individual molecule. It is followed by behaviour in semidilute solutions, demonstrating increase of orientability with increasing rod alignment, with vastly higher absolute values (as expressed by rotational diffusion coefficient) than anticipated from existing theory. The origin of the discrepancy, as identified by simulations, lies in the inappropriateness of the application of mean constraints, a recognition which should have wider implications. The relaxation from the highly oriented state, also in solution, has been followed and the elementary rotational jump of rods identified, with a new method relying on in situ (synchrotron) X-ray diffraction. As a separate line, we are announcing a new model system, ellipsoidal latices of predesigned axial ratios, with wide ranging potential for the study of rigid rod behaviour in polymer and colloid science.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 134: Symposium J – Materials Science and Engineering of Rigid-Rod Polymers , 1988 , 223
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

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