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Theoretical Studies of the Physical Properties of Rodlike and Related Polymers

Published online by Cambridge University Press:  26 February 2011

W. J. Welsh ,
J. E. Mark ,
Y. Yang  and
G. P. Das
W. J. Welsh
Affiliation:
University of Missouri-St. Louis, Dept. of Chemistry, St. Louis, MO 63121
J. E. Mark
Affiliation:
University of Cincinnati, Dept. of Chemistry, Cincinnati, OH 45211
Y. Yang
Affiliation:
University of Missouri-St. Louis, Dept. of Chemistry, St. Louis, MO 63121
G. P. Das
Affiliation:
University of Cincinnati, Dept. of Chemistry, Cincinnati, OH 45211
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Abstract

This review focuses on a new type of para-catenated aromatic polymer being used in the preparation of high-performance films and fibers of exceptional strength, thermal stability, and environmental resistance, including inertness to essentially all common solvents. Polymers of this type include the cis- and trans-poly(p-phenylene benzobisoxazole) (PBO), the cis- and trans-forms of the corresponding poly(pphenylene benzobisthiazole) (PBT), and the structurally similar poly(5,5ʹ-bibenzoxazole-2.2ʹ-diyl-l,3-phenylene) (AAPBO) and poly(2,5-benzoxazole) (ABPBO) and their sulfurcontaining analogues. Because of their rigidity, these polymers become highly oriented in solution and some display liquid crystalline behavior. The purpose of this paper is to summarize the authorsʹ theoretical work on the structures, conformational energies, intermolecular interactions, electronic properties, electrical conductivity, and electrooptical properties of these chains, including, in some cases, the so-called articulated forms and the protonated forms known to exist in strong acids. The emphasis is on how such studies provide a molecular understanding of the unusual properties and processing characteristics of this new class of materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 134: Symposium J – Materials Science and Engineering of Rigid-Rod Polymers , 1988 , 621
Copyright
Copyright © Materials Research Society 1989

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References

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