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Synthesis and Dilute Solution Characterization of Extended Chain Poly(Benzazoles)

Published online by Cambridge University Press:  26 February 2011

Andrea W. Chow ,
Steven P. Bitler ,
Paul E. Penwell  and
James F. Wolfe
Andrea W. Chow
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
Steven P. Bitler
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
Paul E. Penwell
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
James F. Wolfe
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
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Abstract

This paper reports the synthesis method for polymerizaing poly(2,6-benzothiazole) (ABPBT) and poly(2,5-benzoxazole) (ABPBO), and their dilute solution properties using low angle light scattering and viscometry. Our data indicate that the Mark-Houwink-Sakurada exponents for these extended-chain polymers are near unity, suggesting a semi-rigid conformation in dilute solutions. The solution properties agree well with the Yamakawa-Fujii worm-like chain model when persistence lengths of 130 Å and 90 Å are assumed for ABPBT and ABPBO, respectively. These values of persistence length are also in good agreement with those predicted by Flory's virtual bond model using information on the molecular geometries taken from x-ray crystallographic data on oriented fibers of ABPBT and ABPBO.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 134: Symposium J – Materials Science and Engineering of Rigid-Rod Polymers , 1988 , 173
Copyright
Copyright © Materials Research Society 1989

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References

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