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Thermotropic Polyesters Containing Carbonyl Or Ether Linkages

Published online by Cambridge University Press:  15 February 2011

Robert S. Irwin
Robert S. Irwin*
Affiliation:
Pioneering Research Laboratory, Du Pont Fibers and Central Research and Development, E. I. du Pont de Nemours and Co., Inc., Experimental Station, Wilmington, DE 19880–0302
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Abstract

In an assembly of aligned, thermotropic polyester macromolecules, such as a fiber, the flexibility and deviations from rectilinearity occasioned by in-chain ArCOAr or ArOAr units are reflected sensitively by overall stiffness (initial modulus) and elasticity (elongation at break). The influence of frequency and placement of these units, as well as the effect of ring substituents, is discussed.

In a few cases where carbonyl or other units are regularly placed at suitable intervals along the chain, the latter apparently is extended as a low amplitude, regular helix which, in terms of physical properties, approximates to a straight, rod-like conformation. In situations where the angulation created by a carbonyl unit is immediately cancelled by an adjacent m-phenylene ring, the extended macromolecule is virtually rectilinear and, though marginally liquid crystalline, may provide some of the strongest organic fibers known.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 227: Symposium J – Materials Science of High Temperature Polymers for Microelectronics , 1991 , 293
Copyright
Copyright © Materials Research Society 1991

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References

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