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Direct Imaging of Compressive Failure Zones in Rigid-Rod Polymer Fibers

Published online by Cambridge University Press:  26 February 2011

David C. Martin  and
Edwin L. Thomas
David C. Martin
Affiliation:
Polymer Science and Engineering, 701 Graduate Research TowerThe University of Massachusetts at Amherst, Amherst, MA 01003
Edwin L. Thomas
Affiliation:
Polymer Science and Engineering, 701 Graduate Research TowerThe University of Massachusetts at Amherst, Amherst, MA 01003
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Abstract

Fibers of rigid-rod polymers are comparatively weak in compression with deformation occurring by strain localization into kink bands. Here, we present an ultrastructural study of the deformation processes accompanying kink formation in fibers of poly(paraphenylene benzobisthiazole) (PBZT) and poly(paraphenylene benzobisoxazole) (PBZO). Lateral packing between chains is maintained after shear deformation. The local strain is heterogeneous and has been analyzed in detail. Observation of sharp, high angle tilt boundaries confirms a deformation mechanism which involves kinking of individual polymer chains. A model of the micromechanisms involved in kinking is proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 134: Symposium J – Materials Science and Engineering of Rigid-Rod Polymers , 1988 , 465
Copyright
Copyright © Materials Research Society 1989

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References

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