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

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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.

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Authors and Affiliations

  1. Polymer Science and Engineering, The University of Massachusetts at Amherst, 701 Graduate Research Tower, 01003, Amherst, MA, USA

    David C. Martin & Edwin L. Thomas

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  1. David C. Martin
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  2. Edwin L. Thomas
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Martin, D.C., Thomas, E.L. Direct Imaging of Compressive Failure Zones in Rigid-Rod Polymer Fibers. MRS Online Proceedings Library 134, 465–474 (1988). https://doi.org/10.1557/PROC-134-465

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  • DOI: https://doi.org/10.1557/PROC-134-465

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