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Sliding wear, viscoelasticity, and brittleness of polymers

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Abstract

We have connected viscoelastic recovery (healing) in sliding wear to free volume in polymers by using pressure-volume-temperature (P-V-T) results and the Hartmann equation of state. A linear relationship was found for all polymers studied with a wide variety of chemical structures, except for polystyrene (PS). Examination of the effect of the indenter force level applied in sliding wear on the healing shows that recovery is practically independent of that level. Strain hardening in sliding wear was observed for all materials except PS, the exception attributed to brittleness. Therefore, we have formulated a quantitative definition of brittleness in terms of elongation at break and storage modulus. Further, we provide a formula relating the brittleness to sliding wear recovery; the formula is obeyed with high accuracy by all materials including PS. High recovery values correspond to low brittleness, and vice versa. Our definition of brittleness can be used as a design criterion for choosing polymers for specific applications.

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Authors and Affiliations

  1. Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science and Engineering, University of North Texas, Denton, Texas, 76203-5310, USA

    Witold Brostow & Haley E. Hagg Lobland

  2. Department of Chemical Engineering, Technion–Israel Institute of Technology, Haifa, 32000, Israel

    Moshe Narkis

  3. Department of Chemical Engineering, Shenkar College of Engineering and Design, Ramat-Gan, 52526, Israel

    Moshe Narkis

Authors
  1. Witold Brostow
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  2. Haley E. Hagg Lobland
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  3. Moshe Narkis
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Correspondence to Witold Brostow.

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Brostow, W., Hagg Lobland, H.E. & Narkis, M. Sliding wear, viscoelasticity, and brittleness of polymers. Journal of Materials Research 21, 2422–2428 (2006). https://doi.org/10.1557/jmr.2006.0300

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  • DOI: https://doi.org/10.1557/jmr.2006.0300

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