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Sliding wear, viscoelasticity, and brittleness of polymers

Published online by Cambridge University Press:  03 March 2011

Witold Brostow ,
Haley E. Hagg Lobland  and
Moshe Narkis
Witold Brostow*
Affiliation:
Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203-5310
Haley E. Hagg Lobland
Affiliation:
Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203-5310
Moshe Narkis
Affiliation:
Department of Chemical Engineering, Technion – Israel Institute of Technology, Haifa 32000, Israel; and Department of Chemical Engineering, Shenkar College of Engineering and Design, Ramat-Gan 52526, Israel
*
a) Address all correspondence to this author. e-mail: brostow@unt.edu
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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.

Keywords

Macromolecular structurePolymerTribology
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 9 , September 2006 , pp. 2422 - 2428
Copyright
Copyright © Materials Research Society 2006

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