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Effect of Crystallinity on the Friction Behavior of Ultra-high-molecular-weight-polyethylene

Published online by Cambridge University Press:  26 February 2011

Kanaga Karuppiah Kanaga Subramanian ,
Angela L Bruck ,
Sriram Sundararajan  and
Zhiqun Lin
Kanaga Karuppiah Kanaga Subramanian
Affiliation:
kskarup@iastate.edu, Iowa State University, Mechanical Engineering, 0087 Black Engineering Building, Mechanical Engineering Department, Iowa State University, Ames, IA, 50011, United States, 515-294-8020, 515-294-3261
Angela L Bruck
Affiliation:
brucka@iastate.edu, Iowa State University, Mechanical Engineering, Ames, IA, 50011, United States
Sriram Sundararajan
Affiliation:
srirams@iastate.edu, Iowa State University, Mechanical Engineering, Ames, IA, 50011, United States
Zhiqun Lin
Affiliation:
zqlin@iastate.edu, Iowa State University, Materials Science & Engineering, Ames, IA, 50011, United States
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Abstract

In this study we evaluate the interfacial shear strength and scratch resistance of medical grade ultra-high molecular weight polyethylene (UHMWPE) (GUR 1050 resin) as a function of polymer crystallinity. Crystallinity was controlled by heating UHMWPE samples to a temperature above its melting point and varying the hold time and cooling rates. Degree of crystallinity of the samples was evaluated using differential scanning calorimetry (DSC). Quantitative nanoscale friction experiments were conducted using an atomic force microscope with commercially available Si3N4 probes under dry conditions. A higher crystallinity resulted in lower friction force and lower interfacial shear strength as well as increased scratch resistance. The trend in friction response was observed in microscale friction measurements.

Keywords

tribologycrystallinenanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 977: Symposium FF – Processing-Structure-Mechanical Property Relations in Composite Materials , 2006 , 977-FF06-04-DD05-04
Copyright
Copyright © Materials Research Society 2007

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