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Direct measurement of plowing friction and wear of a polymer thin film using the atomic force microscope

Published online by Cambridge University Press:  31 January 2011

Binyang Du ,
Mark R. VanLandingham ,
Qingling Zhang  and
Tianbai He
Binyang Du
Affiliation:
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, People's Republic of China
Mark R. VanLandingham
Affiliation:
Building and Fire Research Laboratory, National Institute of Standards and Technology, 100 Bureau Dr. Stop 8621, Gaithersburg, Maryland 20899-8621
Qingling Zhang
Affiliation:
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, People's Republic of China
Tianbai He*
Affiliation:
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, People's Republic of China
*
a)Address all correspondence to this author. e-mial address: tbhe@ns.ciac.jl.cn
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Abstract

Nanometer-scale plowing friction and wear of a polycarbonate thin film were directly measured using an atomic force microscope (AFM) with nanoscratching capabilities. During the nanoscratch tests, lateral forces caused discrepancies between the maximum forces for the initial loading prior to the scratch and the unloading after the scratch. In the case of a nanoscratch test performed parallel to the cantilever probe axis, the plowing friction added another component to the moment acting at the cantilevered end compared to the case of nanoindentation, resulting in an increased deflection of the cantilever. Using free-body diagrams for the cases of nanoindentation and nanoscratch testing, the AFM force curves were analyzed to determine the plowing friction during nanoscratch testing. From the results of this analysis, the plowing friction was found to be proportional to the applied contact force, and the coefficient of plowing friction was measured to be 0.56 ± 0.02. Also, by the combination of nanoscratch and nanoindentation testing, the energetic wear rate of the polycarbonate thin film was measured to be 0.94 ± 0.05 mm3/(N m).

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 5 , May 2001 , pp. 1487 - 1492
Copyright
Copyright © Materials Research Society 2001

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