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The Effect of Surface Contamination on Adhesive Forces as Measured by Contact Mechanics

Published online by Cambridge University Press:  01 February 2011

John A. Emerson ,
Rachel K. Giunta ,
Gregory V. Miller ,
Christopher R. Sorensen  and
Raymond A. Pearson
John A. Emerson
Affiliation:
Department of Organic Materials, Sandia National Laboratories, Albuquerque, NM 87185–0958, USA
Rachel K. Giunta
Affiliation:
Department of Organic Materials, Sandia National Laboratories, Albuquerque, NM 87185–0958, USA
Gregory V. Miller
Affiliation:
Department of Organic Materials, Sandia National Laboratories, Albuquerque, NM 87185–0958, USA
Christopher R. Sorensen
Affiliation:
Department of Organic Materials, Sandia National Laboratories, Albuquerque, NM 87185–0958, USA
Raymond A. Pearson
Affiliation:
Materials Science and Engineering Department, Lehigh University, Bethlehem, PA 18015–3195, USA
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Abstract

The contact adhesive forces between two surfaces, one being a soft hemisphere and the other being a hard plate, can readily be determined by applying an external compressive load to mate the two surfaces and subsequently applying a tensile load to peel the surfaces apart. The contact region is assumed the superposition of elastic Hertzian pressure and of the attractive surface forces that act only over the contact area. What are the effects of the degree of surface contamination on adhesive forces? Clean aluminum surfaces were coated with hexadecane as a controlled contaminant. The force required to pull an elastomeric hemisphere from a surface was determined by contact mechanics, via the JKR model, using a model siloxane network for the elastomeric contact sphere. Due to the dispersive nature of the elastomer surface, larger forces were required to pull the sphere from a contaminated surface than a clean aluminum oxide surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 629: Symposium FF – Interfaces, Adhesion and Processing in Polymer Systems , 2000 , FF8.7
Copyright
Copyright © Materials Research Society 2000

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References

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