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Work of adhesion/separation between soft elastomers of different mixing ratios

Published online by Cambridge University Press:  17 August 2015

Yalin Yu ,
Daniel Sanchez  and
Nanshu Lu
Yalin Yu
Affiliation:
Center for Mechanics of Solids, Structures and Materials, Department of Aerospace Engineering and Engineering Mechanics, Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA
Daniel Sanchez
Affiliation:
Center for Mechanics of Solids, Structures and Materials, Department of Aerospace Engineering and Engineering Mechanics, Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA
Nanshu Lu*
Affiliation:
Center for Mechanics of Solids, Structures and Materials, Department of Aerospace Engineering and Engineering Mechanics, Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA
*
a) Address all correspondence to this author. e-mail: nanshulu@utexas.edu
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Abstract

Adhesion between soft matter is a universal mechanical problem in bio-engineering and bio-integration. The Johnson–Kendall–Roberts (JKR) method is widely used to measure the work of adhesion and work of separation between soft materials. In this study, the JKR theory is recaptured and three complementary dimensionless parameters are summarized to help design adhesion measurement experiments compatible with the JKR theory. The work of adhesion/separation between two commonly used soft elastomers, polydimethylsiloxane (PDMS, Sylgard® 184) and Ecoflex® 0300, is measured by the JKR method using a dynamical mechanical analyzer. Effects of base polymer to curing agent mixing ratio and solvent extraction are examined. A unified adhesion mechanism is proposed to explain the different adhesion behaviors. It is concluded that chain–matrix interaction is the most effective adhesion mechanism compared with chain–chain or matrix–matrix interactions. Chain–chain interaction obstructs chain–matrix interaction as it either blocks or entangles with surface chains which could have interacted with the matrix.

Keywords

JKR methodPDMSmixing ratioEcoflexDMA

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Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 18 , 28 September 2015 , pp. 2702 - 2712
Copyright
Copyright © Materials Research Society 2015 

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