Journal of Materials Research

Table of Contents - 28 July 2012 - Volume  27   

Articles

Adhesion between a suspended polymeric film and a metallic substrate: Experiments and models

Jing Dua1, Emily Hamppa1, Wanliang Shana2, Hannah Lia3, George Papandreoua3, Cynthia A. Maryanoffa3 and Winston O. Soboyejoa4 c1

a1 Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544; and The Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544

a2 Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544; and The Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544; and Cordis Corporation, a Johnson & Johnson Company, Spring House, Pennsylvania 19477

a3 Cordis Corporation, a Johnson & Johnson Company, Spring House, Pennsylvania 19477

a4 Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey, 08544; and The Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544; and Department of Materials Science and Engineering, The African University of Science and Technology, Abuja, Federal Capital Territory, Nigeria

Abstract

This paper presents the results of a combined experimental, theoretical, and computational study of the adhesion between suspended polymeric films and a substrate in a model drug-eluting stent. Atomic force microscope is used to measure the pull-off force between the polymer and the substrate. The adhesion energy was then obtained from the measured pull-off forces and adhesion theories. Subsequently, the adhesion energy was incorporated into interfacial fracture mechanics zone model that was used to determine mode mixity dependence of the interfacial fracture toughness. The mode mixity-dependent fracture toughness conditions were then integrated into finite element models that were used to compute the critical push-out force of the suspended polymeric films. The predicted push-out forces were in good agreement with the results obtained from the experiments.

(Received February 25 2012)

(Accepted May 10 2012)

Correspondence:

c1 Address all correspondence to this author. e-mail: soboyejo@princeton.edu

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