Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Geometric and Interfacial Effects on Viscoelastic Indentation of Confined Polymer Films



Peter M. Johnson, Christopher M. Stafford


The long-term performance and stability of composites made from renewable feedstocks will be strongly dependent on the inherent viscoelastic relaxation processes of the material. These relaxations are controlled not only by the polymer network structure but also the local dynamics that occur in the bulk and at the interfaces within the material. While various viscoelastic measurement techniques are available for the dynamics of bulk materials, contributions from buried interfaces are harder to probe. Model confined material systems were produced having buried interfaces with controlled chemistries, textures, or structural patterns. These films were then indented using a high-throughput indentation technique to measure viscoelastic responses. While the viscoelastic relaxations of the confined polymer film are equivalent to the bulk viscoelastic response, the local dynamics at the interface alter the stress relaxations underneath the indenter and resulting deformation profile over time. These responses when compared to slip and no-slip adhesion conditions provide a method to measure the relative strength of the interface and a pathway to design better interfaces that limit viscoelastic response and improve material properties.
Conference Dates
February 21-24, 2010
Conference Location
Daytona Beach, FL
Conference Title
33rd Annual Meeting of the Adhesion Society


adhesion, confinement, viscoelastic


Johnson, P. and Stafford, C. (2010), Geometric and Interfacial Effects on Viscoelastic Indentation of Confined Polymer Films, 33rd Annual Meeting of the Adhesion Society, Daytona Beach, FL, [online], (Accessed April 21, 2024)
Created February 21, 2010, Updated February 19, 2017