Microindentation and Nanoindentation Studies of Aging in Pressure-Sensitive Adhesives

Adriana Paiva,† Nina Sheller, and Mark D. Foster*
Maurice Morton Institute of Polymer Science, The University of Akron, Akron, Ohio 44325-3909
Alfred J. Crosby and Kenneth R. Shull
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
Macromolecules, 2001, 34 (7), pp 2269–2276
DOI: 10.1021/ma0002343
Publication Date (Web): February 24, 2001
Copyright © 2001 American Chemical Society
†

 Current address:  3M Company, St. Paul, MN.

,
*

 Corresponding author:  phone (330) 972-5323; Fax (330) 972-5290; e-mail foster@polymer.uakron.edu.

Abstract

Microindentation and nanoindentation measurements of model pressure-sensitive adhesives have been used along with scanning probe imaging to follow changes in properties with aging. One blend that is initially miscible stiffens markedly with time for tackifier loadings above a certain value. Lateral phase segregation at the surface is seen for some of the blends along with strong increases in stiffness. Changes with time are less pronounced in the miscible blend with a tackifier stabilized by hydrogenation. While microindentation provides quantitative measurement of changes in overall stiffness and adhesive performance, nanoindentation provides lateral resolution of the changes near the surface. Of the techniques used here, phase detection mode scanning probe imaging provides the most highly surface selective means of noting changes in properties with aging.

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History

  • Published In Issue March 27, 2001
  • Received February 8, 2000
    Revised Manuscript Received January 10, 2001

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