Surface Energy and Adhesion Studies on Acrylic Pressure Sensitive Adhesives |
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| Authors: | Lihua Li Matthew Tirrell Gary A. Korba Alphonsus V. Pocius |
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| Affiliation: |
a Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota, USA
b Applied Materials, Santa Clara, California, USA
c Departments of Chemical Engineering and of Materials, Materials Research Laboratory, University of California Santa Barbara, Santa Barbara, California, USA
d Adhesive Technologies Center, 3 M Company, St. Paul, Minnesota, USA |
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| Abstract: | The surface energy and adhesion dynamics of pressure sensitive adhesives-like networks (PSA-LNs) as mimics for PSAs were studied using JKR-based contact mechanics and peel tests. Acrylic acid (AA) was co-polymerized with 2-ethyl hexyl acrylate (2-EHA) and 1,6-hexane diol diacrylate (HDDA) to create PSA-LNs. The measured surface energy (27 to 31 mJ/m2) was sensible as surmised from their structure. Acrylic acid content increases the surface energy, threshold adhesion energy and adhesion hysteresis of PSA-LNs. Measurements of adhesion dynamics showed a dependence of adhesion energy to the 0.6-0.8 power of crack speed, depending upon the model chosen for analysis of the data. When compared with actual pressure-sensitive adhesive tape peel tests, the adhesion dynamics data predicted the peel strength. This study shows a direct relationship between threshold adhesion energy, crack propagation mechanics and peel strength measurements. |
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| Keywords: | Surface energy Threshold adherence energy Pressure sensitive adhesives Peel adhesion |
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