The interfacial adhesive behavior between acrylic pressure sensitive adhesive-like networks (PSA-LNs) and poly(vinyl N-alkyl carbamate) release coatings was studied using a contact mechanical method and peel tests. Surface energy and interracial energy were directly measured in JKR tests using a novel sample construction. The surface energy of the poly(vinyl N-alkyl carbamates) was found to be around 20 mJ/m2. Interfacial energies between PSA-LNs and the release coatings were found to be quite high - between 7 and 24 mJ/m2. Changes in adhesion dynamics were governed by acid-base interactions between the carbamate in the release coating and the acid groups in the PSA-LN. The length of the alkyl chain in the release coating moderated this effect. We also found a correlation between fundamental adhesion energy and peel strength. Examination of this phenomenon provides a basis for understanding the poor storage stability of PSA tapes made using alkyl carbamates and acid-containing PSAs.
Bibliographical noteFunding Information:
We gratefully acknowledge the financial support provided by 3M Company and the NSF-MRSEC DMR-9809364 at the University of Minnesota. We thank Dr. D. J. Kinning of 3M for providing the release materials. We also thank Prof. W. W. Gerberich of the University of Minnesota for stimulating discussions.
- Interfacial energy
- Peel adhesion
- Pressure sensitive adhesives
- Release coating