Volume 66, Number 4, May 2004
|Page(s)||513 - 519|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 May 2004|
Tackiness of pressure-sensitive adhesives: An ultra-small-angle X-ray scattering investigation
Technische Universität München, Physik-Department E13 James-Franck-Strasse 1, D-85747 Garching, Germany
Accepted: 5 March 2004
The debonding of a model pressure-sensitive adhesive (PSA) poly-n-buthylacrylate is investigated by a combination of the mechanical tack test, optical microscopy and in situ ultra-small-angle X-ray scattering. From the mechanical test, macroscopic values such as force-distance curves are determined. The force-distance curve exhibits the typical non-linear behavior. With microscopy the macroscopic cavitation structure is observed. Scattering addresses the structure of the PSA on a microscopic level for the first time. As a new feature, a sub-structure of the usual optically resolvable macroscopic fibrils between the PSA surface and the probe punch is detected. The sub-structure exists over a large distance between the PSA and the probe surface and remains constant in diameter. This behavior of the sub-structure as well as the dependence of the force plateau on the film thickness are compared with theoretical predictions.
PACS: 61.10.Eq – X-ray scattering (including small-angle scattering) / 81.70.Bt – Mechanical testing, impact tests, static and dynamic loads / 68.35.Np – Adhesion
© EDP Sciences, 2004
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