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RheoTack—An approach to investigate retraction rate dependent detaching behavior of pressure sensitive adhesives

  • Characterization methods of pressure sensitive adhesives (PSA) originate from technical bonding and do not cover relevant data for the development and quality assurance of medical applications, where PSA with flexible backing layers are adopted to human skin. In this study, a new method called RheoTack is developed to determine (mechanically and optically) an adhesion and detaching behavior of flexible and transparent PSA based patches. Transdermal therapeutic systems (TTS) consisting of silicone-based PSAs on a flexible and transparent backing layer were tested on a rotational rheometer with an 8 mm plate as a probe rod at retraction speeds of 0.01, 0.1, and 1 mm/s with respect to their adhesion and detaching behavior in terms of force-retraction displacement curves. The curves consist of a compression phase to affirm wetting; a tensile deformation phase intercepting stretching, cavity, and fibril formation; and a failure phase with detaching. Their analysis provides values for stiffness, force, and displacement of the beginning of fibril formation, force and displacement of the beginning of a failure due to fibril breakage and detaching, as well as corresponding activation energies. All these parameters exhibit the pronounced dependency on the retraction speed. The force-retraction displacement curves together with the simultaneous video recordings of the TTS deformation from three different angles (three cameras) provide deeper insight into the deformation processes and allow for interpreting the properties’ characteristics for PSA applications.

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Document Type:Article
Author:Michael Meurer, Tim Prescher, Esther Ramakers-van Dorp, Bernhard Möginger, Berenika Hausnerova
Parent Title (English):Journal of Rheology
Number of pages:10
First Page:505
Last Page:514
Publisher:AIP Publishing
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2022/03/21
Copyright:© 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license.
Funding:This study was supported by the German Ministry of Education and Research (Grant No. 03FH039PX5). B.H. acknowledges the Ministry of Education, Youth and Sports of the Czech Republic - DKRVO (No. RP/CPS/2022/003). M.M. also acknowledges the Graduate Institute Bonn-Rhein-Sieg University of Applied Sciences for supporting this work by granting a scholarship.
The datasets generated during and/or analyzed during the current study are available in the Zenodo open repository maintained by https://doi.org/10.5281/zenodo.5603015.
Keyword:RheoTack analysis; deformation behavior; detaching; pressure sensitive adhesives; retraction speed dependency
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Institut für Technik, Ressourcenschonung und Energieeffizienz (TREE)
Projects:MOTTSAL - FHprofUnt 2015: Modellierung und Optimierung Transdermaler Therapeutischer Systeme hinsichtlich Applikationskomfort und medizinischer Leistungsfähigkeit (DE/BMBF/13FH039PX5)
Dewey Decimal Classification (DDC):5 Naturwissenschaften und Mathematik / 53 Physik / 531 Klassische Mechanik; Festkörpermechanik
Entry in this database:2022/03/30
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International