Thermally and base-triggered ‘debond-on-demand’ crosslinked polyurethane adhesives

Tareq, A. Z., Hyder, M., Harries, J. L. ORCID: https://orcid.org/0000-0003-0047-2991 and Hayes, W. ORCID: https://orcid.org/0000-0003-0047-2991 (2025) Thermally and base-triggered ‘debond-on-demand’ crosslinked polyurethane adhesives. Faraday Discussions. ISSN 1364-5498 doi: 10.1039/D5FD00051C

Abstract/Summary

To address current industrial needs and modern legislation, a series of rapidly degradable and strongly adhering crosslinked polyurethanes featuring the commercially available and degradable chain-extender 2,2’-sulfonyldiethanol have been made for use as depolymerisable coatings and ‘debond-on-demand’ hot-melt adhesives. Variation of the chain-extended polyurethane (CEPU) composition, through increased hard segment content, provided a route to tailor the mechanical, adhesive, and degradable characteristics, whereby CEPUs with ultimate tensile strengths and elongation at break of up to 42.68 MPa and 17.59 e, respectively, could be achieved. The adhesive shear strength of the CEPUs was investigated on a selection of substrates with the highest shear strength observed of 7.80 MPa on aluminium. Depolymerization was triggered via exposure of the CEPUs to tetra-butylammonium fluoride (TBAF), causing the solubilisation of the CEPUs and the generation of low molecular weight species. Rapid ‘debond-on-demand’ adhesion was also achieved upon exposure to 1 M TBAF(aq), with losses in shear strength of up to 34% on aluminum when exposed for 30 minutes.

Item Type	Article
URI	https://centaur.reading.ac.uk/id/eprint/123092
Identification Number/DOI	10.1039/D5FD00051C
Refereed	Yes
Divisions	Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Publisher	The Royal Society of Chemistry
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