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Redox-Triggered Debonding of Mussel-Inspired Pressure Sensitive Adhesives: Improving Efficiency Through Functional
Tilmann J Neubert1,2, Keven Walter1, Carolin Schröter1
1Department of chemistry, Humboldt-Universität zu Berlin, Unter den Linden 6, 10117, Berlin, Germany.
Angewandte Chemie (International Ed. in English)
|July 29, 2024
Summary
New debondable adhesives offer enhanced recyclability for microelectronics. A biorelated adhesive achieved 99% debonding efficiency, outperforming a fossil-based alternative.
Area of Science:
- Materials Science
- Polymer Chemistry
- Sustainable Technology
Background:
- Pressure-sensitive adhesives (PSAs) are crucial in microelectronics but hinder recyclability.
- Developing debondable adhesives is key for a circular economy in electronics.
- Thiol-catechol-connectivities (TCC) offer a pathway to reversible adhesive bonding.
Purpose of the Study:
- To synthesize and evaluate two novel debondable PSAs based on TCC.
- To compare the debonding efficiency of a biorelated (BY*Q) and a fossil-based (BQA) PSA.
- To understand how chemical structure influences debonding performance.
Main Methods:
- Synthesis of two tetravalent star-polyester PSAs with TCC linkages.
- Incorporation of either DiDopa-bisquinone (BY*Q) or bisquinone A (BQA).
- Assessment of debonding efficiency via shear strength measurements after oxidation.
Main Results:
- The BY*Q-TCC-PSA demonstrated exceptional debonding, losing 99% of its shear strength.
- The BQA-TCC-PSA showed lower debonding efficiency (approx. 60%), though its initial strength was tunable up to 7 MPa.
- BY*Q-TCC-PSA debonding was attributed to the loss of synergistic interactions, preserving bulk properties.
Conclusions:
- Debondable PSAs based on TCC are viable for microelectronic recyclability.
- The biorelated BY*Q-TCC-PSA significantly outperforms the fossil-based BQA-TCC-PSA in debonding efficiency.
- Tailoring TCC-motif chemistry is critical for optimizing debondable adhesive performance.
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