Magnetically activated adhesives: towards on-demand magnetic triggering of selected polymerisation reactions. Issue 11 (3rd October 2017)

• Record Type: Journal Article
• Authors: Davies, Gemma-Louise; Govan, Joseph; Tekoriute, Renata; Serrano-García, Raquel; Nolan, Hugo; Farrell, David; Hajatpour, Ory; Gun'ko, Yurii K.
• Is Part Of: Chemical science. Volume 8:Issue 11(2017)
• Page Start: 7758
• Page End: 7764
• Publication Date: 2017-10-03
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7sc03474a
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : We demonstrate a new strategy to inhibit and trigger polymerisation of an adhesive formulation, utilising colloidal core@shell CoFe2 O4 @MnO2 magnetic nanoparticles. Abstract : On-demand initiation of chemical reactions is becoming increasingly popular in many areas. The use of a magnetic field to trigger reactions is an intriguing concept, with vast potential in both research and industrial settings, though it remains a challenge as yet unsolved. Here we report the first example of on-demand magnetic activation of a polymerisation process using an anaerobic adhesive formulation as an example of this new approach toward triggering polymerisation reactions using an external magnetic field. Our strategy involves the use of a colloidal system comprising functional methacrylate ester monomers, peroxide and Cu II -salt as polymerisation initiators and magnetic nanoparticles coated with an oxidising shell. This unique combination prevents reduction of the reactive transition metal (Cu II ) ion by the metal substrates (steel or aluminium) to be joined – hence inhibiting the redox radical initiated cationic polymerisation reaction and efficiently preventing adhesion. The polymerisation and corresponding adhesion process can be triggered by removal of the functional magnetic particles using a permanent external magnet either prior to formulation application or at the joint to be adhered, enabling the polymerisation to proceed through Cu II -mediated reduction. This new approach enables on-demand magnetically-triggered reaction initiation and holds potential for a range of useful applications in chemistry, materials science and relevant industrial manufacturing.