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Title: Voltage-activated adhesion through donor – acceptor dendrimers
Authors: Gan, Lu
Tan, Nigel Chew Shun
Shah, Ankur Harish
Webster, Richard David
Gan, Sher Li
Steele, Terry W. J.
Keywords: Engineering::Materials
Issue Date: 2018
Source: Gan, L., Tan, N. C. S., Shah, A. H., Webster, R. D., Gan, S. L., & Steele, T. W. J. (2018). Voltage-activated adhesion through donor – acceptor dendrimers. Macromolecules, 51(17), 6661-6672. doi:10.1021/acs.macromol.8b01000
Journal: Macromolecules
Abstract: Previous investigations on voltage-activated adhesives were restricted to aqueous solvents, where current-directed cross-linking competed with water electrolysis. Replacing aqueous would expand applications of electrocuring technology and avoid excessive foaming, but many organic solvents have high ohmic resistances that prevent electrical conduction. These impediments were overcome through internal grafting of ferrocene (Fc) and diazirine (Dz) donor–acceptor pairs on fifth-generation polyamidoamine (G5-PAMAM) dendrimers, forming G5-Fc-Dz cografted conjugates, where Fc internal additives provided an instantaneous conductive hole (+) network toward the redox conversion of diazirine to carbene insertion adhesion in nontoxic organic solvents of DMSO, DMF, and PEG400. Size exclusion chromatography, 1H NMR, and 19F NMR evaluated the formulations before and after electrocuring to quantitate grafting ratios and cross-linked dendrimers. Cyclic voltammetry confirmed the retained redox behavior of grafted Fc and Dz. Real-time electrorheology established the dependence of cross-linking kinetics and adhesion strength on applied voltage. Liquid G5-Fc15-Dz30 conjugates reached gelation within 2 min and with a storage modulus up to 3.4 ± 0.5 kPa. For the first time, a model system demonstrates the design components necessary toward organic, voltage-activated one-pot adhesives. This has broad implications for adhesives, cosmetics, implantable biomaterials, and flexible biosensors.
ISSN: 0024-9297
DOI: 10.1021/acs.macromol.8b01000
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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