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Redox Responsive Release of Hydrophobic Self-Healing Agents from Polyaniline Capsules

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journal contribution
posted on 16.12.2015, 23:35 by Li-Ping Lv, Yi Zhao, Nicole Vilbrandt, Markus Gallei, Ashokanand Vimalanandan, Michael Rohwerder, Katharina Landfester, Daniel Crespy
Redox-responsive nanocapsules consisting of conductive polyaniline and polypyrrole shells were successfully synthesized by using the interface of miniemulsion droplets as a template for oxidative polymerizations. The redox properties of the capsules were investigated by optical spectroscopies, electron microscopy, and cyclic voltammetry. Self-healing (SH) chemicals such as diglycidyl ether or dicarboxylic acid terminated polydimethylsiloxane (PDMS-DE or PDMS-DC) were encapsulated into the nanocapsules during the miniemulsion process and their redox-responsive release was monitored by 1H NMR spectroscopy. The polyaniline capsules exhibited delayed release under oxidation and rapid release under reduction, which make them promising candidates for anticorrosion applications.