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 (1)H NMR spectroscopy. The polyaniline capsules exhibited delayed release under oxidation and rapid release under reduction, which make them promising candidates for anticorrosion applications.
Redox-responsive polyvinylferrocene-grafted
silica nanoparticles have been used for modulating the catalytic activity
of surface-attached Grubbs second generation type catalysts for the
ring-opening metathesis polymerization (ROMP) of norbornene monomer.
A facile and very efficient protocol for the modification of living
polyvinylferrocene chains was developed to introduce a suitable functional
group for the intended “grafting onto” approach. Grafted
particles were characterized by using TEM, SEM/energy dispersive X-ray
spectroscopy (EDS), XPS, small-angle X-ray scattering (SAXS), dynamic
light scattering (DLS), and cyclic voltammetry, revealing both the
presence of redox-responsive polymers and the presence of Grubbs catalyst
in the particle exterior. Chemical oxidation protocols for immobilized
polymers were applied to deactivate surface-attached catalysts in
ROMP protocols, while chemical in situ reduction
immediately led to catalyst’s reactivation.
A new design concept combines conjugated TPPA and AIE-active TPE units in an electroactive/fluorescent polymer with excellent properties: high fluorescence and on/off rates, superior cycling and long-term switching stability and fast response speed.
A novel electroluminescent poly(p-phenylenevinylene) (PPV) derivative was synthesized via the Gilch route, which emits in the blue-greenish region. The required monomer synthesis is a multistep process starting from catechol and does not involve any critical step. The polymer synthesis itself proceeds via standard Gilch conditions and results in constitutionally homogeneous and extraordinary high-molecular-weight PPVs. The characterization of these materials was carried out using nuclear magnetic resonance spectroscopy and size exclusion chromatography measurements. The highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels were estimated by combining information provided by cyclic voltammetry and UV−vis measurements. Finally, the electroluminescent behavior of the polymer was confirmed in an organic light-emitting diode.
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