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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.