Active protection coatings have been
developed to mitigate the
corrosion of metallic substrates. Most of the current active coatings
rely on the presence of responsive particles displaying the ability
to encapsulate and release corrosion inhibitors. As for any composite
material, a high concentration of particles can reduce the coating
integrity. We prepare coatings with polymer-inhibitor conjugates,
displaying acetal and immolative disulfide linkers that can release
inhibitors upon corrosion of the substrates. On the contrary to previous
conjugates, the release can be activated by not only a change in the
pH value but also a change in the electrochemical potential. The anticorrosion
performance of the dual-responsive polymer is higher than the corresponding
single-responsive polymers.
Controlling
the rate of hydrolysis of polymer conjugates is of
paramount importance for the timely and precise delivery of drugs,
corrosion inhibitors, healing agents, and phytosanitary products.
Thioether ester groups as cleavable linkages are interesting because
they can be easily synthesized via efficient thiol–ene reactions.
We demonstrate here that the hydrolysis rate and selectivity of thioether
ester groups can be tuned by several orders of magnitude by insertion
of substituent groups. Small molecules and polymers are prepared with
substituents, allowing for a long sustained and selective release
of active molecules such as corrosion inhibitors. This design is applied
for preparing coatings for metals which display an excellent anticorrosion
performance.
Hydrogels can be used in surgeries, which require a support material to maintain a correct anatomy. One major limitation is however the time required for the preparation of hydrogels in...
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