New Polymer Coatings Prevent Corrosion, Even When Scratched

New Polymer Coatings Prevent Corrosion, Even When Scratched

New Polymer Coatings Prevent Corrosion, Even When Scratched
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New Polymer Coatings Prevent Corrosion, Even When
Scratched
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Imagine tiny cracks in your patio table healing by themselves, or the first
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small scratch on your new car disappearing by itself. This and more may be
possible with self-healing coatings being developed at the University of
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Illinois.
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The new coatings are designed to better protect materials from the effects of
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environmental exposure. Applications range from automotive paints and marine
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varnishes to the thick, rubbery coatings on patio furniture and park benches.
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“Starting from our earlier work on self-healing
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national polymer
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technology in Ohio
coatings - adhesives composites
www.nationalpolymerlabs.com
materials at the U. of I., we have now created
self-healing coatings that automatically repair
themselves and prevent corrosion of the
underlying substrate,” said Paul Braun, a
University Scholar and professor of materials
science and engineering. Braun is corresponding
author of a paper accepted for publication in the
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...mehr zu:
> automotive paints
> Coating > Corrosion
> environmental exposure
> Laboratory > marine
varnishes > new car
disappearing by itself > New
Polymer Coatings > patio
furniture and park benches
> Polymer > rubbery
coatings > Scratched
> self-healing coatings
journal Advanced Materials, and posted on its Web
site.
To make self-repairing coatings, the researchers
first encapsulate a catalyst into spheres less than
100 microns in diameter (a micron is 1 millionth of
a meter). They also encapsulate a healing agent
into similarly sized microcapsules. The
microcapsules are then dispersed within the
desired coating material and applied to the
substrate.
“By encapsulating both the catalyst and the healing
agent, we have created a dual capsule system that
can be added to virtually any liquid coating
material,” said Braun, who also is affiliated with the
university’s Beckman Institute, Frederick Seitz Materials Research Laboratory,
department of chemistry, and Micro and Nanotechnology Laboratory.
When the coating is scratched, some of the capsules break open, spilling their
contents into the damaged region. The catalyst and healing agent react, repairing
the damage within minutes or hours, depending upon environmental conditions.
The performance of the self-healing coating system was evaluated through
corrosion testing of damaged and healed coated steel samples compared to control
samples that contained no healing agents in the coating.
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Reproducible damage was induced by scratching through the 100-micron-thick
polymer coating and into the steel substrate using a razor blade. The samples were
then immersed in a salt solution and compared over time.
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The control samples corroded within 24 hours and exhibited extensive rust
formation, most prevalently within the groove of the scratched regions, but also
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2/6/09 10:26 AM
New Polymer Coatings Prevent Corrosion, Even When Scratched
http://www.innovations-report.de/html/berichte/verfahrenstechnologi...
contrast, the self-healing samples showed no visual evidence of corrosion even
after 120 hours of exposure.
“Our dual capsule healing system offers a general approach to self-healing
coatings that operates across a broad spectrum of coating chemistries,” Braun said.
“The microcapsule motif also provides a delivery mechanism for corrosion
inhibitors, antimicrobial agents, and other functional chemicals.”
With Braun, the paper’s co-authors are U. of I. aerospace engineering professor
and Beckman researcher Scott White, and former Beckman and materials science
graduate student Soo Hyoun Cho. A company formed by Braun, White and other U.
of I. researchers is exploring commercialization of the self-healing coatings
technology.
The work was funded by Northrop Grumman Ship Systems, the U.S. Air Force Office
of Scientific Research, and the Beckman Institute.
James E. Kloeppel | Quelle: University of Illinois
Weitere Informationen: www.illinois.edu
Weitere Berichte zu: automotive paints > Coating > Corrosion
> environmental exposure > Laboratory > marine varnishes > new car
disappearing by itself > New Polymer Coatings > patio furniture and park
benches > Polymer > rubbery coatings > Scratched > self-healing coatings
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