Thursday 22 May 2014

Materials that heal themselves

Many industries today, from medical to aviation, are conducting
researches on self-healing materials. While the results for metals
and ceramic haven’t been great, carbon based materials in the
form of polymers show very promising results. If they are used as
a cover or a layer, they close cracks and scratches in other
materials; they heal themselves and then repair the material in
which they are embedded. They thus transport metals, in the form
of micro capsules, to the area of the crack (see previous page),
break open there and release the metal from their shell. They also
serve as a protective shield: if due to an external disturbance, they
are broken into individual molecules, the self-healing polymers
merge back – either via hydrogen bonds or ionic interactions. The
prerequisite for this is that the molecule chains at the area of crack
remain free to move and that they are not too wide apart.
Self-healing polymers such as Polyrotaxane (see right) have
been in use as surface protection for a couple of years now. The
latest example is the G Flex smartphone from LG. The flexible
casing is encased in a protective layer, which makes small
scratches, which have probably been caused by a bunch of keys,
disappear within minutes. This process is triggered by heat, so all
one needs to do is rub one’s fingers over the scratch. But LG has
kept mum about the actual chemical process behind this. Perhaps
the material is based on the SeRM Super Polymer A1000
manufactured by the Japanese company Advanced Softmaterials.
Nissan have been using this material for a few years in the scratchproof paint it uses for its cars.

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