Why Are There No Perfluorosiloxanes?

There are fluorocarbons, but they only have a little fluorine in
them, attached to carbon-based groups attached to the
siloxane backbone. These materials aren't much different
than regular silicone, except they cost more and emit a toxic
gas if you get them too hot. Why are there no polymers
which consist of a siloxane backbone with a fluorine at every
available site (i.e. replacing the methyl groups in PDMS).
It seems to me that this material, if possible, would have
amazing properties. It would be an elastomer which
should be stable indefinitely at 500 degrees C or even
Reply to
Mark Thorson
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