vinyl ether) is a widely known monomer used in the industrial scale,
particularly, in the production of fluorine containing rubbers. The
known values of copolymerization constants of perfluoro(methyl vinyl
ether) (?1) with tetrafluoroethylene2 (?2) are r1 = k11/k12 = 0.22
and r2 = k22/k21 = 1.42 (index 2 concerns tetrafluoroethylene).
vinyl ether as the special fluoric monomer has wide applications in
the development of new-style fluoro plastics and fluoro rubber with
excellent integrative properties.
pumping environments can be problematic for pump engineers. On the
one hand it's impossible to design the pump to be resistant to every
kind of chemical, while on the other, the tendency is to either over
specify a perfluoroelastomer to cover all eventualities or select a
elastomer with mid-range chemical resistance in the hope this will
cover most applications.
- There are five
main types of FKMs, determined by the types of monomers used to
produce the fluoroelastomer. These include Vinylidene Fluoride
(VF2), Hexafluoropropylene (HFP), Tetrafluoroethylene (TFE),
perfluorocarbon base polymer shall contain no less than 40
weight-percent of polymer units derived from tetrafluoroethylene, no
less than 40 weight-percent of polymer units derived from
perfluoromethyl vinyl ether and no more than 5 weight-percent
polymer units derived from perfluoro-2-phenoxy-propyl vinyl ether.
- Small amount of
perfluoromethyl vinyl ether copolymerize with tetrafluoroethylene to
produce fluoro resin, which could be melting processed.
- The polymer film
was prepared by the evaporation of the perfluoro(methyl vinyl ether)
polymer in the FC75 solvent on the ?Br glass, the film thickness
being 15 µm.
Perfluoroelastomers and fluoroelastomers are widely used as seals in
PV cell manufacturing equipments due to their extraordinary
resistance to chemicals and heat.
- The key monomer
that has historically been used for extending the low temperature
performance of FKM has been perfluoromethylvinylether (PMVE). The
replacement of hexafluoropropylene (HFP) by PMVE enabled FKM
materials to be developed with glass transition temperatures in the
region of -30°C.
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