Perfluoropolyesters, the molecules of which are composed of carbon, oxygen and fluorine atoms, are prepared in various ways.
Perfluoropolyethers, the molecules of which are composed of carbon, oxygen and fluorine atoms, are obtained in various ways: ionic polymerization of perfluorinated olefin oxide, photooxidative polymerization of perfluoroolefins, oxidative polymerization of perfluoroolefins in the presence of initiators.
PEFs are transparent, colorless, viscous liquids with very low volatility and high density.
The chemical nature of PEF (high bond strength С-О and C-F, spatial protection provided by fluorine atoms) determines the high stability of compounds, making them suitable for use in aggressive environments. The advantage of PEF over silicone oils is the absence of solid deposits during high-voltage sparking.
Application area
In electronics, PEFs can be used as electrically insulating liquids and coolants.
Low surface energy and high stability of PEF makes them an excellent protective material for stone, in particular, for easily destructible limestone, brick. Functional PEFs (acids, alcohols) give good results in this area. PEF penetrate the pores and prevent the penetration of water, thereby contributing to the preservation of structures.