Tetrafluoroethylene


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tetrafluoroethylene

[¦te·trə¦flu̇r·ō′eth·ə‚lēn]
(organic chemistry)
F2C:CF2 A flammable, colorless, heavy gas, insoluble in water, boils at 78°C; used as a monomer to make polytetrafluoroethylene polymers, for example, Teflon. Abbreviated TFE.

Tetrafluoroethylene

 

(also called perfluoroethylene), CF2=CF2, a colorless, odorless gas insoluble in water but soluble in organic solvents. Its boiling point is –76.3°C.

Tetrafluoroethylene has all the characteristic properties of fluorinated olefins, and it readily polymerizes and copolymerizes with many monomers—for example, vinylidene fluoride, hexafluoropropylene, trifluorochlorethylene, and ethylene. It is produced industrially by the pyrolysis of chlorodifluoromethane, CF2ClH, at 650°–800°C and at atmospheric pressure and is stored in steel tanks in the presence of polymerization inhibitors, such as tertiary amines. It forms explosive mixtures with air in concentrations of 13.4–46.4 percent by volume. It is slightly toxic; its maximum permissible concentration in air is 20 mg/m3.

Tetrafluoroethylene is mainly used in the production of polytetrafluoroethylene. Some of its copolymers are elastomers.

References in periodicals archive ?
and El-Nesr, E.M., 2000, "Radiation- induced Grafting of Styrene onto Poly(tetrafluoroethylene) (PTFE) Films.
He and his associates found that a frozen, compressed sample of tetrafluoroethylene had polymerized into a solid and formed polytetrafluoroethylene (PTFE) or Teflon.
Using a technique called chemical vapor deposition, the researchers coated the top of each carbon nanotube with poly(tetrafluoroethylene), otherwise known as Teflon.
It was tetrafluoroethylene (PTFE), which Dr Plunkett abbreviated to Teflon.
The fluoroplastic includes linear tetrafluoroethylene telomer as a main body that contains from six to 14 carbon atoms.
The Scotchgard products being withdrawn are electrochemical fluorination (ECF) chemistry-based, while DuPont Teflon and other fluoroprotectant formulas use a process called tetrafluoroethylene (TFE) telomerization, according to DuPont.
The apparatus, a hollow aluminum sphere with a 2-m dia, is lined with highly reflective poly(tetrafluoroethylene) and distributes UV radiation uniformly into 32 external specimen chambers.
Or that the only acceptable organic coating in a heated food contact zone is a polymerized tetrafluoroethylene? Did you know that screws, bolts, and rivet heads are, in most instances, not allowed in the food zone?
Recommended valve materials are alloy 20 or tetrafluoroethylene (TFE), 150-lb MSS flanged plug, gate, and ball valves with TFE sleeves, seats, and packing.
Aflas fluoroelastomers are copolymers of tetrafluoroethylene and propylene with high molecular weights, which give products made with them unique properties over conventional FKM-type fluoroelastomers.
"The size, the shape, the access, the heights, the timeline, the changing conditions in different parts of the roof not many parameters are easy on this one."<br />Bluemedia was awarded a $3.2 million contract to darken the ETFE (ethylene tetrafluoroethylene) roof structure.
performed admicellar polymerization of tetrafluoroethylene in perfluorocarbon admicelles on alumina in a nitrogen-purged reactor [38].