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 ?
The Global and Chinese Ethylene Tetrafluoroethylene (ETFE) Industry Report 2014 is a professional and in-depth study on the current state of the global ETFE industry with a focus on the Chinese situation.
79, October 1989), melt rheology of Hostaflon TFM is modified for thermoplastic-like processing by "building in perfluoralkoxy side groups into the linear macromolecular chain of tetrafluoroethylene prepared by suspension polymerization.
In this study, the changes in the fine structure and lamella arrangement of the two-dimensional fluorinated films formed by tetrafluoroethylene copolymers upon drawing are investigated by using wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) methods.
In addition, pneumatically pre-tensioned ethylene tetrafluoroethylene (ETFE) film or sheeting offers a number of design possibilities at relatively low cost.
Figure 6 shows the same LDPE microhybrids sliding against tetrafluoroethylene TEPE surfaces.
The fluoropolymer is polytetrafluoroethylene or a copolymer of tetrafluoroethylene and at least one fluorinated copolymerizable monomer.
Perfluorinated elastomers, often referred to as FFKM or PFE, are copolymers of (primarily) tetrafluoroethylene (TFE) and perfluorinated vinyl ether (PFVE).
The second is FKM-B, a medium fluorine BpAF curable copolymer, composed of VF2, HFP and tetrafluoroethylene (TFE).
PVDF can copolymerize with many fluorinated alkene monomers, such as tetrafluoroethylene, chlorotrifluoroethylene, and hexafluoropropylene (HFP).
Co-radial Design: Each individual conductor is separately insulated with ethylene tetrafluoroethylene (ETFE) and then wound together in parallel into a single coil.
This polymer is produced from hexafluoropropylene, vinyli dene fluoride and tetrafluoroethylene and recommended by the manufacturer for molding and calendering applications.