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 ?
g] copolymer of tetrafluoroethylene and perfluoro-4-trifluoromethoxy-1,3-dioxole in the ratio 40/60 (AD60), (8, 9) and with two different low [T.
The chemical structure of Aflas PM-1100 and PM- 3000 is derived from tetrafluoroethylene and perfluoroalkyl vinyl ether, which is said to offer superior resistance to chemicals, oils and solvents.
Patent 9,096,701 (August 4, 2015), "Aqueous Tetrafluoroethylene Polymer Dispersion, Process for Producing the Same, Tetrafluoroethylene Polymer Powder, and Molded Tetrafluoroethylene Polymer," Nobuhiko Tsuda, Yoshinori Nanba, Yasuhiko Sawada, and Tetsuo Shimizu (Daikin Industries, LTD.
The primer is comprised of at least one binder resin including at least one functional group selected from the group consisting of amide and amine functional groups; and at least one fluoropolymer resin being a copolymer of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride, said copolymer having a melting point above about 160[degrees]C, the copolymer further comprising five percent to 30% by weight of vinylidene fluoride and being capable of reacting with at least one of the amide and amine functional groups of the binder resin.
George Lin, technical manager, says Neoflon EPA SP-100 and SP-120 are copolymers of tetrafluoroethylene (TFE) and hexafluoropropylene, supplied in pellet form for extrusion and injection molding.
It combines a double O-ring sealed packing follower with low-friction tetrafluoroethylene (TFE)-based packing materials for reliable, long-term service that complies with low-emissions standards.
The chemical structure of Aflas PM-1100 and PM-3000 is derived from tetrafluoroethylene and perfluoroalkyl vinyl ether, which is said to offer superior resistance to chemicals, oils and solvents.
The fluorinated group and electrolyte monomers may be parts of the same polymer, as in Nation, which contains tetrafluoroethylene and perfluorovinyl ethers terminating in sulfonic groups.
In addition, because tetrafluoroethylene copolymers obtained by the incorporation of several comonomers exhibit extremely fast crystallization rates [9], their spherulites generally cannot be observed until they are sufficiently large.
7) investigated the wettability of the smooth and rough surfaces of three different materials: tetrafluoroethylene (TFE), gold, and hexamethyldisiloxane (HMDSO).
In addition, pneumatically pre-tensioned ethylene tetrafluoroethylene (ETFE) film or sheeting offers a number of design possibilities at relatively low cost.
Polymers such as perfluoroalkoxy copolymer, a copolymer of tetrafluoroethylene and perfluoro(alkyl vinyl ether), and fluorinated ethylene propylene, a copolymer of hexafluoropropylene and tetrafluoroethylene, have found only limited use in blow-molding applications because of low melt strength.