| 释义 |
ˌpolytetraˌfluoroˈethylene Chem.
Also -fluorethylene.
[f. poly- + tetrafluoroethylene.]
A highly crystalline resinous polymer of tetrafluoroethylene having the structure {b1}(CF2CF2)n{b1}, which is tough, resistant to chemicals, stable over a wide range of temperature, and widely used as a moulding material, esp. under the trade name Teflon; abbr. P.T.F.E. (s.v. P II. d).
1946Industr. & Engin. Chem. Sept. 877/1 Although pure polytetrafluoroethylene is white in color, frequently commercially fabricated articles are somewhat gray and speckled, apparently as a result of minute traces of contamination. 1951Electronic Engin. XXIII. 370 In order to obtain a smooth bearing, use has been made of polytetrafluoroethylene for the bearing surface. 1959Times Rev. Industry June 22/1 Gaskets of polytetrafluorethylene or Fluon have proved invaluable in difficult services, since this material is resistant to all ‘searching’ chemical reagents except molten sodium and gaseous fluorine. 1961Lancet 19 Aug. 410/1 Polytetrafluoroethylene (P.T.F.E., ‘Fluon’, ‘Teflon’) is at present the most suitable material for permanent cannulation. 1962Which? Aug. 255/1 There are two kinds of non-stick frying pans—those with a silicone finish and those with a plastic called polytetrafluoroethylene, or PTFE. 1975Sci. Amer. July 63/1 Non-metals such as..polytetrafluoroethylene and carbon-graphites are successful bearing materials because of their excellent resistance to scoring and corrosion. 1978J. Sherwood Limericks of Lachasse i. 8 The plant..made polytetrafluorethylene, a polymer with three times the density of polypropylene and enormously strong. |