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Fluorine-Containing Polymers

  • J. P. Critchley
  • G. J. Knight
  • W. W. Wright

Abstract

The synthesis of fluorine-containing polymers and their development as possible heat-resistant materials has been largely prompted by the very high thermal stability of polytetrafluoroethylene (PTFE), whose preparation was first reported in a patent dated 1941.1 The thermal stability of PTFE has been attributed to the high carbon-fluorine bond strength (487 kJ/mole in CF4 compared with 418 kJ/ mole for C-H bonds in CH4)2 and to the shielding effect that the highly electronegative fluorine atoms have on the carbon backbone. The commercial introduction of PTFE was followed in the early 1950s by that of polychlorotrifluoroethylene, and in the 1960s by that of polyvinylidene fluoride and polyvinyl fluoride. A thermoplastic copolymer is also available based upon tetrafluoroethylene and hexafluoropropene. Copolymer formulations have been especially productive in giving elastomers, and the following combinations are the basis of commercial products: vinylidene fluoride/chlorotrifluoroethylene, vinylidene fluoride/hexafluoropropene, vinylidene fluoride/hexafluoropropene/ tetrafluoroethylene, propene/tetrafluoroethylene, pentafluoropropene/tetrafluoroethylene, perfluoromethylvinylether/tetrafluoroethylene. An hepta-fluorobutylacrylate-based elastomer has also been made. It will be noted that all the polymers so far mentioned are produced by vinylic addition reactions. Condensation polymers—polyhexafluoropentylene adipate and polyhexafluoropentylene adipate/isophthalate—were marketed by the Hooker Electrochemical Company, but only for a short time and only in development quantities.

Keywords

Polyvinylidene Fluoride Emulsion Polymerization Hydrogen Fluoride Flexural Modulus Vinylidene Fluoride 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1983

Authors and Affiliations

  • J. P. Critchley
    • 1
  • G. J. Knight
    • 1
  • W. W. Wright
    • 1
  1. 1.Royal Aircraft EstablishmentFarnboroughEngland

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