The use of 19F NMR for new structure determination in the radiolysis of FEP

K. K. Gleason, D. J.T. Hill, K. K.S. Lau, S. Mohajerani, A. K. Whittaker

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14 Scopus citations


The radiation chemistry of poly(tetrafluoroethylene-co-perfluoropropylene), FEP, with a mole fraction of tetrafluoroethylene, TFE, of 0.90 has been studied under vacuum using 60Co γ-radiation over absorbed dose ranges up to 3.0 MGy. The radiolysis temperatures were 300, 363, 423 and 523 K. New structure formation in the copolymers was analyzed by solid-state 19F NMR. The new structures formed in the copolymers have been identified and the G-values for the formation of new -CF3 groups was 2.2 at the lower temperatures and increased to 2.9 at 523 K. The G-value for the loss of original -CF3 groups was ≈1.0 at all temperatures. At the lower temperatures there was a net loss of -CF- groups on irradiation; G(CF) of -1.3, -0.9 and -0.5 at 300, 363 and 423 K, respectively, but at 523 K there was a net gain with G(CF) equal to 0.8.

Original languageEnglish (US)
Pages (from-to)83-87
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Issue number1-4
StatePublished - Dec 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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