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Gamma irradiation of polytetrafluoroethylene in chlorine
Author(s) -
Florin R. E.,
Wall L. A.
Publication year - 1963
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760030409
Subject(s) - tetrafluoroethylene , ultimate tensile strength , hexafluoropropylene , elongation , polytetrafluoroethylene , materials science , crystallinity , chlorine , composite material , irradiation , diffusion , copolymer , polymer chemistry , polymer , metallurgy , physics , thermodynamics , nuclear physics
Films of polytetrafluoroethylene, irradiated in halogen atmospheres, decrease in ultimate tensile strength and elongation at break almost as rapidly as in oxygen. The rate of degradation is approximately independent of chlorine pressure down to about 1 mm Hg. The phenomena can be explained semi‐quantitatively in terms of first order, cage reactions of scission, recombination, and reaction with chlorine, complicated by diffusion at low pressures. However, all reaction and diffusion parameters must shift with gradual increase of crystallinity. For a given decrease of elongation at break, polytetrafluoroethylene irradiated in a vacuum retains a relatively higher ultimate tensile strength. In the copolymer of tetrafluoroethylene and hexafluoropropylene, the changes in ultimate tensile strength and elongation at break are much slower under all conditions. Both polytetrafluoroethylene and the copolymer retain appreciable tensile strength but little elongation up to a dose of 2 x 10 8 r.