Abstract
F 19 magnetic resonance was observed on non-irradiated Teflon and irradiated one by deuterons. Irradiation caused considerable increase of line width and second moment above -75°C, where an abrupt narrowing of line width caused by the onset of the segmental motion of the molecules took place for both samples. This result suggests that there might exist in the irradiated Teflon some molecular structures disturbing the molecular motion, e.g., cross-linkings, double bonds, formation of ring etc. and/or increase of crystallinity by irradiation. A broad line component superimposed on a sharp absorption line observed in the original Teflon around -7°C faded out as a result of the irradiation. The energies and entropies of activation were computed from the line width data. The irradiation gave them the effects similar to those of curing in natural rubber.
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