Abstract
Wide and small angle X-ray diffraction methods were used to study the structural changes in polyethylene, polyvinyl fluoride, polytrifluoroethylene, and also in the vinylidene fluoride-tetrafluoroethylene and tetrafluoroethylene-ethylene copolymers after exposure to 100–1500 Mrad doses of γ- 60Co radiation. The radiation resistance of crystalline and macromolecular structures was found to decrease as the number of fluorine atoms increased in the polymers. All the polymers used (except polyvinyl fluoride) showed a phase transition due to chain defects when they were irradiated; this led to a larger symmetry of the unit cell. The differing behaviour of block and powder samples of H containing polyfluoroethylenes during irradiation was found to diminish with increasing content of fluorine atoms. In addition to the existence of different mechanisms of structural change in the latter polymers there were some characteristics of the polyvinyl fluoride which are explained here.
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