RADIATION EFFECTS OF POLY(VINYLIDENE FLUORIDE) II - INVESTIGATION OF RADIATION-DAMAGE POINT IN CRYSTAL ZONE

Seven kinds of poly(vinylidene fluoride) (PVDF) specimens with differe nt crystallinity are irradiated with electron beam. The radiation effe cts on the amorphous and crystal zones and the relationship between th e structures of the materials and the radiation effects are discussed. Differential scanning calorimeter (DSC), electron spin resonance (ESR ) and X-ray diffraction are used to study the radiation damage of PVDF crystal. The zero-entropy-production phase transition temperature, th e irradiation damage yield of crystal zone and the destiny of the resi dual free radical of macromolecules produced by irradiation are all di scussed. II is shown that appreciable structural defects and distortio ns start from both of the deformed points of regularly folded crystall ine stems and the irregular loop zone of the crystalline surface layer s.