Abstract: This paper covers the effects of γ-radiation on crystal transformations of Poly-(vinylidene fluoride)before and after drawing as well as during annealing process.The results show that the drawing results in a drastic increase in both crystallinityalong the meridian direction and β-form crystal content for the irradiated samples.When the drawn samples were irradiated under appropriate dose and then annealedat 140℃, transformation from β-form to a-form was subjected to an inhibition.The transformation mechanisms between the two types of crystals are discussed onthe basis of results of WAXD and DSC.

Key words: Poly(vinylidene fluoride), γ-Irradiation.Drawing, Annealing, Crystaltransformation