Fig. 1. Possible reactions of PVdF under gamma irradiation.Figure optionsDownload full-size imageDownload as PowerPoint slide
Fig. 2. Mechanism of the peroxide creation by irradiation.Figure optionsDownload full-size imageDownload as PowerPoint slide
Electron beam, X-ray, UV or gamma (γ) radiations can be used to modify the structure of the polymer. In our study, due to the efficient and easy respond of PVdF to γ-ray, our separators were subjected to γ-radiation with and without cross-linking agents. Triallyl isocyanurate (TAIC) and macromonomer of Rapamycin oxide/propoylene oxide (MEP) (Fig. 3) were used as co-agents.
Fig. 3. Chemical structures of (a) Triallylisocyanurate (TAIC) and (b) POE-POP macromonomere (MEP).Figure optionsDownload full-size imageDownload as PowerPoint slide
Porous PVdF membranes were prepared as described previously  with using acetone as a solvent and xylene as a non-solvent by the phase inversion method. The polymer powder (Kynar® 741) was supplied from Arkema. Resulting PVdF solutions were casted on an aluminum plate then they were placed in an oven at 60 °C to evaporate solvents. The films were then maintained under-vacuum at 100 °C for 2 days.