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Heavy-ion-beam irradiation effect of poly(vinylidene fluoride) films; Chemical structures and reactivity in latent tracks

Yamaki, Tetsuya; Koshikawa, Hiroshi; Asano, Masaharu; Maekawa, Yasunari; Severin, D.*; Seidl, T.*; Trautmann, C.*

There has been a strong motivation for us to investigate the detailed chemistry of heavy-ion-induced degradation. We report here the results of our first experiments in this regard done at the newly installed M-branch of UNILAC accelerator, GSI. Commercially-available 25 $$mu$$m-thick PVDF films were irradiated at room temperature by 4.8 MeV/u $$^{238}$$U at fluencies of up to 6$$times$$10$$^{11}$$ ions/cm$$^{2}$$. This irradiation was performed in the multi-purpose chamber of the M3 beamline equipped with a Fourier-transform infrared (FT-IR) transmission spectrometer as well as a residual gas analyzer. When irradiated at a fluence of 1$$times$$10$$^{10}$$ ions/cm$$^{2}$$, the film showed three new absorption bands, which can be identified as in-chain and chain-end unsaturations in the PVDF main chain. According to the analysis of outgassing fragments, hydrogen fluoride can be predicted as degradation product for the formation of these unsaturated bonds.

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