کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5201445 | 1502894 | 2015 | 7 صفحه PDF | دانلود رایگان |
Foils of the aliphatic polymer polyvinyl acetate (PVAc) were exposed to swift heavy ion beam irradiation with Xenon, Gold, and Uranium ions with kinetic energies up to 2 GeV, corresponding to transferred energies dE/dx between 8 and 18 MeV/μm, with different fluences between 1 Ã 109 and 1 Ã 1012 ions/cm2 at room temperature. The ion induced chemical changes were studied by in-situ Fourier-transform Infrared Spectroscopy and Quadrupole Mass Spectrometry. Apart from a general reduction of the IR absorption bands, showing the degradation of the polymer by side chain scission, the appearance of a new band, assigned to the CO2 group, was observed. Volatile molecular fragments of various species from H2 up to CO2 lead to a considerable mass loss of the polymer. The structural changes lead to a reduction in the thermal stability of the residual polymer. The results are technically relevant for use of the material in space applications and particle accelerators.
Journal: Polymer Degradation and Stability - Volume 119, September 2015, Pages 132-138