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Decomposition and CO2 evolution of an aliphatic polymer under bombardment with high energy heavy ions

Hossain, U. H. and Ensinger, Wolfgang (2015):
Decomposition and CO2 evolution of an aliphatic polymer under bombardment with high energy heavy ions.
119, In: Polymer Degradation and Stability, pp. 132-138. ISSN 0141-3910,
[Article]

Abstract

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 x 10^9 and 1 x 10^12 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.

Item Type: Article
Erschienen: 2015
Creators: Hossain, U. H. and Ensinger, Wolfgang
Title: Decomposition and CO2 evolution of an aliphatic polymer under bombardment with high energy heavy ions
Language: English
Abstract:

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 x 10^9 and 1 x 10^12 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 or Publication Title: Polymer Degradation and Stability
Volume: 119
Uncontrolled Keywords: Heavy ion irradiation, In-situ FT-IR spectroscopy, In-situ mass spectrometry, Polyvinyl acetate, Radiation damage, Thermo gravimetric analysis
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences
Date Deposited: 08 Jun 2015 06:45
Official URL: http://www.sciencedirect.com/science/article/pii/S0141391015...
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