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- W2017185318 abstract "Irradiation of polymer samples using an accelerated beam of He++ ions passed through a 10 μm thick window of Havar foil has been performed. Such an irradiation simulates the effects of large α radiation doses on a vastly reduced time-scale. The experimental set up was designed so that the irradiated materials were contained within a small sample chamber. This chamber was isolated from the main vacuum chamber of the ion beam by means of the Havar foil window. A mass spectrometer linked directly to the sample chamber was used to analyse gaseous products evolved from the materials under irradiation. Samples of a material in which the polymer phase was an ethylenevinylacetate/polyvinylalcohol composite material indicated increased CO2 and CO evolution upon irradiation. This material, however, evolved a considerable amount of volatiles even without irradiation and so a detailed mechanistic interpretation of the results is not possible. A foamed poly(siloxane) material evolved a number of volatile species upon irradiation and possible chemical degradation mechanisms are commented upon. The sample was extremely resistant to radiation induced degradation as measured by volatile evolution though, so again a detailed mechanistic analysis is not possible. Samples of a polyester based polyurethane evolved CO2, CO and a number of high mass volatile species. Assignment of chemical structures to the main molecular ions allows deductions about the chemistry underlying radiation induced change to be made. Furthermore, identification of trends in volatile production allows information about potential degradation mechanisms to be deduced. To assess the contribution of sample heating on volatile evolution a series of pyrolysis experiments were performed. These indicate no evolution of volatiles below 100 °C and evolution of volatiles possessing masses of greater than 50 amu only at temperature of above 300 °C." @default.
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- W2017185318 date "2004-02-01" @default.
- W2017185318 modified "2023-10-01" @default.
- W2017185318 title "Volatile evolution from polymer materials induced by irradiation with He++ ions and comparative pyrolysis experiments" @default.
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- W2017185318 doi "https://doi.org/10.1016/j.nimb.2003.08.032" @default.
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