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Positron Annihilation Lifetime in situ Study of Deformed Polyolefin Elastomers

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Krzemień K., Kansy J., Frąckowiak J.
Acta Physica Polonica A
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2005
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vol. 107
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issue 5
837-841
EN
The positron annihilation lifetime spectroscopy was used to investigate the free volume hole size of ethylene octane copolymers as a function of deformation in the range from 0 to 110% in steps of 10%. For each degree of deformation a series of 5-6 positron annihilation lifetime spectra was collected in situ. All spectra of a given series were analysed simultaneously. They were resolved into three exponential components, of lifetimes parametersτ_i and intensities I_i. The variations ofτ_3 reflect three deformation regions, the elastic range, strain softening range, and plastic region.
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