Positron Annihilation Lifetime in situ Study of Deformed Polyolefin Elastomers

K. Krzemień, J. Kansy and J.E. Frąckowiak Institute of Material Science, University of Silesia, Bankowa 12, 40-007 Katowice, Poland

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Received: 20 09 2004;

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 parametersτi and intensities Ii. The variations ofτ3 reflect three deformation regions, the elastic range, strain softening range, and plastic region.

DOI: 10.12693/APhysPolA.107.837 PACS numbers:78.70.Bj, 71.60.+z, 61.41.+e