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Investigations on Low Temperature Transitions and Time Effects of Branched Polyethylene by the Positron Lifetime Technique

P. Kindl, G. Reiter. phys. stat. sol. (a) 104, 707 (1987)

Abstract

Positron lifetime measurements are performed in branched polyethylene in the temperature range between -195 and +40 °C. The lifetime spectra are r esolved into four components, and corresponding annihilation mechanisms are discussed. Within the temperature range mentioned above four different transitions at -1 45, -95, -58, and -13 °C can be observed. From the behaviour of the lifetime parameters of the longest-lived component it is possible to deduce a criterion for the glass t ransition, which is situated at -13 °C. Additionally, time effects of the lifetime parameters are detected.

 

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