Carbon Black--polyethylene Composites Studied by Positron Annihilation

• Authors: M. Dębowska , J. Rudzińska-Girulska , A. Pasternak , R. Poźniak
• Languages of publication: EN

Abstracts

EN

Preliminary results of positron annihilation lifetime measurements, performed for carbon black-LDPE composites with three kinds of carbon black (PRINTEX XE2, VULCAN XC-72, and SAKAP 6) are presented. Four components with lifetimes τ_{1}≈ 120 ps, τ_{2}≈340 ps, τ_{3}≈1.2 ns, τ_{4}≈2.8 ns occurred to be the best fitted to measured positron lifetime spectra. The presence of carbon black resulted only in reduction of intensities of the components with the lifetimes τ_{1}, τ_{3}, τ_{4} (originating in our opinion from the annihilation of the positronium) and increase in the intensity of the component with the lifetime τ_{2}. The intensities depend both on the content of carbon black and its kind as well. The strongest influence of the carbon black of the highest specific surface area (PRINTEX XE2) has been observed at the intensities which correlate well with the results of studies of resistivity and tensile strength for the same samples.

Keywords

EN

71.60.+z; 78.70.Bj; 82.30.Hk

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 71.60.+z: Positron states(for positron annihilation, see 78.70.Bj)
• 82.30.Hk: Chemical exchanges (substitution, atom transfer, abstraction, disproportionation, and group exchange)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1999
• Volume: 95
• Issue: 4
• Pages: 509-514

Dates

published

1999-04

Contributors

author

M. Dębowska

• Institute of Experimental Physics, Wrocław University, Pl. M. Borna 9, 50-204 Wrocław, Poland

author

J. Rudzińska-Girulska

• Institute of Experimental Physics, Wrocław University, Pl. M. Borna 9, 50-204 Wrocław, Poland

author

A. Pasternak

• Institute of Organic and Polymer Technology, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

author

R. Poźniak

• Institute of Organic and Polymer Technology, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

Identifiers

DOI

10.12693/APhysPolA.95.509