Depth-dependent positron annihilation in different polymers

•Depth-dependent positron annihilation was conducted in different virgin polymers.•Variations of S parameter with incident positron energy was observed.•Different variation behavior of S parameter was explained. Depth-dependent positron annihilation Doppler broadening measurements were conducted for...

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Bibliographic Details
Published in:Applied surface science 2013-09, Vol.280, p.109-112
Main Authors: Yang, J., Zhang, P., Cheng, G.D., Li, D.X., Wu, H.B., Li, Z.X., Cao, X.Z., Jia, Q.J., Yu, R.S., Wang, B.Y.
Format: Article
Language:English
Subjects:
Atomic electronegativity
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Constants
Cross-disciplinary physics: materials science
rheology
Doppler broadening
ETFE
Exact sciences and technology
Implantation
Physics
Polyethylenes
Polymer
Polytetrafluoroethylenes
Positron annihilation
Positrons
S parameters
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Summary:•Depth-dependent positron annihilation was conducted in different virgin polymers.•Variations of S parameter with incident positron energy was observed.•Different variation behavior of S parameter was explained. Depth-dependent positron annihilation Doppler broadening measurements were conducted for polymers with different chemical compositions. Variations of the S parameter with respect to incident positron energy were observed. For pure hydrocarbons PP, HDPE and oxygen-containing polymer PC, S parameter rises with increasing positron implantation depth. While for PI and fluoropolymers like PTFE, ETFE and PVF, S parameter decreases with higher positron energy. For chlorine-containing polymer PVDC, S parameter remains nearly constant at all incident positron energies. It is suggested that these three variation trends are resulted from a competitive effect between the depth-dependent positronium formation and the influence of highly electronegative atoms on positron annihilation characteristics.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2013.04.104