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2006 | 110 | 5 | 593-604
Article title

Relationship between Enhanced Positronium Formation and Enhanced Positron Trapping in Polymers at Low Temperature

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EN
Abstracts
EN
Positron annihilation lifetime spectroscopy is used for investigation of low-density polyethylene and ethylene-methyl methacrylate copolymers of 1.45, 3.0, and 5.4 mole% of methyl methacrylate. The lifetime spectra are collected at 30 K, one by one, as a function of elapsed time. In the computer analysis a new theoretical model is developed, which enables separating the annihilation from positron free state, its trapped state and bound state in positronium. The positron trapping rateμ and the enhanced positronium formation rateκ are determined. The calculated values of μ andκ turned out to be linearly correlated. This correlation presumably originates from an influence of trapped electrons on the trapping of positrons. The dependences ofκ on measurement time are determined for low-density polyethylene and ethylene-methyl methacrylate of different methyl methacrylate content. A theoretical model describing quantitatively the dependences is proposed. The model considers the processes of electron-ion recombination, electron trapping, and electron scavenging by dipolar carbonyl groups supplied by methyl methacrylate additives.
Keywords
EN
Year
Volume
110
Issue
5
Pages
593-604
Physical description
Dates
published
2006-11
received
2006-06-05
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv110n506kz
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