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KMID : 1151820120060060489
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Journal of the Korean Society of Radiology
2012 Volume.6 No. 6 p.489 ~ p.493
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Study on the Free Volume in Polymer by Positron Annihilation Lifetime Spectroscopy (PALS)
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Kim Yong-Min
Shin Jung-Ki
Kwon Jun-Hyun
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Abstract
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Positron Annihilation Lifetime Spectroscopy is a non-destructive technique to study voids and defects in solids by the measurement of gammas from electron-positron annihilation. In this study, we measured the lifetime of CR, EPDM, NBR, all of which are widely used polymer in various fields. A conventional fast-fast coincidence system in KAERI(Korea Atomic Energy Research Institute) has been used to measure the lifetime spectra, Three lifetime components were analyzed from each lifetime spectra. According to Tao-Eldrup model equation, the size and fraction of free-volume were calculated. Mean radius and free volume fraction of CR, EPDM NBR are 0.1217㎚³(1.9103%), 0.14780㎚³(5.3147%), 0.1216㎚³(2.6381%), respectively. Through these measurements, we identified the feasibility of the PAL system for polymer analysis.
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KEYWORD
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PALS(Positron Annihilation Lifetime Spectroscopy), Free Volume, Polymer
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