Positron annihilation study on free volume of amino acid modified, starch-grafted acrylamide copolymer

Free volume measurements using positron annihilation lifetime spectroscopy was performed for uncrosslinked and crosslinked starch-grafted polyacrylamide, and their modified amino acid samples including some of their iron(III) complexes. The measurements were performed at room temperature. The analys...

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Bibliographic Details
Published in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2006-05, Vol.75 (5), p.590-595
Main Authors: Mahmoud, K.R., Al-Sigeny, S., Sharshar, T., El-Hamshary, H.
Format: Article
Language:English
Subjects:
Mean free volume
Positron annihilation lifetime spectroscopy
Starch-graft polyacrylamide
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Summary:Free volume measurements using positron annihilation lifetime spectroscopy was performed for uncrosslinked and crosslinked starch-grafted polyacrylamide, and their modified amino acid samples including some of their iron(III) complexes. The measurements were performed at room temperature. The analysis of lifetime spectra yielded mostly three lifetime components. It was observed that the values of the short lifetime component τ 1 are slightly higher than the lifetime associated with the self-decay of para-positronium atoms in polymers. The free volume was probed using ortho-positronium pick-off annihilation lifetime parameters. The mean free volume has also been calculated from the lifetime data. The avrage value of this parameter of the crosslinked polymer were found to be higher than those of the uncrosslinked polymer.
ISSN:0969-806X
1879-0895
DOI:10.1016/j.radphyschem.2005.12.037