Positron annihilation study on free volume of amino acid modified,starch-grafted acrylamide copolymer |
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| Institution: | 1. School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, Nanjing Normal University, Nanjing 210023, China;2. College of the Environment and Ecology, Jiangsu Open University, Nanjing 210036, China;3. Department of Chemistry, University of California, Riverside, CA 92521, USA;1. Chemistry and Chemical Engineering College, Northeast Petroleum University, Daqing 163000, PR China;2. School of Chemical Engineering and Technology and State Key Laboratory for Chemical Engineering, Tianjin University, Tianjin 300350, PR China |
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| Abstract: | 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 τ1 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. |
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