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Nanotechnikum |
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Martin-Luther-Universität
Interdisziplinäres Zentrum für Materialwissenschaften
Nanotechnikum Weinberg
Heinrich-Damerow-Str. 4, D-06120 Halle, Germany
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J. Bartos, H. Svajdlenkova, M. Lukesova, Y. Yu, R. Krause-Rehberg
Molecular dynamics and free volume in organic glass-formers: A series of oligomer and polymer 1,4-poly (isoprene)
Chem. Phys. Lett. 602 (2014), 28-33
We present a combined study of the rotational dynamics and free volume in a series of 1,4 -poly(isoprene)s using ESR and PALS, respectively. The spectral parameter of mobility of the spin probe TEMPO is related to the annihilation of the ortho-positronium (o-Ps) probe. The o-Ps lifetime rules are valid independent of chain length and moreover, the T coincides with the bend effect at Tb1L. Finally, the new finding is that the first acceleration at Tx1 slow agrees with a change in the o-Ps lifetime width parameter below the glass transition temperature.
Keywords: lifetime; polymers; positron annihilation; simulation; electron paramagnetic resonance
DOI 10.1016/j.cplett.2014.04.006
© Elesevier 2014
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